502 results on '"Organic contaminant"'
Search Results
2. Unraveling the mechanisms of organic contamination on gold pulse compression gratings: From cluster formation to stratified adsorption
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Liu, Xujie, Bai, Qingshun, Wang, Tingting, Li, Yuhai, Xu, Xueshi, and Gao, Siyu
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- 2025
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Catalog
3. Predicting aqueous-phase hydroxyl radical reaction kinetics with organic compounds in water, atmosphere, and biological systems
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Keshavarz, Mohammad Hossein, Shirazi, Zeinab, Jafari, Mohammad, and Jorfi Shanani, Seyedeh Masoumeh
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- 2025
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4. Application of large-scale honeycomb biofilter as pretreatment system to improve the quality of raw city water: Efficiency and economic analysis
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Said, Nusa Idaman, Mahasti, Nicolaus Nezha Nunez, Widayat, Wahyu, Hernaningsih, Taty, Yudo, Satmoko, Chandrawaty, Devona, Fani, Ayudia Mutiara, Shoiful, Ahmad, Fuad, Nur Muhamad, Luvita, Veny, Nugroho, Rudi, Primeia, Sandia, Ikbal, Arifudin, Nugraha, Yosep Widi, Setiyono, and Septian, Ardie more...
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- 2025
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5. A novel organic-inorganic hybrid hollow polymer capsule with rich amino/imino groups for anionic contaminant removal in wastewater: Synthesis, performance and mechanism
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Chang, Limin, Liu, Huiyuan, Zheng, He, Lv, Shen, Yang, Yingying, Liu, Shaohua, and Fu, Jianwei
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- 2024
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6. Development of a 3D Ni-Mn binary oxide anode for energy-efficient electro-oxidation of organic pollutants
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Mirehbar, Keyvan, Sánchez, Jaime S., Pinilla, Sergio, Oropeza, Freddy E., Sirés, Ignasi, de la Peña O’Shea, Víctor A., Palma, Jesús, and Lado, Julio J.
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- 2024
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7. Aging of microplastics increases their adsorption affinity towards organic contaminants
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Bhagat, Kartik, Barrios, Ana C., Rajwade, Kimya, Kumar, Abhishek, Oswald, Jay, Apul, Onur, and Perreault, François
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- 2022
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8. ab initio study of Mn-based systems for oxidative degradation
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Crago, Colin, Zhong, Shifa, Rajupet, Siddharth, Zhang, Huichun, and Lacks, Daniel J.
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- 2022
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9. Impact of organic contaminant viscosity and cation hydrated radius on the rheological properties of sodium-bentonite: experimental and numerical investigations.
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Ouhadi, Vahid Reza and Goli, Mohammad
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RHEOLOGY ,YIELD stress ,PORE fluids ,PERMITTIVITY ,ORGANIC compounds - Abstract
Soil contamination by organic and hazardous substances is a critical environmental issue, particularly in developing countries. This study investigates the limitations of double-layer theory for bentonite–organic contaminant interactions through experimental and numerical analysis. Using NaCl and KCl as salts and acetone, isopropyl alcohol, and glycerol as organic contaminants, the research explores the rheological properties of Na-bentonite dispersions. The double-layer theory, particularly Stern's model, has limitations in accurately representing the interaction between bentonite and organic contaminants. The research aims to validate the double-layer equations and investigate the impact of viscosity and cation hydrated radius on the rheological properties of Na-bentonite. The novelty lies in introducing a range of viscosities into the pore fluid to challenge existing double-layer equations. Numerical calculations based on double-layer theory were used to analyze the total interaction energy. The study found that without salt, bentonite showed similar rheological behavior in acetone and alcohol but higher yield stress in glycerol. NaCl up to 0.1 M increased yield stress, while 0.5 M reduced it. KCl had a more pronounced effect on rheological properties than NaCl, highlighting the importance of cation hydrated radius. In soil-organic mixtures, lower viscosity organic chemicals increased yield stress. Despite similar dielectric constants, acetone showed higher yield stress than glycerol at lower concentrations, but at higher concentrations, dielectric constant differences became dominant. The study confirms the limitations of double-layer theory in bentonite–organic contaminant interactions, particularly regarding pore fluid viscosity, though it remains reliable at high contaminant concentrations. [ABSTRACT FROM AUTHOR] more...
