160 results on '"An, Jingjing"'
Search Results
2. Application of machine learning in prediction of Pb2+ adsorption of biochar prepared by tube furnace and fluidized bed
- Author
-
Huang, Wei, Wang, Liang, Zhu, JingJing, Dong, Lu, Hu, Hongyun, Yao, Hong, Wang, LinLing, and Lin, Zhong
- Published
- 2024
- Full Text
- View/download PDF
3. Effects of Membrane Covers and Biochar on Compost Quality and Greenhouse Gas Reduction in Aerobic Composting
- Author
-
Jie Cao, Haoli Qu, Ruirong Li, Pengjun Wang, Jingjing Fu, and Mingjiang Chen
- Subjects
membrane-covered ,biochar ,aerobic composting ,greenhouse gas ,Biotechnology ,TP248.13-248.65 - Abstract
The addition of biochar and the use of membrane coverings are two methods used in aerobic composting of agricultural waste. The effectiveness of each of these two methods on compost quality and reduction of greenhouse gas emissions was tested in the laboratory. The results showed that both methods increased the maximum composting temperature and extended the thermophilic period. The germination index of biochar-treated compost and membrane-covered compost reached 70% on the 18th day, which was 12 days earlier than the corresponding value in the control group. The products from the biochar-treated compost had higher pH and lower electrical conductivity, compared with the product of the control group, indicating that these products are more suitable for acidic soils. In terms of greenhouse gas reduction, both methods were found to reduce the emissions of CH4 and N2O from composting. The addition of biochar had a better emission reduction effect on N2O, whereas the membrane covering technique yielded a better effect on CH4 emission reduction. The results of this study provide technical support for managed aerobic composting to reduce greenhouse gas emissions.
- Published
- 2024
4. Preparation and Physicochemical Properties of Biochar from the Pyrolysis of Pruning Waste of Typical Fruit Tree in North China
- Author
-
Xuelei Liu, Xueyong Ren, Jiangchuang Dong, Bowei Wang, Jianli Gao, Ruijiang Wang, Jingjing Yao, and Wenbo Cao
- Subjects
fruit tree pruning waste ,pyrolysis ,biochar ,pore structure ,physical and chemical properties ,Biotechnology ,TP248.13-248.65 - Abstract
Routine maintenance of fruit trees generates a substantial quantity of pruning waste each year. This waste is potential feedstock for producing energy, materials, and other products. The feasibility of making biochar from the waste via pyrolysis was evaluated. The effects of seven tree species, different pruning sites, and temperature on the pyrolysis process, and the physicochemical properties of the biochar were studied. Pyrolysis of different tree species at 500 °C yielded 27.5 to 33.3% biochar, with a high calorific value (approximately 30 MJ/kg), low ash content (approximately 4%), and capturing up to 60% of the carbon element present. Simultaneously, when the temperature was increased from 400 to 700 °C, the yield of biochar decreased from 35.8% to 24.3%, but the properties improved with the higher heating value rising from 29.2 to 31.3 MJ/kg and the iodine value from 234 to 252 mg/g. The biochar has a good pore structure with a specific surface area of 237 m2/g, total pore volume of 0.175 cm3/g, and average pore size of 2.96 nm. In general, biochar from the pyrolysis of fruitwood pruning waste generated here could be an ideal feedstock to produce high-value-added products, such as solid fuels, activated carbon, and electrode materials.
- Published
- 2023
5. Sorption of Iodine on Biochar Derived from the Processing of Urban Sludge and Garden Waste at Different Pyrolysis Temperatures
- Author
-
Bing Bai, Qingyang Liu, He Li, Dan Liu, Haichao Wang, Chengliang Zhang, Zheng Yang, and Jingjing Yao
- Subjects
sludge waste ,garden waste ,biochar ,iodine ,Organic chemistry ,QD241-441 - Abstract
The United Nations proposed the Sustainable Development Goals with the aim to make human settlements in cities resilient and sustainable. The excessive discharge of urban waste including sludge and garden waste can pollute groundwater and lead to the emission of greenhouse gases (e.g., CH4). The proper recycling of urban waste is essential for responsible consumption and production, reducing environmental pollution and addressing climate change issues. This study aimed to prepare biochar with high adsorption amounts of iodine using urban sludge and peach wood from garden waste. The study was conducted to examine the variations in the mass ratio between urban sludge and peach wood (2/1, 1/1, and 1/2) as well as pyrolysis temperatures (300 °C, 500 °C, and 700 °C) on the carbon yield and adsorption capacities of biochar. Scanning electron microscopy, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectrometry, powder X-ray diffraction, and elemental analysis were used to characterize the biochar produced at different pyrolysis temperatures and mass ratios. The results indicate that the carbon yield of biochar was found to be the highest (>60%) at a pyrolysis temperature of 300 °C across different pyrolysis temperatures. The absorbed amounts of iodine in the aqueous solution ranged from 86 to 223 mg g−1 at a mass ratio of 1:1 between urban sludge and peach wood, which were comparably higher than those observed in other mass ratios. This study advances water treatment by offering a cost-effective method by using biochar derived from the processing of urban sludge and garden waste.
- Published
- 2024
- Full Text
- View/download PDF
6. Assessing the Efficiency and Mechanism of Copper Adsorption onto Biochars derived from Corn Straw and Cow Manure
- Author
-
Xu, Qiao, Xiong, Chuanqi, Fan, Jialu, Zhang, Feifan, Wang, Jingjing, Xu, Qiuyue, Yin, Weiqin, Wang, Shengsen, and Wang, Xiaozhi
- Published
- 2023
- Full Text
- View/download PDF
7. Nitrate-Nitrogen Adsorption Characteristics and Mechanisms of Various Garden Waste Biochars
- Author
-
Jingjing Yao, Zhiyi Wang, Mengfan Liu, Bing Bai, and Chengliang Zhang
- Subjects
nitrate-nitrogen ,garden waste ,biochar ,pyrolysis temperature ,NO3−–N removal efficiency ,Technology ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Microscopy ,QH201-278.5 ,Descriptive and experimental mechanics ,QC120-168.85 - Abstract
Nitrate-nitrogen (NO3−–N) removal and garden waste disposal are critical concerns in urban environmental protection. In this study, biochars were produced by pyrolyzing various garden waste materials, including grass clippings (GC), Rosa chinensis Jacq. branches (RC), Prunus persica branches (PP), Armeniaca vulgaris Lam. branches (AV), Morus alba Linn. sp. branches (MA), Platycladus orientalis (L.) Franco branches (PO), Pinus tabuliformis Carrière branches (PT), and Sophorajaponica Linn. branches (SL) at three different temperatures (300 °C, 500 °C, and 700 °C). These biochars, labeled as GC300, GC500, GC700, and so on., were then used to adsorb NO3−–N under various conditions, such as initial pH value, contact time, initial NO3−–N concentration, and biochar dosage. Kinetic data were analyzed by pseudo-first-order and pseudo-second-order kinetic models. The equilibrium adsorption data were evaluated by Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models. The results revealed that the biochar yields varied between 14.43% (PT700) and 47.09% (AV300) and were significantly influenced by the type of garden waste and decreased with increasing pyrolysis temperature, while the pH and ash content showed an opposite trend (p < 0.05). The efficiency of NO3−–N removal was significantly influenced by the type of feedstock, preparation process, and adsorption conditions. Higher pH values had a negative influence on NO3−–N adsorption, while longer contact time, higher initial concentration of NO3−–N, and increased biochar dosage positively affected NO3−–N adsorption. Most of the kinetic data were better fitted to the pseudo-second-order kinetic model (0.998 > R2 > 0.927). Positive b values obtained from the Temkin model indicated an exothermic process of NO3−–N adsorption. The Langmuir model provided better fits for more equilibrium adsorption data than the Freundlich model, with the maximum NO3−–N removal efficiency (62.11%) and adsorption capacity (1.339 mg·g−1) in PO700 under the conditions of pH = 2, biochar dosage = 50 mg·L−1, and a reaction time of 24 h. The outcomes of this study contribute valuable insights into garden waste disposal and NO3−–N removal from wastewater, providing a theoretical basis for sustainable environmental management practices.
- Published
- 2023
- Full Text
- View/download PDF
8. Facile Recycling of Waste Biomass for Preparation of Hierarchical Porous Carbon with High-Performance Electromagnetic Wave Absorption.
- Author
-
Zhou, Yihui, He, Jingjing, Hong, Jiafu, Xie, Haihe, and Lin, Xuexia
- Subjects
- *
ELECTROMAGNETIC wave absorption , *BIOCHAR , *WASTE recycling , *ELECTROMAGNETIC fields , *BIOMASS , *IMPEDANCE matching , *ELECTROMAGNETIC waves - Abstract
Hierarchical-porous-structured materials have been widely used in the field of electromagnetic wave (EMW) absorption, playing a critical role in minimizing EMW interference and pollution. High-quality EMW absorbers, characterized by a lower thickness, lighter weight, wider absorption band, and stronger absorption capacity, have been instrumental in reducing damage and preventing malfunctions in the automotive and aviation industries. The utilization of discarded nut shells through recycling can not only alleviate environmental problems but relieve resource constraints. Herein, a facile method for the preparation of hierarchical porous biomass carbon derived from abandoned Xanthoceras Sorbifolium Bunge Shell (XSS) biomass was developed for high-performance EMW absorption. The porous structures of XSS biochar were studied by using different levels of the K2CO3 activator and simple carbonization. The effect of K2CO3 on the EMW parameters, including the complex permittivity, complex permeability, polarization relaxation, and impedance matching, was analyzed. The best EMW absorption performance of the XSS biochar was observed at a mass ratio of activator-to-biomass of 2:1. A minimum reflection loss (RLmin) of −38.9 dB was achieved at 9.12 GHz, and a maximum effective absorption bandwidth (EABmax) of up to 3.28 GHz (14.72~18.0 GHz) could be obtained at a 1.8 mm thickness. These results demonstrated that hierarchical porous XSS carbon was prepared successfully. Simultaneously, the prepared XSS biochar was confirmed as a potential and powerfully attractive EMW-absorbing material. The proposal also provided a simple strategy for the development of a green, low-cost, and sustainable biochar as a lightweight high-performance absorbing material. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. Effects of tillage and biochar on soil physiochemical and microbial properties and its linkage with crop yield
- Author
-
Wenju Chen, Peipei Li, Fang Li, Jingjing Xi, and Yanlai Han
- Subjects
deep tillage ,biochar ,clayey soil ,physicochemical properties ,bacterial community structure ,redundancy analysis ,Microbiology ,QR1-502 - Abstract
Vertisols are clayey soils with a high potential for improving production. Therefore, understanding the impact of tillage and fertilization on soil physicochemical properties and microbial community is essential for improving the vertisols with a high montmorillonite and smectite clay content. A 3-year field experiment was conducted to compare the effects of different tillage and fertilization practices at three depths of the vertisol under the wheat–maize cropping system in the North China Plain. The experimental treatments included rotary tillage without fertilization (R-CK), rotary tillage with chemical nitrogen (N), phosphorus (P), and potassium (K) fertilization (R-NPK), R-NPK plus biochar (R-NPKB), deep tillage without fertilization (D-CK), deep tillage with chemical N, P, and K fertilization (D-NPK), and D-NPK plus biochar (D-NPKB). The results showed that D-NPKB significantly improved winter wheat and summer maize yields by 14.4 and 3.8%, respectively, compared with R-NPK. The nitrate (NO3––N) content of the deeper soil layer in D-NPKB was significantly higher than that in D-NPK. Meanwhile, biochar application increased the pH in the three layers. Compared with R-NPK, D-NPKB significantly increased the average content of available phosphorus (AP), soil organic carbon (SOC), and total nitrogen (TN) by 73.7, 18.5, and 19.0%, respectively. Meanwhile, Gaiellale, Sphingomonadaceae, and Nocardioidaceae were the predominant bacteria at the family level across all treatments, with a total relative proportion ranging from 14.1 to 23.6%. In addition, the abundance of Bacillaceae in deep tillage was 9.4% higher in the 20–30-cm soil layer than that in rotary tillage. Furthermore, the correlation analysis revealed a significant positive correlation between crop yield and chemical factors such as NO3––N and the abundances of Gaiellalea, Sphingomonadaceae, and Nocardioidaceae. The findings collectively indicated that deep tillage combined with biochar application could increase the soil nutrients and modify the bacterial structure in the deeper soil layer and therefore will be beneficial for improving the productivity of the vertisols.