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- 2025
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10. Pore Fluid Dielectric Constant Effect on Geotechnical and Geo-Environmental Properties of Smectite and Kaolinite.
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Ouhadi, Vahid Reza and Goli, Mohammad
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PORE fluids , *PERMITTIVITY , *DIPOLE moments , *LIQUID dielectrics , *WATER table , *KAOLINITE - Abstract
Organic compounds pose significant environmental concerns, including groundwater contamination. Clays are commonly used as liners to prevent contaminant permeation into the groundwater tables, necessitating an understanding of clay's behavior in the presence of organic compounds. The presence of organic contaminants results in changes in the dielectric constant of pore fluid, which influences the interparticle energies and double layer thickness in the soil-pore fluid system. This study aims to elucidate the mechanisms of these changes by examining the response of smectite and kaolinite to variations in the dielectric constant. Experimental tests, including Atterberg limits, unconfined compression strength, water adsorption, sedimentation, pH, and XRD, were performed on clay samples at different concentrations of water-isopropyl alcohol mixtures. Results indicate that smectite exhibits higher Atterberg limits and water adsorption capacity compared to kaolinite. Smectite also shows more pronounced changes in response to decreasing dielectric constant. Conversely, changes in kaolinite's behavior were attributed to variations in pore fluid viscosity and dipole moment. These findings emphasize the importance of considering viscosity and dipole moment alongside dielectric constant in predicting kaolinite behavior. Overall, this study enhances the understanding of how variations in pore fluid dielectric constant affect the geotechnical and geo-environmental behavior of smectite and kaolinite. [ABSTRACT FROM AUTHOR] more...
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- 2024
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11. Removal of antibiotic residue from aqueous solution by advanced oxidation process
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Prajkta Shahaji Sarkale, Sanjivani Tanaji Chougale, and Aasawari Suhas Jadhav
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organic contaminant ,tetracycline ,aop ,cod ,Environmental protection ,TD169-171.8 - Abstract
Advanced oxidation processes are low-cost, highly efficient, and eco-friendly technologies in the removal of organic pollutants in wastewater using hydroxyl radicals for oxidation. Hydroxyl radicals possess high oxidation potential and can react with organic compounds, resulting in the complete mineralization of these compounds into carbon dioxide, water, and inorganic salt or their conversion into other compounds. The present investigation deals with the removal of tetracycline from water using simulated ultraviolet radiation and hydrogen peroxide, assessing the effect of operational parameters like the solution's initial pH, retention time, hydrogen peroxide dosage in terms of chemical oxygen demand (COD) removal from the standard aqueous solution of tetracycline. Results indicate that alkaline conditions and larger hydrogen peroxide dosage negatively affect the degradation. The removal efficiency of 68 % was achieved at 150 min of batch reaction under optimum conditions: pH = 4, and a dose of hydrogen peroxide of 0.3 ml per 100 ml of the solution to be treated. At optimum conditions, LC-MS/MS (liquid chromatography tandem mass spectrometry) analysis results showed a reduction in initial concentration of aqueous solution of tetracycline. Photocatalytic degradation followed pseudo-first-order kinetics with the rate constant (k) of 0.0061 min-1. Photocatalysis based on hydrogen peroxide is effective in the degradation of tetracycline in an aqueous solution and can be applied as a pretreatment of hospital wastewater containing tetracycline residues. more...
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- 2024
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12. REMOVAL OF ANTIBIOTIC RESIDUE FROM AQUEOUS SOLUTION BY ADVANCED OXIDATION PROCESS.
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Sarkale, Prajkta Shahaji, Chougale, Sanjivani Tanaji, and Jadhav, Aasawari Suhas
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ANTIBIOTIC residues ,HYDROGEN peroxide ,LIQUID chromatography-mass spectrometry ,ORGANIC compounds removal (Sewage purification) ,AQUEOUS solutions ,CHEMICAL oxygen demand - Abstract
Advanced oxidation processes are low-cost, highly efficient, and eco-friendly technologies in the removal of organic pollutants in wastewater using hydroxyl radicals for oxidation. Hydroxyl radicals possess high oxidation potential and can react with organic compounds, resulting in the complete mineralization of these compounds into carbon dioxide, water, and inorganic salt or their conversion into other compounds. The present investigation deals with the removal of tetracycline from water using simulated ultraviolet radiation and hydrogen peroxide, assessing the effect of operational parameters like the solution's initial pH, retention time, hydrogen peroxide dosage in terms of chemical oxygen demand (COD) removal from the standard aqueous solution of tetracycline. Results indicate that alkaline conditions and larger hydrogen peroxide dosage negatively affect the degradation. The removal efficiency of 68 % was achieved at 150 min of batch reaction under optimum conditions: pH = 4, and a dose of hydrogen peroxide of 0.3 ml per 100 ml of the solution to be treated. At optimum conditions, LC-MS/MS (liquid chromatography tandem mass spectrometry) analysis results showed a reduction in initial concentration of aqueous solution of tetracycline. Photocatalytic degradation followed pseudo-first-order kinetics with the rate constant (k) of 0.0061 min-1. Photocatalysis based on hydrogen peroxide is effective in the degradation of tetracycline in an aqueous solution and can be applied as a pretreatment of hospital wastewater containing tetracycline residues. [ABSTRACT FROM AUTHOR] more...
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- 2024
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13. Recent Advances in Electrochemical Treatment Technology for the Remediation of Contaminated Soil.
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Abkenar, Shiva Dehghan, Khakipour, Nazanin, and Alahdadi, Iraj
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SOIL remediation ,SOIL pollution ,SOIL quality ,ELECTRIC fields ,SOIL classification - Abstract
Soil contamination presents a significant hazard to both ecosystems and human well-being. Therefore, there is a need for cost-effective and environmentally friendly approaches to decontaminate polluted soils. Soil remediation involves the treatment of contaminated land to enhance soil quality, safeguarding public health and the ecosystem. Among the promising technologies for remediating soils contaminated with various substances, including inorganic, organic, and mixed contaminants, is electrochemical remediation. Electroremediation (ER) is an in-situ method that employs low direct electric current among electrodes fixed in contaminated soils to create an electric field. This review paper examines the advancements made in recent years in electrochemical remediation as an effective method for decontaminating polluted soil. The discussion begins by exploring electrochemical remediation, followed by the classification of contamination types in soil. The focus then shifts to the application of electrochemical treatment methods for removing heavy metals and organic contaminants from the soil. Additionally, the paper highlights recent progress in the exploration of integrating electrochemical treatment with other remediation techniques, such as phytoremediation and bioremediation. [ABSTRACT FROM AUTHOR] more...
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- 2024
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14. Component,distribution and formation mechanism of foulant in the process of desulfurization wastewater treatment by membrane distillation
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LI Bang, TIAN Tengfei, WU Junfeng, ZHU Xinfeng, HAN Changrui, CUI Luxue, ZHANG Xia, and YUN Yanbin
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desulfurization wastewater ,membrane distillation ,organic contaminant ,inorganic contaminant ,membrane fouling ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
The effect of pollutants on flux during the treatment of desulfurization wastewater by polyvinylidene fluoride(PVDF) membranes were investingated. Then,the pioneer pollutants and dominant pollutants causing flux changes at different periods in the treatment process were determined. The flow rate playd a dominant role in the distribution of the membrane fouling layer. A three-dimensional single-phase computational fluid dynamics(CFD) method was used to evaluate the flow state in the membrane module system,while SEM,X-ray energy dispersive spectrometer(SEM-EDS),and FTIR were used to analyze the distribution,composition and structure of pollutants on the membrane surface in the horizontal and vertical directions in different fouling periods. It was found that the change in membrane flux is divided into two main phases: a slowly decreasing phase and a rapidly decreasing phase, and the distinct flux variation in the two phases were attributed to differences in the dominant pollutants. Organic pollutants were the pioneer pollutants that lead to a slow decline in flux in the early stage,and mineral scaling was the dominant factor in the rapid decline of flux in the later stage. Organic pollutants mainly included humic acid and fulvic acid, which first deposited on the membrane surface during the membrane distillation process through hydrophobic-hydrophobic interaction with the membrane surface, causing a slow decrease in flux. Mineral contaminants, mainly calcium sulfate, nucleate and crystallize in the bulk solution as the concentration process, and grew rapidly on the membrane surface resulting in a rapid decrease in flux. more...