- Published
- 2022
- Full Text
- View/download PDF
10. Ameliorating Effects of Biochar, Sheep Manure and Chicken Manure on Acidified Purple Soil
- Author
-
Jingjing Chen, Junfeng Yu, Zhongyi Li, Jia Zhou, and Linqing Zhan
- Subjects
purple soil ,soil acidification ,biochar ,livestock manure ,soil fertility ,Agriculture - Abstract
The proportion of acidic purple soils has increased. Consequently, an effective method for amelioration of acidic purple soils is urgently needed. A 40 day incubation experiment using apple tree biochar, fermented sheep manure and chicken manure was conducted to assess the effects of organic materials on the acidity and fertility of acidic purple soil. The results showed that application of organic materials increased soil pH and decreased soil-exchangeable acidity. All of the treatments increased soil-exchangeable and water-soluble base cations after incubation. Specifically, biochar increased soil pH and reduced exchangeable acidity more than the other two fermented manures, because biochar was rich in carbonates and other alkaline substances. The concentration of soil available K was significantly higher under biochar than manure addition, while the opposite was true for soil available P and N, with a higher increase in soil available P in the manure treatments. By evaluating the soil fertility using a fuzzy comprehensive method, it was found that the fermented livestock manure enhanced soil fertility more strongly than biochar. Considering the effectiveness of soil amendments and production cost, applying a large amount of fermented organic fertilizer is an effective approach to the amelioration of acidified purple soil.
- Published
- 2023
- Full Text
- View/download PDF
11. The Potential of Biochar as N Carrier to Recover N from Wastewater for Reuse in Planting Soil: Adsorption Capacity and Bioavailability Analysis
- Author
-
Yingliang Yu, Bei Yang, Evangelos Petropoulos, Jingjing Duan, Linzhang Yang, and Lihong Xue
- Subjects
biochar ,nitrogen carrier ,adsorption ,bioavailability ,agricultural wastewater ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Recovering nitrogen (N) from agricultural wastewater for reuse in planting fields is a more sustainable and economical strategy to limit N pollution than using conventional treatments. Hereby, regular biochar produced by wheat straw pyrolysis and Mg-modified biochar were used as the N carriers to assess inorganic-N adsorption from simulated agricultural wastewater and the potential for reuse of the carried N in a planting system. The results showed that biochar materials have different affinities towards inorganic-N types. The amount of biochar carried-N increased with the increase in inorganic-N concentration and reached 4.44 mg/g as the maximum. The biochar carried ~4 mg/g of inorganic N substituting nearly 40% of N fertilizer following a 1% w/w addition rate for vegetable planting. After a trial season, 34.7–42.7% of the carried N from biochar was assimilated by the plant, 45.9–53.7% was retained by the soil, and only about 10% was lost. In comparison to the condition with all N inputs from chemical fertilizer, the addition of part of N by the N–biochar matrix significantly reduced the N loss by improving the plant N uptake or increasing the N content in the soil. This study demonstrates that biochar materials could be used as N carriers to recover N from wastewater for reuse in soil, carrier stability, and bioavailability preservation.
- Published
- 2022
- Full Text
- View/download PDF
12. Application of machine learning in prediction of Pb2+ adsorption of biochar prepared by tube furnace and fluidized bed.
- Author
-
Huang, Wei, Wang, Liang, Zhu, JingJing, Dong, Lu, Hu, Hongyun, Yao, Hong, Wang, LinLing, and Lin, Zhong
- Subjects
BIOCHAR ,MACHINE learning ,ADSORPTION (Chemistry) ,FURNACES ,LEAD ,METAL refining ,RANDOM forest algorithms - Abstract
Data mining by machine learning (ML) has recently come into application in heavy metals purification from wastewater, especially in exploring lead removal by biochar that prepared using tube furnace (TF-C) and fluidized bed (FB-C) pyrolysis methods. In this study, six ML models including Random Forest Regression (RFR), Gradient Boosting Regression (GBR), Support Vector Regression (SVR), Kernel Ridge Regression (KRR), Extreme Gradient Boosting (XGB), and Light Gradient Boosting Machine (LGBM) were employed to predict lead adsorption based on a dataset of 1012 adsorption experiments, comprising 422 TF-C groups from our experiments and 590 FB-C groups from literatures. The XGB model showed superior accuracy and predictive performance for adsorption, achieving R
2 values for TF-C (0.992) and FB-C (0.981), respectively. Contrasting inferior results were observed in other models, including RF (0.962 and 0.961), GBR (0.987 and 0.975), SVR (0.839 and 0.763), KRR (0.817 and 0.881), and LGBM (0.975 and 0.868). Additionally, a hybrid dataset combining both biochars in Pb adsorption also indicated high accuracy (0.972) as obtained from XGB model. The investigation revealed that the influence of char characteristics and adsorption conditions on Pb adsorption differs between the two biochar. Specific char characteristics, particularly nitrogen content, significantly influence lead adsorption in both biochar. Interestingly, the influence of pyrolysis temperature (PT) on lead adsorption is found to be greater for TF-C than for FB-C. Consequently, careful consideration of PT is crucial when preparing TF-C biochar. These findings offer practical guidance for optimizing biochar preparation conditions during heavy metal removal from wastewater. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
13. Capacity and Mechanisms of Phosphate Adsorption on Lanthanum-Modified Dewatered Sludge-Based Biochar.
- Author
-
Mo, Jingjing, Li, Qian, Sun, Xiaojie, Zhang, Hongxia, Xing, Meiyan, Dong, Bin, and Zhu, Hongxiang
- Subjects
BIOCHAR ,ADSORPTION (Chemistry) ,ENDOTHERMIC reactions ,SEWAGE sludge ,ADSORPTION capacity ,WASTE management - Abstract
Using sewage sludge to produce biochar-based adsorbents to remove phosphate (P) from water can be a sustainable and cost-effective method of waste management. However, the adsorption efficiency of sewage sludge biochar is not high. In this study, lanthanum-modified sludge-based biochar (La-SBBC) was synthesized by combining lanthanum nitrate with dewatered sludge. La-SBBC exhibited the highest removal efficiency of 99.06% for an initial P concentration of 15 mg/L at pH 3.0 with a dosage of 1.3 g/L. The maximum adsorption capacity of La-SBBC for P was 152.77 mg/g at 35 °C. The adsorption process followed the pseudo-second-order kinetic model (R
2 ≥ 0.973) and the Freundlich isothermal adsorption model (R2 ≥ 0.928). Multilayer chemisorption was identified as the controlling process. The primary mechanisms of P adsorption by La-SBBC involved electrostatic interactions, precipitation, and inner sphere complexation. Thermodynamic analysis revealed that the adsorption process of La-SBBC was a spontaneous endothermic reaction. The fixed-bed experiment demonstrated that La-SBBC had significant practical utility. La-SBBC maintained 76.6% of the original P removal efficiency after six cycles. Therefore, La-SBBC can be used as a promising adsorbent for P in practical applications. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
14. Biochar combined with magnesium fertilizer improves cabbage (Brassica oleraceae L.) yield by modulating physicochemical characteristics and the bacterial community in acidic soil.
- Author
-
Li, Hongzhao, Yan, Tongbo, Fu, Tianhong, Hao, Yongzhou, Li, Jing, Tan, Yi, Li, Zhen, Peng, Yutao, Chen, Xiao, Chang, Jingjing, Song, Zhao, Yu, Min, Li, Xuewen, Li, Yalin, Song, Shiwei, and Zhang, Baige
- Subjects
ACID soils ,SUSTAINABLE agriculture ,BIOCHAR ,BACTERIAL communities ,FERTILIZERS ,MAGNESIUM alloys - Abstract
Biochar and magnesium (Mg) fertilizers have gained increasing attention in agriculture for their potential benefits. However, their combined effects on vegetable growth in southern acidic soils have not been fully elucidated. To address this issue, a study was conducted with six treatments all of which included a baseline amount of compound fertilizer (CK), an increased amount of compound fertilizer (F), Mg fertilizer (M), biochar (BC), biochar combined with Mg (BCM) and an increased amount of compound F with Mg (FM), to investigate their synergistic effects on soil physicochemical properties, enzyme activity, microorganisms and cabbage yield. The results of the study showed that compared with CK, the M, BC and BCM treatments all increased soil organic matter (SOM), exchangeable magnesium (Ex‐Mg), acid phosphatase (ACP) and yield, while the F treatment led to a 5% decrease in SOM. The BCM treatment significantly increased SOM, Ex‐Mg, ACP by 14%, 40%, and 25%, respectively. The most abundant phyla in BCM processing were Proteobacteria (21%), Chloroflexi (19%) and Actinomycetes (17%); the most abundant genera were Bacillus (8%). Further, the effect of BCM on crop growth promotion was better than that of FM, and the economic analysis showed that compared with FM, the benefit of BCM increased by 14%. Through structural equation modelling analysis, the synergistic increase in yield was because of the increase in soil TP, Ex‐Mg, NO3−–N and β‐GC caused by BCM, improving soil nutrients and microbial communities, thereby promoting cabbage growth. Therefore, the combined application of biochar and Mg in acidic soil could significantly improve soil fertility and crop productivity, while also reducing the need for costly chemical fertilizers, thereby offering a promising and cost‐effective approach for sustainable agriculture. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
15. Improving bifunctional catalytic activity of biochar via in-situ growth of nickel-iron hydroxide as cathodic catalyst for zinc-air batteries.