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- 2024
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15. Non-native Rhizophora mangle as sinks for coastal contamination on Moloka'i, Hawai'i
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Geoffrey Szafranski, Elise F. Granek, Michelle L. Hladik, and Mia Hackett
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Mangrove roots ,Microplastic pollution ,Non-native mangrove ,Organic contaminant ,Pesticide ,Sediment ,Environmental sciences ,GE1-350 - Abstract
Coastal mangrove forests provide a suite of environmental services, including sequestration of anthropogenic contamination. Yet, research lags on the environmental fate and potential human health risks of mangrove-sequestered contaminants in the context of mangrove removal for development and range shifts due to climate change. To address this, we conducted a study on Moloka'i, Hawai'i, comparing microplastic and pesticide contamination in coastal compartments both at areas modified by non-native red mangroves (Rhizophora mangle) and unmodified, open coastline. Sediment, porewater, and mangrove plant tissues were collected to quantify microplastic and pesticide concentrations across ecosystem type. Average microplastics were similar between mangrove (8.89 items/kg) and non-mangrove areas (9.01 items/kg) in sediment and porewater, but mangrove roots were a substantial reservoir of microplastics (2004 items/kg). Additionally, there was a strong relationship between proximity to urban development and microplastics detected. Six pesticides were detected, most commonly the insecticide bifenthrin, found in most sediment samples (11.3 ng/g), all root samples (243.3 ng/g), and one propagule sample (8.60 ng/g). Other pesticides detected with appreciable concentrations include the neonicotinoid insecticide imidacloprid and the legacy insecticide transformation product, p,p’-DDE. The other detections, all at concentrations < 1 ng/g, were p,p’-DDT, trifluralin, and permethrin. The high concentrations of bifenthrin in roots compared to lower concentrations detected in sediment suggest that mangrove roots strongly accumulate some pesticides, indicating mangrove roots as a sink for organic contaminants. Study methods could be applied to other Hawaiian Islands and other locations where mangroves have been introduced to further examine the observed trends. Additional information is needed to investigate the fate and cycling of pesticides and microplastics adhered to mangrove roots, to better inform non-native mangrove removal efforts on Moloka'i and elsewhere. more...
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- 2024
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16. 膜蒸馏处理脱硫废水过程中污染物组成、分布及形成机理.
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李 棒, 田腾飞, 吴俊峰, 朱新锋, 韩昌睿, 崔璐雪, 张 霞, and 贠延滨
- Abstract
Copyright of Industrial Water Treatment is the property of CNOOC Tianjin Chemical Research & Design Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
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- 2024
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17. Mechanism insights into photo–assisted peroxymonosulfate activation on oxygen vacancy–enriched nolanites via an electron transfer regime.
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Liu, Xiangji, Qiao, Xingxing, Yang, Ruqian, Wei, Dong, Qu, Xinghua, Cao, Hailei, Li, Yafeng, Zhong, Zhou, and Lü, Jian
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CHARGE exchange , *IRRADIATION , *ORGANIC water pollutants , *PEROXYMONOSULFATE , *ELECTRON density , *BISPHENOL A - Abstract
[Display omitted] • Nolanites (FVO) with adjustable concentrations of oxygen vacancies (Vo) were successfully synthesized. • FVO–180 achieved an efficient degradation of bisphenol A dominated by a nonradical process via the electron transfer regime. • The roles of light and V O in electron transfer processes were unveiled in a photo-assisted persulfate activation system. • New insights into the mechanism of photo-assisted persulfate activation by FVO were proposed. The utilization of photo–assisted persulfate activation for the removal of organic contaminants in water has garnered significant research interest in recent times. However, there remains a lack of clarity regarding specific contributions of light irradiation and catalyst structure in this process. Herein, a photo–assisted peroxymonosulfate (PMS) activation system is designed for the highly efficient degradation of organic contaminants on oxygen vacancy–enriched nolanites (Vo–FVO). Results suggest that the degradation of bisphenol A (BPA) in this system is a nonradical–dominated process via an electron transfer regime, in which V O improves the local electron density and thus facilitates the electron shuttling between BPA and PMS. During BPA degradation, PMS adsorbed at the surface of FVO–180 withdraws electrons near V O and forms FVO–PMS* complexes. Upon light irradiation, photoelectrons effectively restore the electron density around V O , thereby enabling a sustainable electron transfer for the highly efficient degradation of BPA. Overall, this work provides new insights into the mechanism of persulfate activation based on defects engineering in nolanite minerals. [ABSTRACT FROM AUTHOR] more...
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- 2023
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18. Characterization of organic contaminants in hair for biomonitoring purposes
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Ashna Lallmahomed, Fabien Mercier, Nathalie Costet, Clémence Fillol, Nathalie Bonvallot, and Barbara Le Bot
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Hair analysis ,Organic contaminant ,Exposure assessment ,Biomonitoring ,Environmental sciences ,GE1-350 - Abstract
Biological monitoring is one way to assess human exposure to contaminants. Blood and urine are often used as biological matrices, but hair is an innovative and effective tool for quantifying more biomarkers over a wider exposure window. In order to improve the use of hair in exposure assessment, this article identifies relevant compounds in the literature to investigate hair contamination. Statistical analysis was performed to correlate the physical-chemical properties of the relevant compounds and their concentration levels in hair. Phthalates, pyrethroids and organophosphate flame retardants were chosen for further study of the interpretation of hair measurements for exposure assessment. No significant correlation was found between the average concentration levels in the literature and the physical-chemical properties of the selected compounds. This work also explores the properties of hair and the analytical process that may impact the quantification of organic contaminants in hair. The sample preparation method (sampling, storage, washing) were also studied and adaptations were suggested to improve the existing methods. more...
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- 2024
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19. Recyclable and flexible Bi(Ho3+-Yb3+)OBr/g-C3N4 composite porous fiber for efficient water purification and real-time temperature sensing.
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Li, Junhan, Li, Yue, Pun, Edwin Yue Bun, and Lin, Hai
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WATER purification ,NANOFIBERS ,FIBROUS composites ,PHOTOCATALYSTS ,RHODAMINE B ,PHOTODEGRADATION ,HOLMIUM ,YTTERBIUM - Abstract
Herein, an electrospinning porous nanofiber with large specific surface area, excellent flexibility, remarkable tensile strength, and high stability of thermal degradation has been developed by loading Ho
3+ /Yb3+ co-doped BiOBr/g-C3 N4 (BHY/CN) heterojunction photocatalysts on polyacrylonitrile (PAN) nanofibers. The optimized BHY/CN-2 nanofiber demonstrates outstanding photocatalytic activity for the degradation of 98.83% tetracycline (TC, 60 min) and 99.06% rhodamine B (RhB, 90 min) under simulated sunlight irradiation, and maintains a high level of reusability and recycling stability in three cycles. In addition, temperature monitoring of the catalytic degradation process can be feedback by (5 F4 ,5 S2 ) →5 I8 and5 F5 →5 I8 radiation transitions of Ho3+ with excellent sensitivity. More importantly, the nanofiber luminescence performance is enhanced by the doping of g-C3 N4 , which maintain the effective upconversion luminescence properties even in water, providing a reliable reference for real-time monitoring and feedback of the operating temperature, and further expanding the application fields of photocatalysts. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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20. Potential of the Bioaugmentation Method to Enhance the Remediation Process in the Solidification/Stabilization Method.
- Author
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Rais, Nurul Nasuha Mohd, Rachman, Ranno Marlany, and Kamil Author, Nor Amani Filzah Mohd
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BIOREMEDIATION ,HEAVY metals ,CHEMICAL oxygen demand ,SOLIDIFICATION ,PORTLAND cement ,POLLUTANTS - Abstract
In the published literature, Stabilization/Solidification (S/S) method was excellent in remediating heavy metals, whereas bioremediation was excellent in remediating organic contaminants. However, tremendous papers only focus on specific contaminants, while the polluted environment is not due to specific contaminants. In this paper, both methods were combined and targeted to remediate both group contaminants, namely organic contaminants and heavy metals. The study focused on the effect of the bioaugmentation method on S/S method with the use of Portland cement as a binder in the S/S method. Sphingobacterium spiritivorum (bacteria) and Aspergillus brasiliensis (fungi) as degrading agents in the bioaugmentation method. The S/S matrices were tested for leaching behaviour which is the concentration of Chemical Oxygen Demand (COD) and heavy metals after 14 and 28 days of hydration. Bacteria augmentation showed a better COD removal compared to without augmentation (S/S method only). Bacteria augmentation also shows better removal compared to fungi augmentation for both hydration days. In addition, by using the S/S method only, COD concentration was increased from 14 to 28 days. For heavy metals, chromium shows a positive result; bacteria augmentation shows the lowest concentration after 14 and 28 days of hydration. While other metals, S/S method only shows the lower concentration compared to samples that augment with bacteria and fungi. Nonetheless, the concentrations of heavy metals in all samples did not exceed the USEPA limit. Therefore, this study contributed to the possibility of combining the S/S and bioaugmentation methods by adding degrading agents to remediate contaminants in the sludge, especially for sludge that contains high organic contaminants. [ABSTRACT FROM AUTHOR] more...