- Author
-
Zhang, Pengxiang, Sun, Kang, Liu, Yanyan, Zhou, Benji, Li, Shuqi, Zhou, Jingjing, Wang, Ao, Xie, Lixia, Li, Baojun, and Jiang, Jianchun
- Subjects
BIOCHAR ,CATALYTIC activity ,HYDROXIDES ,STORAGE batteries ,ENERGY conversion - Abstract
Expanding the application scenarios of wood-derived biochar guided by the conversion of traditional energy to new energy shows great promise as a field. As thrilling energy conversion apparatus, zinc-air batteries (ZABs) require cathode catalysts with high oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities and stability. Herein, two-dimensional nickel-iron hydroxide nanosheets were creatively assembled in N-doped wood-derived biochar (NiFe-LDH@NC) by an in-situ growth method. The categorized porous organization in wood-derived biochar facilitates the rapid seepage of electrolytes and rapid diffusion of reaction gases. The unique interfacial structure of biochar and NiFe-LDH accelerates electron transfer during oxygen electrocatalysis, and endows NiFe-LDH@NC with first-class catalytic activity and durability for ORR and OER. The ZAB derived from NiFe-LDH@NC showed elevated discharge productivity and cycle endurance, making it promising for viable applications. This work provided a convenient way for the conversion of wood-derived biochar to high-value added electrocatalysts. Article Highlights: Heteroatom-doped wood-derived biochar was assisted in situ growth of NiFe-LDH. NiFe-LDH@NC exhibited excellent bifunctional activity and stability toward ORR/OER. The ZAB achieved a peak power density of 123 mW cm
−2 and a cycling stability of 270 h. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
16. Nitrate-Nitrogen Adsorption Characteristics and Mechanisms of Various Garden Waste Biochars.
- Author
-
Yao, Jingjing, Wang, Zhiyi, Liu, Mengfan, Bai, Bing, and Zhang, Chengliang
- Subjects
- *
BIOCHAR , *ADSORPTION (Chemistry) , *ENVIRONMENTAL protection , *ADSORPTION capacity , *WASTE management , *ENVIRONMENTAL management - Abstract
Nitrate-nitrogen (NO3−–N) removal and garden waste disposal are critical concerns in urban environmental protection. In this study, biochars were produced by pyrolyzing various garden waste materials, including grass clippings (GC), Rosa chinensis Jacq. branches (RC), Prunus persica branches (PP), Armeniaca vulgaris Lam. branches (AV), Morus alba Linn. sp. branches (MA), Platycladus orientalis (L.) Franco branches (PO), Pinus tabuliformis Carrière branches (PT), and Sophorajaponica Linn. branches (SL) at three different temperatures (300 °C, 500 °C, and 700 °C). These biochars, labeled as GC300, GC500, GC700, and so on., were then used to adsorb NO3−–N under various conditions, such as initial pH value, contact time, initial NO3−–N concentration, and biochar dosage. Kinetic data were analyzed by pseudo-first-order and pseudo-second-order kinetic models. The equilibrium adsorption data were evaluated by Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models. The results revealed that the biochar yields varied between 14.43% (PT700) and 47.09% (AV300) and were significantly influenced by the type of garden waste and decreased with increasing pyrolysis temperature, while the pH and ash content showed an opposite trend (p < 0.05). The efficiency of NO3−–N removal was significantly influenced by the type of feedstock, preparation process, and adsorption conditions. Higher pH values had a negative influence on NO3−–N adsorption, while longer contact time, higher initial concentration of NO3−–N, and increased biochar dosage positively affected NO3−–N adsorption. Most of the kinetic data were better fitted to the pseudo-second-order kinetic model (0.998 > R2 > 0.927). Positive b values obtained from the Temkin model indicated an exothermic process of NO3−–N adsorption. The Langmuir model provided better fits for more equilibrium adsorption data than the Freundlich model, with the maximum NO3−–N removal efficiency (62.11%) and adsorption capacity (1.339 mg·g−1) in PO700 under the conditions of pH = 2, biochar dosage = 50 mg·L−1, and a reaction time of 24 h. The outcomes of this study contribute valuable insights into garden waste disposal and NO3−–N removal from wastewater, providing a theoretical basis for sustainable environmental management practices. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
17. The Effects of Pre-treatments and Low-temperature Pyrolysis on Surface Properties of Biochar from Sunflower Straw as Adsorption Material
- Author
-
Chunyan Zhang, Zhiheng Song, Hang Shi, Jingjing Fu, Yinhu Qiao, and Chunxia He
- Subjects
Low-temperature pyrolysis ,Pre-treated method ,Biochar ,Sunflower straw ,Adsorption ,Biotechnology ,TP248.13-248.65 - Abstract
Carbon adsorbent materials that were prepared from sunflower straw by a combination of pre-treatment and low-temperature pyrolysis showed better adsorption compared with untreated carbon. Four different pre-treatment agents (steam, alkali (KOH), phosphoric (H3PO4), and salt (ZnCl2)) were analyzed with respect to their effects on the maximum surface area and the micropore area. Samples were measured by thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), surface area analysis, and pore size analysis. The surface area, pore volume, and N2-adsorption capacity of the samples were closely correlated with the pre-treating agent. A biochar with a maximum surface area of 877.6 m2/g and a micropore area of 792.8 m2/g was prepared with phosphoric acid (H3PO4) as the pre-treatment agent at a temperature of 400 °C. The main result of the one-stage pre-treatment procedure was the number of micropores. The two-stage, low-temperature pyrolysis procedure focused on the volume of the pores. Carbonized sunflower straw, with pretreated and low-temperature pyrolysis procedures, was judged to be a highly effective and economic method to prepare carbon adsorbents.
- Published
- 2016
- Full Text
- View/download PDF
18. A biomass-derived biochar-supported NiS/C anode material for lithium-ion batteries
- Author
-
Jianguo Duan, Jiemeng Huang, Ding Wang, Yingjie Zhang, Jingjing He, Peng Dong, Yiyong Zhang, Guanghui Xia, Yang Gu, Ying Wang, Luzhi Liu, and Xuebao Li
- Subjects
010302 applied physics ,chemistry.chemical_classification ,Materials science ,Sulfide ,Process Chemistry and Technology ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Anode ,chemistry.chemical_compound ,Nickel ,chemistry ,Chemical engineering ,Amorphous carbon ,0103 physical sciences ,Biochar ,Materials Chemistry ,Ceramics and Composites ,Lithium ,0210 nano-technology ,Dissolution ,Polysulfide - Abstract
Nickel sulfides are perfect anode materials for high-capacity and low-cost lithium-ion batteries (LIBs); however, with the shortcoming of polysulfide intermediate dissolution, volume expansion exceeding the limit during cycling also restricts their development. Herein, NiS/C composite materials are successfully anchored on chestnut shell fluff (CSF)-derived biochar by a glucose-auxiliary hydrothermal method along with an annealing treatment. The CSF biochar acts as an effective electron transmission channel for the rapid lithiation/delithiation of NiS and as a fixed sulfur carrier for inhibiting the dissolution of polysulfide. Glucose restrains the accumulation of NiS particles and then transforms into uniform amorphous carbon during annealing, which is more effective in buffering for rapid volume variation. Moreover, the CSF-NiS/C electrode exhibits a remarkable specific capacity of 1522.8 mAh g-1 (0.1 A g-1) and distinguished rate performance with 295 mAh g-1 capacity (3 A g-1), which are better than those of the pure NiS/C anode material displays. Researchers may be inspired by both of these reasonable design and synthesis strategies that are beneficial for the development of high-performance nickel-based sulfide anode materials for LIBs.
- Published
- 2021
19. Ameliorating Effects of Biochar, Sheep Manure and Chicken Manure on Acidified Purple Soil.
- Author
-
Chen, Jingjing, Yu, Junfeng, Li, Zhongyi, Zhou, Jia, and Zhan, Linqing
- Subjects
- *
POULTRY manure , *BIOCHAR , *SOIL amendments , *ACID soils , *SOILS , *MANURES - Abstract
The proportion of acidic purple soils has increased. Consequently, an effective method for amelioration of acidic purple soils is urgently needed. A 40 day incubation experiment using apple tree biochar, fermented sheep manure and chicken manure was conducted to assess the effects of organic materials on the acidity and fertility of acidic purple soil. The results showed that application of organic materials increased soil pH and decreased soil-exchangeable acidity. All of the treatments increased soil-exchangeable and water-soluble base cations after incubation. Specifically, biochar increased soil pH and reduced exchangeable acidity more than the other two fermented manures, because biochar was rich in carbonates and other alkaline substances. The concentration of soil available K was significantly higher under biochar than manure addition, while the opposite was true for soil available P and N, with a higher increase in soil available P in the manure treatments. By evaluating the soil fertility using a fuzzy comprehensive method, it was found that the fermented livestock manure enhanced soil fertility more strongly than biochar. Considering the effectiveness of soil amendments and production cost, applying a large amount of fermented organic fertilizer is an effective approach to the amelioration of acidified purple soil. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
20. Bioremediation of Wastewater by Iron Oxide-Biochar Nanocomposites Loaded with Photosynthetic Bacteria
- Author
-
Shiying He, Linghao Zhong, Jingjing Duan, Yanfang Feng, Bei Yang, and Linzhang Yang
- Subjects
iron oxide nanoparticles ,nanocomposites ,microorganisms ,biochar ,nutrient removal ,water treatment ,Microbiology ,QR1-502 - Abstract
It has been reported that bacteria-mediated degradation of contaminants is a practical and innocuous wastewater treatment. In addition, iron oxide nanoparticles (NP) are wastewater remediation agents with great potentials due to their strong adsorption capacity, chemical inertness and superparamagnetism. Therefore, a combination of NPs and microbes could produce a very desirable alternative to conventional wastewater treatment. For this purpose, we first prepared Fe3O4/biochar nano-composites, followed by loading photosynthetic bacteria (PSB) onto them. It was found that Fe3O4/biochar nano-composites exhibited a high adsorption capacity for PSB (5.45 × 109 cells/g). The efficiency of wastewater pollutants removal by this PSB/Fe3O4/biochar agent was then analyzed. Our results indicated that when loaded onto Fe3O4/biochar nano-composites, PSB’s nutrient removal capability was significantly enhanced (P < 0.05). This agent removed 83.1% of chemical oxygen demand, 87.5% of NH4+, and 92.1% of PO43- from the wastewater in our study. Our experiments also demonstrated that such composites are outstanding recyclable agents. Their nutrient removal capability remained effective even after five cycles. In conclusion, we found the PSB/Fe3O4/biochar composites as a very promising material for bioremediation in the wastewater treatment.