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- 2023
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21. A Systematic Review on Earthworms in Soil Bioremediation.
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Tagliabue, Francesca, Marini, Enrica, De Bernardi, Arianna, Vischetti, Costantino, and Casucci, Cristiano
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BIOREMEDIATION ,EARTHWORMS ,SOIL pollution ,PHYTOREMEDIATION ,WEB databases - Abstract
Bioremediation techniques are increasingly popular in addressing soil pollution. Despite this, using earthworms as first actors or adjuvants in decontamination is an open and little-discussed field. This paper focuses on vermiremediation effectiveness alone or combined with other bioremediation methods, such as phytoremediation and bioaugmentation. Literature was collected following the PRISMA criteria, setting the search with the following keywords: "(vermiremediation) AND (bioremediation OR phytoremediation OR plant*) AND (bioaugmentation OR bacteria)". The investigation was performed on Google Scholar, Science Direct, SciFinder and Web of Science databases. The article data were collected, compared, elaborated, graphically summarised and discussed to assess if the earthworms' activities play a critical role in tackling several soil pollutions. Furthermore, the review aimed to identify the most promising techniques in the function of the xenobiotic examined: organic, inorganic or both. Any gaps and criticism were highlighted to facilitate future research in this study area. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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22. Analytical Model for the Design of Permeable Reactive Barriers Considering Solute Transport in a Dual-Domain System.
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Xie, Haijian, Yu, Mengzhen, Yan, Huaxiang, Thomas, Hywel Rhys, Chen, Yunmin, and Chen, Yun
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PERMEABLE reactive barriers , *IN situ remediation , *GROUNDWATER remediation , *ANALYTICAL solutions - Abstract
A permeable reactive barrier (PRB) is an effective groundwater in situ remediation technology, and the design methods used for PRBs are significant in ensuring that they meet remediation goals. Steady-state analytical solutions are an effective tool to provide conservative and simple design methods. A steady-state analytical solution is proposed to describe organic contaminant transport through the PRB and aquifer in a PRB and cut-off wall system. The proposed analytical solution may serve as an effective tool to provide conservative and simple design methods. The shape factor (S) is introduced at the PRB-aquifer interface to investigate the effects of a PRB's layout forms on its performance. The results show that the relative contaminant concentration at the point of compliance for a PRB with S=8 is 11 orders of magnitude larger than that without considering the shape factor. Effects of degradation, dispersion, and advection on PRB design are subjected to dimensionless analysis. Dimensionless analysis shows that degradation plays a key role in decreasing contaminant concentration in the PRB. In addition, increasing advection may promote contaminant transport from the source to the aquifer. Simplified solutions to estimate PRB thickness and source remediation time are derived for the practical design and performance evaluation of the PRB system. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
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23. Exploring contaminants as a disruptor of temperature-dependent sex determination in sea turtle hatchlings
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Arthur D. Barraza, Larissa Young, Caitlin E. Smith, David T. Booth, Christine A. Madden Hof, Kimberly A. Finlayson, Frederic D. L. Leusch, and Jason P. van de Merwe
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organic contaminant ,sea turtle ,sex ratio ,trace elements ,sex determination ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Sea turtle nesting beaches are experiencing increased sand temperatures as climate change progresses. In one major green turtle (Chelonia mydas) nesting beach in the northern Great Barrier Reef, over 99 percent of hatchlings are female. The effects of contaminants on sea turtle hatchling sex determination are not often explored. Liver samples were collected from green turtle hatchlings that were sacrificed for histological sex determination in a parallel study on the effects of sand cooling on sex ratios, and analysed for trace elements via acid digestion and organic contaminants via in vitro cytotoxicity bioassays. Chromium, antimony, barium, and cadmium have previously been demonstrated to be estrogenic, and concentrations of these elements were used to calculate three estrogenic indexes for each clutch: predicted relative estrogenic potency (PEEQA), the sum of percent trace elements above the median of all samples (TEOM), and the sum of percent estrogenic elements above the median of all samples (EstroEOM). Excluding an outlier clutch, cadmium, antimony, and EstroEOM had significant positive relationships with sex ratio deviation. Mean clutch cobalt, lead, antimony and barium, also had a significant positive relationship with clutch sex ratio. There was no relationship between in vitro cytotoxicity of liver extracts and sex ratio, however, 9% of hatchlings had organic contaminants high enough to suggest potential cellular damage. Contaminant effects on sex determination are likely to be caused by a mixture of contaminant interactions as well as temperature. Many trace elements detected in this study have also been linked to negative health effects on hatchlings in previous studies. Considering the risks of feminization due to climate change and potential contaminant effects on hatchling health and sex determination, future studies exploring contaminant effects on sea turtle hatchling sex determination are recommended. more...