- Published
- 2017
- Full Text
- View/download PDF
21. Contribution of nitrogen configurations to the adsorption of Cd(<scp>ii</scp>) in nitrogen-enriched biochar
- Author
-
Zhuozhi Ouyang, Yu Jiang, Weilin Huang, Qian Yao, Yurong Deng, Jingjing Yang, Zhi Dang, Liu Yanjun, and Chen Yang
- Subjects
Precipitation (chemistry) ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Interaction energy ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,Nitrogen ,Catalysis ,Metal ,Adsorption ,chemistry ,X-ray photoelectron spectroscopy ,visual_art ,Biochar ,Materials Chemistry ,visual_art.visual_art_medium ,0210 nano-technology ,Carbon ,0105 earth and related environmental sciences - Abstract
To clarify the function of the nitrogen-containing structures on the adsorption of heavy metals, nitrogen-enriched biochars (NBCs) mainly composed of pyrrolic, pyridinic, and graphitic nitrogen were prepared to investigate the interaction mechanism with Cd(II). The results of batch experiments revealed that the saturated Cd(II) adsorption capacities of Pr-NBC, Pd-NBC, and Gp-NBC were 12.68, 24.04, and 35.95 mg g−1 respectively. The strongest adsorption ability was found for the Gp-NBC and was ascribed to the enhancement of graphitic nitrogen. The results from SEM-EDS and XRD, and the zeta potentials for the materials revealed that carbonate precipitation, cation exchange, and electrostatic interactions contributed to the adsorption of Cd(II). XPS and FTIR demonstrated that nitrogen in the carbon framework might have promoted the adsorption by forming cation–π interactions between graphitic nitrogen and Cd(II). The electrostatic potential distribution of the nitrogen with different configurations fully confirmed this. The theoretical calculations also proved that graphitic nitrogen had the lowest interaction energy to Cd(II), which further verified the strong contribution of graphitic nitrogen to the adsorption of heavy metal. Nitrogen-enriched biochar effectively adsorbs, changes the migration process of heavy metals in the natural environment, and thus alleviates the current situation of heavy metal pollution.
- Published
- 2021
22. Effects of Silk-Worm Excrement Biochar Combined with Different Iron-Based Materials on the Speciation of Cadmium and Lead in Soil
- Author
-
Pengyang Bian, Jingjing Zhang, Chaolan Zhang, He Huang, Qun Rong, Haixia Wu, Xue Li, Mengmeng Xu, Yu Liu, and Siwei Ren
- Subjects
silkworm excrement ,biochar ,ferrous materials ,soil contamination ,stabilization ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
A 56d incubation experiment was conducted to explore the effects of the silk-worm excrement biochar (500 °C, BC) combined with different iron-based materials (FeCl3, FeSO4, and reduced iron powder) on the speciation of cadmium (Cd) and lead (Pb) in a contaminated soil. Application rate of BC and iron-based materials is 1% (W/W) and 0.2% (W/W) of the soil, respectively. At the same time, the soil physicochemical properties, such as pH, cation exchange capacity (CEC), and the structure of soil, were determined in order to explore the influence mechanism of amendments to forms of Cd and Pb in soil. The results show that the stabilization effects on Cd is (BC + FeSO4) > (BC + FeCl3) > (BC + Fe) > (BC) and Pb is (BC + Fe) > (BC + FeSO4) > (BC + FeCl3) > (BC) at the end of incubation, compared with the effect of the control group. The treatment of (BC + FeSO4) is the most effective in terms of the stabilization of Cd and Pb, which makes the percentages of organic-bound and residual Cd and Pb increase by 40.90% and 23.51% respectively. In addition, with different ways of treatment, the pH value and CEC of soil see a remarkable increase by 1.65–2.01 units and 2.01–2.58 cmol·kg−1 respectively. X-ray diffraction (XRD) patterns show that the soil imprisons Cd and Pb in different mineral phases. As such the treatment of (BC + FeSO4) can significantly improve soil environment, increase soil pH value & CEC and exert a relatively good stabilization effect on both Cd and Pb.
- Published
- 2018
- Full Text
- View/download PDF
23. The Potential of Biochar as N Carrier to Recover N from Wastewater for Reuse in Planting Soil: Adsorption Capacity and Bioavailability Analysis.
- Author
-
Yu, Yingliang, Yang, Bei, Petropoulos, Evangelos, Duan, Jingjing, Yang, Linzhang, and Xue, Lihong
- Subjects
SOIL absorption & adsorption ,ADSORPTION capacity ,SEWAGE ,BIOAVAILABILITY ,BIOCHAR ,WHEAT straw - Abstract
Recovering nitrogen (N) from agricultural wastewater for reuse in planting fields is a more sustainable and economical strategy to limit N pollution than using conventional treatments. Hereby, regular biochar produced by wheat straw pyrolysis and Mg-modified biochar were used as the N carriers to assess inorganic-N adsorption from simulated agricultural wastewater and the potential for reuse of the carried N in a planting system. The results showed that biochar materials have different affinities towards inorganic-N types. The amount of biochar carried-N increased with the increase in inorganic-N concentration and reached 4.44 mg/g as the maximum. The biochar carried ~4 mg/g of inorganic N substituting nearly 40% of N fertilizer following a 1% w/w addition rate for vegetable planting. After a trial season, 34.7–42.7% of the carried N from biochar was assimilated by the plant, 45.9–53.7% was retained by the soil, and only about 10% was lost. In comparison to the condition with all N inputs from chemical fertilizer, the addition of part of N by the N–biochar matrix significantly reduced the N loss by improving the plant N uptake or increasing the N content in the soil. This study demonstrates that biochar materials could be used as N carriers to recover N from wastewater for reuse in soil, carrier stability, and bioavailability preservation. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
24. The production of rice straw-derived biochar and its application for enhanced decolorization of azo dye as the role of redox mediator
- Author
-
Cong Ding, Tianyin Huang, Jingjing Yang, Wei Wu, Liming Zhang, Wenjun Xia, and Jiabin Chen
- Subjects
Chemistry ,Biochar ,Rice straw ,Redox mediator ,Nuclear chemistry - Published
- 2020
25. Enhanced sludge dewatering via homogeneous and heterogeneous Fenton reactions initiated by Fe-rich biochar derived from sludge
- Author
-
Jingjing Qiu, Keke Xiao, Sha Liang, Bingchuan Liu, Wenbo Yu, Shuangyi Tao, Jingping Hu, Huijie Hou, Huali Deng, and Jiakuan Yang
- Subjects
Chemistry ,General Chemical Engineering ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Reuse ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,01 natural sciences ,Dewatering ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Catalysis ,Homogeneous ,visual_art ,Biochar ,visual_art.visual_art_medium ,Environmental Chemistry ,Sewage sludge treatment ,0210 nano-technology ,Charcoal ,Carbon - Abstract
Fenton and Fenton-like sludge conditioning processes have been studied intensively due to their superior efficiency in improving sludge dewaterability. But these processes inevitably produce a large quantity of Fe-rich sludge cake that induces challenges for disposal. Herein a sustainable sludge recycling strategy has been developed by using sludge-derived Fe-rich biochar as an iron source and catalyst to enhance sludge dewatering via advanced oxidation processes. Both homogeneous Fenton reactions initiated by the leached Fe2+ from the biochar, and heterogeneous Fenton reactions initiated by the bonded iron, in forms of Fe3O4, on the surface of the biochar, are revealed to contribute to the increase the amount of OH generation during sludge conditioning, which further improved the release of bound water and sludge dewaterability. The stability of the dewatering performance using the new strategy is demonstrated via three consecutive reuse cycles, in which a stable water contents of dewatered sludge cakes of approximately 46.38 wt% ± 2.88 is obtained. The iron content of the biochar becomes stable after the 2nd round recycle. A reduction of 28.39% on the total operating cost of sludge treatment could be realized when compared with the Fenton conditioning system without sludge recycling. The proposed sustainable sludge recycling strategy could realize zero disposal Fe-containing sludge, and meanwhile produce biochar that can be beneficially reused as valuable functional materials for other applications.
- Published
- 2019
26. High-value utilization of mask and heavy fraction of bio-oil: From hazardous waste to biochar, bio-oil, and graphene films
- Author
-
Zejun Luo, Jingjing Deng, Ke Gong, Xifeng Zhu, and Xiefei Zhu
- Subjects
Hazardous Waste ,Environmental Engineering ,Materials science ,Hot Temperature ,Health, Toxicology and Mutagenesis ,Fraction (chemistry) ,Chemical vapor deposition ,Raw material ,law.invention ,Hazardous waste ,law ,Biochar ,Environmental Chemistry ,Humans ,Plant Oils ,Waste Management and Disposal ,Ecosystem ,Graphene ,SARS-CoV-2 ,Anthracite ,COVID-19 ,Polyphenols ,Pulp and paper industry ,Pollution ,Biofuels ,Charcoal ,Heat of combustion ,Graphite - Abstract
At present, it is very common to wear mask outdoors in order to avoid coronavirus disease 19 (COVID-19) infection. However, this leads to the formation of numerous plastic wastes that threaten humans and ecosystem. Against this major background, a novel co-pyrolysis coupled chemical vapor deposition (CVD) strategy is proposed to systematically convert mask and heavy fraction of bio-oil (HB) into biochar, bio-oil, and three-dimensional graphene films (3DGFs) is proposed. The biochar exhibits high higher heating value (HHV) (33.22-33.75 MJ/kg) and low ash content (2.34%), which is obviously superior to that of the walnut shell and anthracite coal. The bio-oil contains rich aromatic components, such as 1,2-dimethylbenzene and 2-methylnaphthalene, which can be used as chemical feedstock for insecticides. Furthermore, the 3DGF800 has a wide range of applications in the fields of oil spill cleanup and oil/water separation according to its fire resistance, high absorbability (40-89 g g-1) and long-term cycling stability. This research sheds new light on converting plastic wastes and industrial by-products into high added-value chemicals.
- Published
- 2021
27. Fabrication of porous biochar decorated with MnFe2O4 magnetic nanoparticle for high effective removal of Cr(VI) ion in solution.
- Author
-
Jingjing Han, Renrong Liu, Huifang Wang, Muqing Qiu, and Baowei Hu
- Subjects
BIOCHAR ,CHEMICAL stability ,PRECIPITATION (Chemistry) ,IONS ,HEAVY metals - Abstract
Heavy metals posed a very important treat to public health and environment because of their toxicity, bioaccumulation and biodegradability properties. The development of high efficiency, low cost and good chemical stability adsorbents for removing heavy metals from aqueous solution was very urgent. The removal capacity of Cr(VI) by the preparation of porous biochar decorated with MnFe
2 O4 magnetic nanoparticle (MnFe2 O4 @PS) was evaluated. Results showed that the operational parameters had an important influence on Cr(VI) removal. Pseudo-second-order model and Langmuir model could be used to describe the adsorption process. The adsorption process of Cr(VI) by MnFe2 O4 @PS composites was a spontaneous, endothermic and randomness process. The removal capacity of Cr(VI) by MnFe2 O4 @PS composites reached 46.51 mg/g. The main mechanisms contained electrostatic interaction, Surface adsorption, surface complexation and chemical precipitation. MnFe2 O4 @PS composites exhibited high removal capacity of Cr(VI), good chemical stability and recyclability. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
28. Pyrite/biochar-activated peroxymonosulfate strengthens tetracycline degradation: Important roles of surface functional groups and Fe(Ⅱ)/Fe(Ⅲ) redox cycling.
- Author
-
Fang, Jieru, He, Fang, Yan, Zelong, Wang, Jingjing, Yu, Rui, and Zhou, Haihong
- Subjects
BIOCHAR ,FUNCTIONAL groups ,PEROXYMONOSULFATE ,WOOD waste ,TETRACYCLINE ,OXIDATION-reduction reaction ,REACTIVE oxygen species - Abstract
Nonradical species with high anti-interfering properties have shown significant advantages in complex wastewater treatment. Herein, a pyrite/biochar catalyst (FBC) was prepared using pine sawdust biochar (BC) as a support material loaded with pyrite (FeS 2). It exhibited high activity and stability in the FBC/PMS system for effective activation of peroxymonosulfate (PMS) to degrade tetracycline (TC) over a wide pH range (3.0–9.0). According to the characterization and analysis data, a variety of oxygen-containing functional groups (C O, -OH) and Fe and S active sites on the FBC surface assisted in PMS decomposition to produce reactive oxygen species (ROS). The mechanism study showed that the redox cycling of Fe(Ⅱ)/Fe(Ⅲ) and the electron-transfer medium of the BC oxygen functional groups contributed to the formation of SO 4
•- , •OH, O 2•- ,1 O 2 and FeⅣ =O, but1 O 2 was the main active oxidant. The potential pathways for TC degradation were suggested, and the toxicity of by-products was predicted by toxicity evaluation. Furthermore, FBC/PMS system exhibited minimal sensitivity to interference of concomitant materials. Overall, this study provided a reference for the application of green advanced oxidation technology of iron-based mineral composites to treat pharmaceutical contaminants in real water. [Display omitted] • FBC exhibited good catalytic activity for PMS over a wide pH range of 3.0-9.0. • The functional groups (C=O, -OH) and Fe, S sites on the surface of FBC played crucial roles in the activation of PMS. • TC was degraded in the FBC/PMS system by the synergistic action of SO 4•- , •OH,1 O 2 , FeIV =O and electron transfer pathways. • The FBC/PMS system exhibited good anti-interference ability and reusability. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
29. Anchoring Al- and/or Mg-oxides to magnetic biochars for Co-uptake of arsenate and fluoride from water
- Author
-
Meng Yang, Jingjing Fu, Jie Jin, Ziyi Shen, and Feihu Li
- Subjects
Environmental Engineering ,0208 environmental biotechnology ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Water Purification ,chemistry.chemical_compound ,Fluorides ,Adsorption ,Specific surface area ,Biochar ,Water environment ,Waste Management and Disposal ,Arsenic ,0105 earth and related environmental sciences ,Magnetic Phenomena ,Arsenate ,Water ,General Medicine ,020801 environmental engineering ,Kinetics ,chemistry ,Charcoal ,Arsenates ,Magnesium Oxide ,Pyrolysis ,Fluoride ,Water Pollutants, Chemical ,Nuclear chemistry ,Aluminum - Abstract
The co-occurrence of arsenic and fluoride in the water environment has led to many health concerns for living beings. Simultaneous removal of such ions is crucial to the safety of water resources, and biochar has been extensively engaged to address this issue. Here four magnetic biochars (mBCs) including pristine magnetic biochar and three aluminum (Al) and/or magnesium (Mg) oxides-anchored magnetic biochar (i.e., Al-mBC, Mg-mBC, and MgAl-mBC) were prepared via a facile pyrolysis method and then comprehensively evaluated as adsorbents for enhanced co-uptake of arsenate (AsV) and fluoride (F−) from synthetic water. The mBC shows a high specific surface area of 205 m2 g−1, which dropped to 116, 80, and 114 m2 g−1 upon the anchoring of Al, Mg, and Mg + Al, respectively. Our results suggest that the adsorption of either AsV or F− is highly pH-dependent, and pH 4–6 is the optimal range for maximum adsorption. The adsorption isotherm data indicate that the MgAl-mBC adsorbent outranks all other mBCs for co-uptake of both AsV and F−. The adsorption capacity maxima of MgAl-mBC are 34.45, and 21.59 mg g−1 for AsV and F−, respectively (pH = 5, T = 10 °C), also highly outstripping other biochars reported in the literature. The magnetic feature of these mBCs enables us to fast reclaim and regenerate the exhausted adsorbents by an external magnet and dilute NaOH. The Al- and Mg-anchored mBCs are expected to be used as highly efficient adsorbents for environmental remediation of waters contaminated by both AsV and F−.
- Published
- 2021
30. Impact of biochar-induced vertical mobilization of dissolved organic matter, sulfamethazine and antibiotic resistance genes variation in a soil-plant system
- Author
-
Hongyan Guo, Jingxian Zhang, Muhammad Nafees, Jingjing Wu, Wenchao Du, Ying Yin, Yuan Qian, and Linlin Qiu
- Subjects
Environmental Engineering ,Health, Toxicology and Mutagenesis ,0211 other engineering and technologies ,Amendment ,02 engineering and technology ,010501 environmental sciences ,complex mixtures ,01 natural sciences ,Soil ,Dissolved organic carbon ,Biochar ,Environmental Chemistry ,Humans ,Leaching (agriculture) ,Waste Management and Disposal ,0105 earth and related environmental sciences ,021110 strategic, defence & security studies ,Mobilization ,Sorption ,Drug Resistance, Microbial ,Sulfamethazine ,Pollution ,Environmental chemistry ,Charcoal ,Environmental science ,Groundwater ,Antibiotic resistance genes - Abstract
The migration risk of antibiotic and antibiotic resistance genes (ARGs) have attracted lots of attentions due to their potential threaten to public health. Strategies to reduce their vertical mobilization risk are urgently required for groundwater safety and human health. Biochar enjoys numerous interests due to its excellent sorption affinity. However, little was known about the efficacy of biochar amendment in impeding the vertical mobilization of antibiotic and ARGs. To fill this gap, a column study was carried out to investigate biochar-induced variations in the leaching behavior of dissolved organic matter (DOM), sulfamethazine (SMZ) and ARGs. Results showed that biochar addition enhanced DOM export from soil, changed its composition and impeded the vertical transport of SMZ. Biochar amendment could effectively decrease the occurrence of extracellular and intracellular sul2 in soil and impede its vertical transportation, however, it did not work out with sul1 gene. Structural equation modeling analysis demonstrated that the abundance of sul2 was significantly controlled by SMZ concentration, while the primary drivers of sul1 were SMZ concentration and DOM content. These results indicated the failure in inhibiting the vertical transfer of sul1 under biochar amendment and highlighted the important role of DOM in the leaching of soil ARGs.
- Published
- 2021
31. Highly efficient removal of aqueous Hg2+ and CH3Hg+ by selective modification of biochar with 3-mercaptopropyltrimethoxysilane
- Author
-
Jingchun Tang, Yao Huang, Jingjing Lyu, and Siyu Xia
- Subjects
chemistry.chemical_classification ,Langmuir ,Aqueous solution ,Chemistry ,General Chemical Engineering ,Langmuir adsorption model ,Sorption ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,symbols.namesake ,Adsorption ,Biochar ,symbols ,Environmental Chemistry ,Humic acid ,0210 nano-technology ,Pyrolysis ,Nuclear chemistry - Abstract
Biochars pyrolyzed at different temperatures were thiol-modified using 3-mercaptopropyltrimethoxysilane (3-MPTS) and applied on aqueous Hg2+ and CH3Hg+ removal with high efficiencies. The structure and physicochemical properties of biochar before and after thiol-modification were characterized. The biochar pyrolyzed at low temperature had more active sites ( OH, C O, C O C, and π bond) for surface modification with 3-MPTS. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well with the sorption data. Among all the raw and thiol-modified biochars, 3BS (thiol-modified biochar from pyrolysis at 300 °C) had the largest Langmuir adsorption capacities of Hg2+ (126.62 mg/g) and CH3Hg+ (60.76 mg/g). The introduction of SH enhanced the selectivity of biochar for mercury sorption (especially CH3Hg+). Ligand exchange and complexation between surface active sites ( SH, OH, COOH, and NH2) and mercury were the dominant removal mechanisms. Among them, SH played a major role. With the increase of 3-MPTS content in the preparation of 3BS, the adsorption capacity of Hg2+ and CH3Hg+ increased first and then decreased (the optimal content of 3-MPTS was 2%). Natural organic matter (NOM), glucose and humic acid (0–24 mg/L) had little effect on the adsorption of Hg2+ and CH3Hg+ by 3BS (the mercury removal rate only changed by 1.2–9.4%). This study demonstrates potential of thiol-modified biochar for mercury (especially CH3Hg+) removal from water.
- Published
- 2019
32. Application of biochar in a CIC reactor to relieve ammonia nitrogen stress and promote microbial community during food waste treatment
- Author
-
Chengyuan Su, Liming Liao, Lijian Zhao, Menglin Chen, Yuxiang Lu, Jingjing Qin, Qiujin Deng, and Zhi Huang
- Subjects
biology ,Renewable Energy, Sustainability and the Environment ,Chemistry ,020209 energy ,Strategy and Management ,05 social sciences ,Chemical oxygen demand ,02 engineering and technology ,Building and Construction ,biology.organism_classification ,Industrial and Manufacturing Engineering ,Coenzyme F420 ,Anaerobic digestion ,chemistry.chemical_compound ,Food waste ,Extracellular polymeric substance ,Methanoculleus ,Microbial population biology ,Environmental chemistry ,Biochar ,050501 criminology ,0202 electrical engineering, electronic engineering, information engineering ,0505 law ,General Environmental Science - Abstract
Ammonia nitrogen inhibition is a well-known issue in the anaerobic digestion of food waste. This study aims to investigate the influence of biochar on the performance and the microbial community structure of a controlling internal circulation (CIC) reactor for food waste treatment in presence of 1500 mg/L of ammonia nitrogen. When ammonia nitrogen concentration increased to 1500 mg/L in the influent, chemical oxygen demand (COD) removal efficiency was reduced to 76%, the fluorescence peaks of aromatic proteins disappeared, and the intensity of coenzyme F420 was reduced in the three-dimensional excitation emission matrix (3D-EEM) spectra of soluble microbial products (SMP) and tightly-bound extracellular polymeric substances (TB-EPS). The band intensity at 1635 cm−1, attributed to the C=O stretching vibrations, reduced, and the broad band values of 3400 cm−1 implied a sharp peak of the amino group in the fourier transform infrared (FTIR) spectra of TB-EPS. In the CIC reactor, COD removal efficiency reached to about 90% with biochar. High-throughput sequencing revealed that the abundance of Clostridiales, Lactobacillales and Methanoculleus increased, while the abundance of Syntrophomonas decreased at high ammonia nitrogen concentrations. In presence of biochar, the abundance of Methanoregulaceae, Bacteroidales, Anaerolineales, and Syntrophobacterales increased. It was concluded that biochar addition could alleviate the inhibitory effect of high ammonia nitrogen concentration.