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- 2023
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24. 基于梯度提升回归树的有机污染物生物-沉积物积累 因子预测模型.
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王如冰 and 蔡喜运
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ECOLOGICAL risk assessment ,REGRESSION trees ,ORGANIC compounds ,INDEPENDENT variables ,BIOACCUMULATION - Abstract
Copyright of Asian Journals of Ecotoxicology is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
- Full Text
- View/download PDF
25. Removal Behavior of Benzohydroxamic Acid from Beneficiation Wastewater via Fe(III) Chelation and Precipitation Flotation Process
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Han, Guihong, Du, Yifan, Huang, Yanfang, Wang, Wenjuan, Su, Shengpeng, Liu, Bingbing, Lazou, Adamantia, editor, Daehn, Katrin, editor, Fleuriault, Camille, editor, Gökelma, Mertol, editor, Olivetti, Elsa, editor, and Meskers, Christina, editor more...
- Published
- 2022
- Full Text
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26. New Ray on Remediation of High Rings Polycyclic Aromatic Hydrocarbons: Remediation of Raw Petroleum Sludge Using Solidification and Stabilization Method
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Noor Faiza Roslee, Nor Amani Filzah Mohd Kamil, Aeslina Abdul Kadir, Abdul Rahim Jalil, Nurhidayah Hamzah, Norazian Mohamed Noor, and Andrei Victor Sandu
- Subjects
remediation ,solidification/stabilization ,organic contaminant ,hazardous waste ,Mining engineering. Metallurgy ,TN1-997 ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Solidification/Stabilization (S/S) method with cement as a binder to remediate metals in petroleum sludge has been successfully proven. However, this technique has not yet been explored to remediate organic contaminants since a high concentration of Total Petroleum Hydrocarbon (TPH) was also detected in the sludge. This study focuses on remediating 16 Polycyclic Aromatic Hydrocarbons (PAHs) compounds in raw petroleum sludge with Portland cement as a binder using the S/S method. The initial concentration of 16 PAHs in the raw sludge was first measured before the performance of the S/S method to remediate the PAHs were evaluated. The S/S matrices were tested for leaching behavior and strength after 7 and 28 days by air curing. The leaching test was measured using the Toxicity Characteristics Leaching Procedure (TCLP), and the remaining PAHs concentration in the matrices was analyzed using a Gas Chromatography-Mass Spectrometer (GC-MS). In the raw sludge, all 16 PAHs compounds were below the standard limit except for Benzo(a)anthracene, Benzo(a)pyrene, Dibenzo(ah)anthracene, and Indeno(1,2,3- cd_ pyrene), which are considered as high rings PAHs. The high rings PAHs show lower concentration in leachate than low rings PAHs, which indicates the potential of the S/S method in remediating high rings PAHs. The high sludge ratio in S/S matrices has shown that the percentage strength is increasing, similar to Portland cement. Therefore, this study contributed to the possibility of the S/S method in the remediation of PAHs in petroleum sludge by using only Portland cement as a binder. more...
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- 2022
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27. Magnetic Nanocomposites for the Remote Activation of Sulfate Radicals for the Removal of Rhodamine B.