- Published
- 2019
33. Adsorption characteristics of tetracycline on biochar from agricultural wastes
- Author
-
Shanshan Li, Zhihua Liu, Yue Jiang, Yingjie Dai, Yue Sun, Zhihua Liu Wu Yue, Jingjing Li, Mei Liu, and Wu Yue
- Subjects
Adsorption ,Agriculture ,business.industry ,Chemistry ,Tetracycline ,Environmental chemistry ,Biochar ,medicine ,business ,medicine.drug - Published
- 2019
34. Nitrogen-doped biochar as peroxymonosulfate activator to degrade 2,4-dichlorophenol: Preparation, properties and structure–activity relationship
- Author
-
Deng Yurong, Wang Jinling, Zhao Qing, Yang Chen, Li Hong, Dang Zhi, and Yang Jingjing
- Subjects
Quenching ,Environmental Engineering ,Nitrogen ,Health, Toxicology and Mutagenesis ,2,4-Dichlorophenol ,Conductivity ,Pollution ,Peroxides ,Catalysis ,Structure-Activity Relationship ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Charcoal ,Biochar ,Environmental Chemistry ,Degradation (geology) ,Reactivity (chemistry) ,Waste Management and Disposal ,Pyrolysis ,Chlorophenols - Abstract
Nitrogen-doped biochar (NCMs) has shown great potential as metal-free catalysts for persulfates. To understand the evolution law of properties of NCMs with preparation conditions, eleven NCMs were prepared and characterized by EA, BET, Raman, XPS, and conductivity. Surface area and conductivity can be improved by higher pyrolysis temperature and longer retention time. Distribution of nitrogen species of NCMs was greatly influenced by pyrolysis temperature. Subsequently, these NCMs were applied to activate peroxymonosulfate to degrade 2,4-dichlorophenol. A linear correlation of the initial apparent degradation rate constant (kobs) of 2,4-dichlorophenol with conductivity and ratio of graphitic N was newly established, revealing that conductivity and graphitic N of NCMs would be the key property deciding degradation efficiency of 2,4-dichlorophenol. Positive effect of conductivity can be ascribed to the mediated electron-transfer mechanism. Electron-transfer mechanism is also proved by quenching experiments and solvent deuterium isotope effect experiment. Graphitic N would be the main active site for PMS activation. Understanding the evolvement rule of properties of NCMs with preparation conditions combined with the correlations between reactivity and properties of NCMs is meaningful for preparation of nitrogen-doped biochar as well as the development of carbonaceous materials with high performance in persulfates-based advanced oxidation processes.
- Published
- 2022
35. Insight into the activation mechanisms of biochar by boric acid and its application for the removal of sulfamethoxazole
- Author
-
Jingjing Zhang, Xiaobo Lei, Daniel Dianchen Gang, Hong Yao, William Holmes, Mark E. Zappi, Xu Zhang, and Qiyu Lian
- Subjects
Environmental Engineering ,Aqueous solution ,Sulfamethoxazole ,Health, Toxicology and Mutagenesis ,chemistry.chemical_element ,Pollution ,Oxygen ,Water Purification ,Boric acid ,chemistry.chemical_compound ,Adsorption ,Boric Acids ,chemistry ,Charcoal ,Specific surface area ,Yield (chemistry) ,Biochar ,Humans ,Environmental Chemistry ,Waste Management and Disposal ,Pyrolysis ,Water Pollutants, Chemical ,Nuclear chemistry - Abstract
Sulfamethoxazole (SMX) is frequently detected in the environment and causes a huge threaten to human health. Biochar (BC) is a metal-free adsorbent and generally exhibits a good adsorption capacity for SMX. However, the current activated methods usually result in the high energy consumption and low yield of the biochar. In this study, biochar was activated by boric acid under limited oxygen condition. The yield of biochar was increased by 103% after the activated by boric acid. The specific surface area of BC was significantly increased from 766.6 m2·g−1 to 1190.6 m2·g−1. The intensity of the (111) diamond peak of B-BC was higher than that of BC, suggesting that boric acid affected the surface pyrolysis temperature of biochar. The proposed roles of boric acid in the activation process were to: 1) enhance the generation of micropores during the pyrolysis process; 2) improve the yield of biochar via the transformation pathways of C-corresponding bonds and physical blocking. The boric acid activated biochar (B-BC) had a higher adsorption capacity for SMX than BC under the various aqueous conditions. Hence, boric acid activated biochar is a promising porous adsorbent to enhance the removal of SMX and achieve practical application.
- Published
- 2022
36. Enhanced nitrate removal and high selectivity towards dinitrogen for groundwater remediation using biochar-supported nano zero-valent iron
- Author
-
Xiangyang Yu, Jing Ma, Yan Zhang, Anlei Wei, Jinxi Song, and Jingjing Chen
- Subjects
Zerovalent iron ,Chemistry ,Environmental remediation ,General Chemical Engineering ,Groundwater remediation ,02 engineering and technology ,General Chemistry ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,Redox ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,Nitrate ,Environmental chemistry ,Biochar ,Environmental Chemistry ,Selective reduction ,0210 nano-technology ,0105 earth and related environmental sciences ,Magnetite - Abstract
We prepared nano zero-valent iron/biochar composites (nZVI/BC) to remove nitrate from groundwater with harmless products. Results show nZVI/BCs derived from different mass ratios of Fe(0) to biochar exhibited different nitrate removal efficiencies, and the mass ratio of 1:2 developed the nZVI/BC with optimum nitrate removal. The nZVI/BC maintained preferable nitrate removal (75.0%–97.0%) over a wide pH range 2–12. Nitrate removal amount declined due to serious corrosion and clogging of nZVI/BC’s surface when initial nitrate concentration exceeded 40 mg/L. The nitrate removal process followed a first-order kinetic reaction. As regards real groundwater, the nZVI/BC removed more nitrate than both pure Fe(0) nanoparticles and biochar. Reaction product analysis revealed 60.1% of removed nitrate selectively became dinitrogen. X-ray photoelectron spectroscopy measurements suggested that nitrate-oxidized Fe(0) resulted in significant increase of magnetite on the surface of nZVI/BC. The redox potential and pH of long duration in reaction changed around −210 mV and 8–9, respectively. These changes facilitated the selective reduction of nitrate to dinitrogen. We also proposed that biochar may provide favorable circumstances for nitrate reduction by directly mediating redox potential, pH and electron transfer, which establishes a possible mechanism for the enhanced removal and selective reduction of nitrate. Our study suggests that nZVI/BC would be a promising alternative for the remediation of nitrate-contaminated groundwater.
- Published
- 2018
37. Effects of biochar amendment on the sorption and degradation of atrazine in different soils
- Author
-
He Huang, Jingjing Zhang, Guiping Xu, Qun Rong, Meizhu Cao, Peng Zhang, Chaolan Zhang, Haixia Wu, and Chuanzhang Li
- Subjects
Health, Toxicology and Mutagenesis ,Amendment ,Soil Science ,Sorption ,04 agricultural and veterinary sciences ,010501 environmental sciences ,01 natural sciences ,Pollution ,chemistry.chemical_compound ,chemistry ,Environmental chemistry ,Biochar ,Soil water ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Environmental Chemistry ,Degradation (geology) ,Alluvium ,Atrazine ,0105 earth and related environmental sciences - Abstract
Sugarcane top-derived biochar was added to an alluvial soil, a moist soil and a paddy soil at the rate of 0.2% and 0.5% (w/w). After the addition of 0.2% and 0.5% biochar, the sorption coefficients...
- Published
- 2018
38. Closing nutrient cycles with biochar- from filtration to fertilizer
- Author
-
Steven T. Barber, Jingjing Yin, Thomas A. Trabold, and Kathleen Draper
- Subjects
Biochemical oxygen demand ,Nutrient cycle ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Strategy and Management ,02 engineering and technology ,Biodegradable waste ,010501 environmental sciences ,Pulp and paper industry ,01 natural sciences ,Industrial and Manufacturing Engineering ,Soil conditioner ,visual_art ,Biochar ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,Environmental science ,Sewage treatment ,Charcoal ,Effluent ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Many food manufacturers in the U.S. are attempting to reduce the environmental footprint of their high biological oxygen demand (BOD) effluents due to increased risk of financial surcharges from publically owned treatment works, water scarcity issues and changes in societal opinions about large scale biodegradable waste releases. Managers at these firms are often reluctant to consider on-site processing due to their fear of committing to unfamiliar and complex wastewater treatment processes with excessive capital expenditures. While an abundance of research has been performed on the use of biochar (i.e. charcoal intended to be used for agricultural purposes produced from organic waste feedstocks via pyrolysis) to mitigate the problem of heavy metal ions from traditional manufacturing effluents by filtration, little is known on biochar's potential to treat high BOD industrial aqueous food wastes. This paper attempts to fill this gap by gauging the environmental and financial sustainability of a vertically integrated biochar filtration system, wherein maple wood biochar is used to treat high BOD tofu whey effluent and subsequently re-utilize that material as an enriched value-added soil amendment to improve crop quality and yields in basil and lettuce. Results show whey filtered biochar significantly increased fresh weight in basil and lettuce above the no biochar and unfiltered biochar controls. This novel approach could potentially help food and beverage manufacturers sustainably reduce their carbon and water footprints by harvesting and monetizing the nutrients found in their wastewaters, while allowing farmers to close regional nutrient cycles by returning nutrient rich carbon to the soil and reduce the use of synthetic fertilizers or costly peat moss or perlite soil amendments in greenhouses.
- Published
- 2018
39. Advanced pre-treatment of stripped biogas slurry by polyaluminum chloride coagulation and biochar adsorption coupled with ceramic membrane filtration
- Author
-
Ahmed Alengebawy, Jingjing Peng, Yi Ran, Xiuzhi Zhang, Ping Ai, and Keda Jin
- Subjects
Ceramics ,Environmental Engineering ,Nitrogen ,Health, Toxicology and Mutagenesis ,Microfiltration ,0208 environmental biotechnology ,Aluminum Hydroxide ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,law.invention ,Ammonia ,chemistry.chemical_compound ,Biogas ,law ,Biochar ,Environmental Chemistry ,Turbidity ,Filtration ,0105 earth and related environmental sciences ,Public Health, Environmental and Occupational Health ,Phosphorus ,General Medicine ,General Chemistry ,Pulp and paper industry ,Pollution ,020801 environmental engineering ,Ceramic membrane ,chemistry ,Biofuels ,Charcoal ,Slurry ,Adsorption - Abstract
Biogas slurry retention is a critical problem that cannot be solved by using the reuse method. Therefore, a new approach was taken to compensate for the shortcomings in the reuse method. In this study, after ammonia stripping, the ammonia nitrogen concentration in the stripped biogas slurry (SBS) still cannot reach the effluent standard (80 mg/L), so a variety of processes were needed to treat the SBS. Polyaluminum chloride (PAC) and rice husk biochar (B) were used to pretreat SBS. The effect of different pre-treatments on the COD value, ammonia nitrogen concentration, turbidity, total phosphorus (TP), and other indicators was investigated. After different pre-treatments by PAC and biochar, the pretreated SBS was filtered by a ceramic membrane, and the indicators of SBS were removed in the next step. After adding PAC and biochar together, ammonia nitrogen concentration was decreased to 68.09 mg/L, with a removal rate of 63%. The total phosphorus (TP) was also decreased, and its removal rate reached 92.5%. When the SBS was pretreated with PAC and biochar and then filtered through a ceramic membrane under different operating pressures, the removal rates of COD, total nitrogen (TN), turbidity, and suspended solids (SS) reached 81%, 88%, 96%, and 99% respectively. Moreover, by increasing the pressure from 0.1 to 0.3 MPa, the membrane flux was improved from 45 to 100.6 L/m2·h. This study proves that the combined pre-treatments of PAC and biochar can comprehensively remove various indicators from SBS while ensuring membrane flux during the membrane filtration process.
- Published
- 2020
40. One-step preparation of Cu/BC catalyzed the upgrading of heavy oil assisted by microwave
- Author
-
Li Jingjing, Bin He, Tang Xiaodong, and Guangfu Qin
- Subjects
Materials science ,chemistry.chemical_element ,One-Step ,Geotechnical Engineering and Engineering Geology ,Redox ,Copper ,Catalysis ,Metal ,Viscosity ,Fuel Technology ,Chemical engineering ,chemistry ,visual_art ,Biochar ,visual_art.visual_art_medium ,Microwave - Abstract
As a clean and efficient means to reduce the viscosity of heavy oil, microwave has broad research prospects in the field of heavy oil upgrading. For the microwave-assisted heavy oil upgrading process, the catalyst research has not made a breakthrough for a long time. In this study, a one-step method was used to load copper on biochar (BC) to prepare a catalyst (Cu/BC) in microwave, which can be used as a catalyst and microwave absorbing medium in the microwave-assisted upgrading process of heavy oil. The effect of the catalyst on the upgrading of heavy oil under different microwave reaction conditions was studied. The results show that the catalyst prepared by impregnation concentration of 0.15M metal salt has the best catalytic upgrading effect on heavy oil at a microwave temperature of 260 °C for 20 min, and the viscosity reduction rate of heavy oil reaches 78.55%. Under the action of the functional groups on the surface of the catalyst and the metal, the long-chain macromolecular hydrocarbons in the heavy oil were cracked into small molecular hydrocarbons, resulting in a decrease in the viscosity of the heavy oil. The analysis results show that the catalyst also has a positive effect on promoting the breaking of C–S bonds in heavy oil. The application of metal-supported biochar catalyst provides a new idea for the study of the viscosity reduction reaction of heavy oil under microwave irradiation.
- Published
- 2022
41. Hierarchically porous biochar preparation and simultaneous nutrient recovery from sewage sludge via three steps of alkali-activated pyrolysis, water leaching and acid leaching
- Author
-
Shuangyi Tao, Jingping Hu, Liang Yang, Jiakuan Yang, Huijie Hou, Lian Ding, Wenbo Yu, Keke Xiao, Ruibin Lv, Bingchuan Liu, Sha Liang, Gan Quan, and Jingjing Qiu
- Subjects
Economics and Econometrics ,Aqueous solution ,Adsorption ,Chemistry ,Biochar ,Ultrapure water ,Leaching (metallurgy) ,Porosity ,Waste Management and Disposal ,Pyrolysis ,Sludge ,Nuclear chemistry - Abstract
In this study, preparation of hierarchically porous biochar (PB) and simultaneous nutrient recovery from sewage sludge were realized through three steps of KHCO3-activated pyrolysis, water leaching and acid leaching. The prepared PB samples were applied as adsorbents for the removal of 4-chlorophenol (4-CP) from aqueous solutions. Effect of pyrolysis temperature on the physicochemical properties of PB samples was investigated. The PB prepared at 900 °C (PB-900) had the highest surface area (1476.0 m2/g) and total pore volume (1.138 cm3/g). The formation mechanism of porous structure of PB-900 was revealed by investigating the phase transformation, element distribution and pore structure evolution during its whole preparation process. PB-900 showed a high 4-CP adsorption rate of 14.4 mg/(g∙min), and its maximum adsorption capacity for 4-CP was up to 192.4 mg/g. The mechanism of 4-CP removal by PB-900 was mainly physical adsorption, and its strong aromaticity strengthened its interaction with 4-CP through π-π bonding. The water leaching solution in the preparation process of PB-900 contained a lot of nutrient elements (K, Si, P), which was recovered for grass seeds germination. Compared with the samples cultured with ultrapure water only, the seed germination rate of samples cultured with ultrapure water added with 20% of pretreated water leaching solution increased from 63% to 80%, and the average shoot length of grass grown for 7 days increased by 51.4%. The findings of this study suggest that KHCO3 is an alternative activator to prepare hierarchically porous biochar adsorbent from sewage sludge and realize simultaneous nutrient recovery.
- Published
- 2022
42. Supplying silicon alters microbial community and reduces soil cadmium bioavailability to promote health wheat growth and yield
- Author
-
Fenliang Fan, Hailong Wang, Duanyang Xu, Alin Song, Enzhao Wang, Zhongyang Li, Sai Wang, Paramsothy Jeyakumar, Zimin Li, and Jingjing Bi
- Subjects
Silicon ,Environmental Engineering ,Amendment ,Biological Availability ,chemistry.chemical_element ,Health Promotion ,engineering.material ,complex mixtures ,Soil ,Animal science ,Biochar ,Soil Pollutants ,Environmental Chemistry ,Waste Management and Disposal ,Triticum ,Cadmium ,Microbiota ,food and beverages ,Oryza ,Pollution ,Bioavailability ,Soil conditioner ,chemistry ,Microbial population biology ,Charcoal ,Soil water ,engineering ,Fertilizer - Abstract
Soil amendments of black bone (BB), biochar (BC), silicon fertilizer (SI), and leaf fertilizer (LF) play vital roles in decreasing cadmium (Cd) availability, thereby supporting healthy plant growth and food security in agroecosystems. However, the effect of their additions on soil microbial community and the resulting soil Cd bioavailability, plant Cd uptake and health growth are still unknown. Therefore, in this study, BB, BC, SI, and LF were selected to evaluate Cd amelioration in wheat grown in Cd-contaminated soils. The results showed that relative to the control, all amendments significantly decreased both soil Cd bioavailability and its uptake in plant tissues, promoting healthy wheat growth and yield. This induced-decrease effect in seeds was the most obvious, wherein the effect was the highest in SI (52.54%), followed by LF (43.31%), and lowest in BC (35.24%) and BB (31.98%). Moreover, the induced decrease in soil Cd bioavailability was the highest in SI (29.56%), followed by BC (28.85%), lowest in LF (17.55%), and BB (15.30%). The significant effect in SI likely resulted from a significant increase in both the soil bioavailable Si and microbial community (Acidobacteria and Thaumarchaeota), which significantly decreased soil Cd bioavailability towards plant roots. In particular, a co-occurrence network analysis indicated that soil microbes played a substantial role in wheat yield under Si amendment. Therefore, supplying Si alters the soil microbial community, positively and significantly interacting with soil bioavailable Si and decreasing Cd bioavailability in soils, thereby sustaining healthy crop development and food quality.
- Published
- 2021
43. Soil organic carbon characteristics affected by peanut shell biochar in saline-sodic paddy field.
- Author
-
WENHAO ZHU, CUILAN LI, SHUN ZHOU, YAN DUAN, JINGJING ZHANG, and FENG JIN
- Subjects
PEANUT hulls ,PEANUTS ,PADDY fields ,CARBON in soils ,BIOCHAR ,NUCLEAR magnetic resonance - Abstract
Biochar exhibits a profound impact on soil organic carbon (SOC) turnover and dynamics, but the underlying mechanism under field conditions is still unclear. A three-year field experiment was performed to evaluate the impact of peanut shell biochar applied at rates of 0, 33.75, 67.5, and 101.25 t/ha (referred to as B0, B1, B2, and B3, respectively) on SOC content and chemical composition in a saline-sodic paddy field using stable carbon isotope composition and 13C nuclear magnetic resonance technology. With increasing rates of biochar, SOC and aromatic carbon contents and alkyl carbon/oxygen-alkyl carbon and hydrophobic carbon/hydrophilic carbon ratios increased, while alkyl carbon and oxygen-alkyl carbon contents and aliphatic carbon/aromatic carbon ratio decreased. The new carbon from biochar and rice residues accounted for 26.5% of SOC under B0 and increased to above 80.0% under B2 and B3. The decay rate of old carbon was faster in biochar-amended than in unamended soil. SOC content was positively correlated with alkyl carbon/oxygen-alkyl carbon and hydrophobic carbon/hydrophilic carbon ratios but negatively correlated with aliphatic carbon/aromatic carbon ratio. The results suggest that biochar can increase SOC content by increasing its humification, aromaticity, and hydrophobicity. However, negative priming is not the main mechanism for SOC accumulation during the short-term period. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
44. Effect of exogenous carbonaceous materials on the bioavailability of organic pollutants and their ecological risks
- Author
-
Guangming Zeng, Haopeng Feng, Biao Song, Xiaoya Ren, Jingjing Wang, Chao Huang, Xiang Tang, Lin Tang, and Jia Wan
- Subjects
Pollutant ,021110 strategic, defence & security studies ,Ecology ,Soil biology ,0211 other engineering and technologies ,Soil Science ,02 engineering and technology ,010501 environmental sciences ,complex mixtures ,01 natural sciences ,Microbiology ,Soil contamination ,Bioavailability ,Environmental chemistry ,Biochar ,Environmental science ,Ecotoxicity ,Carbon nanomaterials ,0105 earth and related environmental sciences - Abstract
The presence of exogenous carbonaceous materials (ECMs) in organic contaminated soil is widespread because of their intentional application as carbonaceous amendments (e.g. biochar and activated carbon) or unintentional discharge (e.g. carbon nanomaterials). Most research so far has focused on the sorption behaviors of ECMs in soil. However, the impact of ECMs on the bioavailability of organic pollutants (OPs) and their ecological damages remain unclear. This paper presents an overview on how the ECMs affect bioavailability of OPs to different organisms, such as microorganisms, plants and earthworms. This is affected by different biological response and properties of ECMs. Moreover, the possible risks of ECMs on soil biota are also discussed at different level. This review presents a unique insight into risk assessment of ECMs. Further researches should focus on possible change in physicochemical characteristics of ECMs when exposed to the natural environment and the consequent influence on their sorption ability and ecotoxicity outcomes.
- Published
- 2018
45. Pyrolysis temperature affects pore characteristics of rice straw and canola stalk biochars and biochar-amended soils
- Author
-
Caidi Yang, Shenggao Lu, and Jingjing Liu
- Subjects
Macropore ,Chemistry ,Soil Science ,04 agricultural and veterinary sciences ,Ultisol ,010501 environmental sciences ,01 natural sciences ,Chemical engineering ,Specific surface area ,Biochar ,Alfisol ,Soil water ,040103 agronomy & agriculture ,0401 agriculture, forestry, and fisheries ,Porosity ,Pyrolysis ,0105 earth and related environmental sciences - Abstract
Soil physical properties are potentially affected by the addition of biochar. The effect is largely determined by the pore characteristics of biochar, especially the biochar’s feedstocks and pyrolysis processes. This study examined the pore characteristics of rice straw biochars (RSB) and canola stalk biochars (CSB) produced at pyrolysis temperatures of 250, 350, 450, 550, and 650 °C, and evaluated the effects of biochars on soil pore properties. The pore characteristics of biochars were characterized by nitrogen adsorption isotherm (NAI), mercury intrusion porosimetry (MIP), and scanning electron microscope (SEM). Each biochar was mixed into two soils (Ultisol and Alfisol) at the rate of 1% (w/w), then the soil-biochar mixtures were incubated for 90 days. The specific surface area (SSA) and total pore volume (TPV) measured by NAI technique increased with increasing pyrolysis temperature of biochar. Biochars pyrolyzed at 450 °C had the highest porosity and TPV measured by MIP. The largest pore class for RSB was the macropore (>75 μm), while the main pore classes for CSB were micropore (5–30 μm) and ultramicropore (0.1–5 μm). Incubation experimental results showed that biochar addition altered the pore size distribution of the Alfisol and Ultisol. RSB enhanced the total porosity and microporosity of soils, whereas CSB decreased total porosity, macroporosity, and mesoporosity. The water-holding capacity of soil was increased by increasing the amount of soil storage pores caused by biochar. Heatmap analysis on the correlation among pyrolysis temperature of biochar, pore characteristic and water retention capacity of biochar-amended soils illustrated that the pore properties of the Ultisol amended with CSB and the water properties of the Alfisol with CSB were highly correlated with pyrolysis temperature of biochar. Our results suggested the meso- and micro-pores in biochars played an important role to affect the soil response to biochar addition. Based on pore properties, pyrolysis temperature around 450 °C was found to be the optimal condition for producing porous biochar with larger porosity.
- Published
- 2021
46. Insights into the roles of biochar pores toward alleviating antibiotic resistance genes accumulation in biofiltration systems.
- Author
-
Wei, Lecheng, Zheng, Jingjing, Han, Yutong, Xu, Xiangyang, Li, Mengyan, and Zhu, Liang
- Subjects
- *
BIOFILTRATION , *DRUG resistance in bacteria , *BIOCHAR , *MICROBIAL metabolism , *XENOBIOTICS - Abstract
[Display omitted] • Biochar pores effectively reduced ARG accumulation in biofiltration systems. • Metagenomic and metaproteomic analyses elucidated microbial metabolism response. • Biochar pores affected the microbial defense strategy against antibiotic stress. Biofiltration systems would harbor and spread various antibiotic resistance genes (ARGs) when treating antibiotic micro-pollution, constituting a potential ecological risk. This study aimed to investigate the effects of biochar pores on ARG emergence and related microbial response mechanisms in bench-scale biofiltration systems. Results showed that biochar pores effectively reduced the absolute copies of the corresponding ARGs sul1 and sul2 by 54.1% by lowering the sorbed-SMX's bioavailability compared to non-porous anthracite. An investigation of antimicrobial resistomes revealed a considerable decrease in the abundance and diversity of ARGs and mobile gene elements. Metagenomic and metaproteomic analysis demonstrated that biochar pores induced the changeover of microbial defense strategy against SMX from blocking SMX uptake by EPS absorbing to SMX biotransformation. Microbial SOS response, antibiotic efflux pump, EPS secretion, and biofilm formation were decreased. Functions related to SMX biotransformation, such as sadABC -mediated transformation, xenobiotics degradation, and metabolism, were significantly promoted. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
47. The comparison study of multiple biochar stability assessment methods
- Author
-
Jie Chen, Songqi Leng, Li Jingjing, Lijian Leng, Liangliang Fan, Wenguang Zhou, Pengyu Wang, Lisha Ding, Liang Wei, Ting Yu, Jun Li, Qian Lu, and Jiefeng Chen
- Subjects
Thermogravimetric analysis ,Chemistry ,020209 energy ,chemistry.chemical_element ,Biomass ,02 engineering and technology ,Straw ,Analytical Chemistry ,Fuel Technology ,020401 chemical engineering ,X-ray photoelectron spectroscopy ,Environmental chemistry ,visual_art ,Biochar ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,Sawdust ,0204 chemical engineering ,Carbon ,Pyrolysis - Abstract
Biochar produced from thermochemical processing biomass is being developed as an effective way to mitigate climate change. The stability of biochar means the potential capability of fixing biochar carbon in the soil environment. The method for biochar stability assessment is significant to its climate change mitigation potential. However, there is no standard method available to use, and the stability of biochar assessed by the diverse methods has a significant difference. Nevertheless, the comparative study on the diversified stability assessment methods is limited. In the present study, the biochars were pyrolyzed from soybean straw, wood sawdust, and Chlorella Vulgaris at temperatures ranging from 300 to 800 °C. Then, the evaluation methods, such as ultimate analysis, proximate analysis, the Edinburgh stability tool, X-ray photoelectron spectroscopy (XPS), solid state 13C nuclear magnetic resonance (NMR), and thermogravimetric analysis, were compared to assess the stability of biochars. The stability indicators obtained by most methods, excluding aromatic C from NMR and C–C/C = C/ C–H from XPS, were closely related to the pyrolysis temperature (ANOVA analysis, p 0.36, p
- Published
- 2021
48. Synergistic interactions between biochar reacted with steam and CO2 originating from a diffusion reaction state and intrinsic ash
- Author
-
Yankun Li, Guozhang Chang, Jingjing Ma, Guijin Wang, and Qingjie Guo
- Subjects
Diffusion reaction ,Thermogravimetric analysis ,Chemistry ,020209 energy ,General Chemical Engineering ,Energy Engineering and Power Technology ,02 engineering and technology ,Chemical reaction ,Fuel Technology ,020401 chemical engineering ,Chemical engineering ,Palm kernel ,Biochar ,0202 electrical engineering, electronic engineering, information engineering ,Tube furnace ,0204 chemical engineering - Abstract
The interactions between reactions that occur while biochar is gasified in a mixed CO2/H2O(g) atmosphere remain unclear. In the present study, the reactions of palm kernel shell (PKS) biochars with CO2 and H2O(g) were systematically investigated using a thermogravimetric analyzer and a bench-scale tube furnace. The results show that the chemical reaction state and intrinsic ash are primarily responsible for the three interaction effects that have been extensively reported in the literatures. Specifically, an inhibitive effect occurred during D-biochar gasification under the chemical reaction regime, while a transition from independent effect to a competitive effect was observed under the diffusion reaction regime. Micropores suitable for the reaction of biochar with CO2 were found to be produced by H2O(g) in the presence of Ca species, which were representative AAEMs in the intrinsic ash of the PKS biochar. This phenomenon created the desired synergistic effect between the two reactions. The appearance of this synergistic effect was observed only under the diffusion reaction regime and in the presence of intrinsic ash.
- Published
- 2021
49. Waste valorization: Transforming the fishbone biowaste into biochar as an efficient persulfate catalyst for degradation of organic pollutant
- Author
-
Jingjing Wang, Guangming Zeng, Hao Zhang, Biao Song, Xiaoya Ren, Lin Tang, Maocai Shen, Jiangfang Yu, Haopeng Feng, Jiajing Zou, and Jiajia Wang
- Subjects
Renewable Energy, Sustainability and the Environment ,Singlet oxygen ,020209 energy ,Strategy and Management ,05 social sciences ,02 engineering and technology ,Persulfate ,Industrial and Manufacturing Engineering ,Catalysis ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Peroxydisulfate ,Biochar ,050501 criminology ,0202 electrical engineering, electronic engineering, information engineering ,Phenol ,Hydroxyl radical ,Pyrolysis ,0505 law ,General Environmental Science - Abstract
Fishbone is a major by-product of fishing processing and how to deal with the increasingly generated fishbone has been a big challenge. In an effort to convert the low-value waste into valuable material, this research explores the valorization of fishbone biowaste, which can be transformed into biochar as a persulfate activator for phenol removal. The fishbone derived biochar (FBBC) was prepared by one-step pyrolysis without additional template. The catalytic efficiency of FBBC increases with pyrolysis temperature, with FBBC-800 (pyrolyzed at 800 °C) exhibiting the best performance of 100% phenol (20 mg/L) removal within 60 min at the catalyst dosage of 0.1 g/L, which is comparable to other recently reported carbon-based catalysts but with the advantage of easy preparation, low cost and wastes valorization. The high efficacy of FBBC-800 is related to its large surface area (758.44 m2/g), carbonyl group and defective structure. In the FBBC-800/peroxydisulfate/phenol system, both radical and non-radical pathways are involved, among which hydroxyl radical is more important in radical pathway while singlet oxygen dominates in non-radical pathway. Electron transfer plays a key role in this process through electron capture experiment and electrochemical characterization. This study proposes a new strategy for the valorization of fishbone, and provides the guidance for the structure design of carbon-based catalyst for persulfate activation.
- Published
- 2021
50. Insight into the key factors in fast adsorption of organic pollutants by hierarchical porous biochar
- Author
-
Jingjing Wang, Jiajia Wang, Jiajing Zou, Yani Liu, Chengyang Feng, Qingqing Xie, Lin Tang, Jiangfang Yu, Haopeng Feng, and Ya Pang
- Subjects
Environmental Engineering ,Environmental remediation ,Health, Toxicology and Mutagenesis ,0211 other engineering and technologies ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Adsorption ,Monolayer ,Biochar ,Environmental Chemistry ,Waste Management and Disposal ,Hierarchical porous ,0105 earth and related environmental sciences ,Pollutant ,021110 strategic, defence & security studies ,Chemistry ,Pollution ,Kinetics ,Key factors ,Chemical engineering ,Charcoal ,Environmental Pollutants ,Porosity ,Water Pollutants, Chemical - Abstract
Low-cost biochar adsorbent owning great potential for environmental remediation faces a bottleneck in application for its unsatisfied adsorption performance. Compared to the efforts on increasing adsorption capacity, improving adsorption speed which is important for treatment efficiency is often neglected. Herein, a hierarchical porous biochar (HPB) derived from shrimp shell was prepared and exhibited good adsorption capacity (Qm>300 mg/g) and fast adsorptive equilibrium (≤10 min) towards three typical aromatic organics, whose adsorption universality was further proved by two-way ANOVA analysis. Whereafter, model analysis demonstrated that, the adsorptive forms (mono- and multi-layers) on HPB depended on whether the contaminant is charged. Compared to the benzene-ring site of organics, the charged site contributed 5.13 times to adsorption promotion in monolayer but -0.49 times in inhibition for multilayers forms. Simultaneously, functional group sites contributed relatively weak (0.023 to 0.342 times only). Following structural control revealed that, hierarchical pore structure of HPB was the key for the fast adsorption speed, and highly graphitic structure was important for the high adsorption capacity. This study aims to provide an advanced biochar adsorbent, not only in adsorption capacity but also in adsorptive speed, and reveal the relationship between the structure and adsorption performance of biochar.
- Published
- 2021
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.