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Paul, Pranto, Nicholson, Marissa, and Hilt, J. Zach
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ORGANIC water pollutants , *POLYACRYLAMIDE , *IRON oxide nanoparticles , *RHODAMINE B , *NANOCOMPOSITE materials , *MAGNETIC nanoparticles , *ENVIRONMENTAL remediation - Abstract
The widespread presence of numerous organic contaminants in water poses a threat to the ecological environment and human health. Magnetic nanocomposites exposed to an alternating magnetic field (AMF) have a unique ability for magnetically mediated energy delivery (MagMED) resulting from the embedded magnetic nanoparticles; this localized energy delivery and associated chemical and thermal effects are a potential method for removing contaminants from water. This work developed a novel magnetic nanocomposite—a polyacrylamide-based hydrogel loaded with iron oxide nanoparticles. For this magnetic nanocomposite, persulfate activation and the contamination removal in water were investigated. Magnetic nanocomposites were exposed to AMF with a model organic contaminant, rhodamine B (RhB) dye, with or without sodium persulfate (SPS). The removal of RhB by the nanocomposite without SPS as a sorbent was found to be proportional to the concentration of magnetic nanoparticles (MNPs) in the nanocomposite. With the addition of SPS, approximately 100% of RhB was removed within 20 min. This removal was attributed primarily to the activation of sulfate radicals, triggered by MNPs, and the localized heating resulted from the MNPs when exposed to AMF. This suggests that this magnetic nanocomposite and an AMF could be a unique environmental remediation technique for hazardous contaminants. [ABSTRACT FROM AUTHOR] more...
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- 2023
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28. Characteristics of polycyclic aromatic hydrocarbons in the soils of different functional areas of a typical industrial capital city, Taiyuan, Shanxi province, China.
- Author
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Wu, Zhangwei, Duan, Yonghong, Liu, Liwen, Xu, Lishuai, Yao, Xuhong, and Chen, Xiangling
- Subjects
POLYCYCLIC aromatic hydrocarbons ,SOIL remediation ,ECOLOGICAL risk assessment ,SEWAGE irrigation ,ECOLOGICAL zones - Abstract
Purpose: Taiyuan has been an important energy-producing and heavy chemical industry base in China since the 1950s. The soil PAH content, spatial distribution, sources, and ecological risk in different functional zones in Taiyuan were studied. This is aimed at revealing the pollution characteristics in the long-term accumulation of soil PAHs in different functional areas of provincial industrial capitals represented by Taiyuan. This study also provides a valuable reference for safeguarding human health and pollution treatment. Materials and methods: Seventy surface soil samples were collected from six districts in Taiyuan. The content of the 21 different PAHs was determined by GC–MS. According to field investigation of the current land use and the geographic environment around the sample sites, the 70 samples were classified into five categories: industrial zone, sewage irrigation area, cultivation area, residential areas, and ecological zone. The spatial agglomeration characteristics of the PAHs were analyzed using Moran's index. The main emission sources of the PAHs were explored using diagnostic ratios (DRs) and a positive matrix factorization (PMF) model. The impact of the PAHs on the ecological environment was evaluated using risk quotient values (RQs). Results and discussion: The average content of Σ21PAHs in different functional areas was in the order of industrial zones (2376 ± 1395 ng·g
−1 ) > residential areas (2109 ± 1950 ng·g−1 ) > cultivation areas (830.3 ± 494.7 ng·g−1 ) > sewage irrigation area (794.5 ± 634.9 ng·g−1 ) > ecological zones (392.6 ± 232.1 ng·g−1 ). The proportion of 3–5-ring PAHs and seven carcinogenic PAHs in Σ21PAHs were approximately 87–90% and 32–37%, respectively. High to high spatial cluster of PAHs was mainly distributed in industrial zones. PMF analysis indicated that the sources of the PAHs in the five functional zones were mainly coal burning and traffic emissions (approximately 47–60%). The ecological risk assessment suggested that nearly 92% of the soil samples had medium–high ecological risk in industrial zones. Conclusions: The PAH content in 70 soil samples from Taiyuan obeyed log-normal distribution. There was a significant variation in soil PAH content in different functional areas. 3–5-ring PAHs were predominant. The soils of the industrial zones and residential areas were more severely contaminated with PAHs than those of the other soils. There were clear differences in sources and risks of the different functional areas. Therefore, remediation of soil contamination in Taiyuan should be considered. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
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29. Numerical study for one-dimensional non-isothermal transport of organic contaminant in the three-layer composite liner containing a defective geomembrane.
- Author
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Jiang, Wenhao, Li, Jiangshan, and Ge, Shangqi
- Subjects
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GEOSYNTHETIC clay liners , *THERMAL conductivity , *FINITE differences , *DIFFUSION coefficients , *ENGINEERING design - Abstract
• Non-isothermal transport model for organic contaminant in a three-layer composite liner containing a defective geomembrane is presented. • The impacts of temperature-dependent transport parameters as well as the multiple transport mechanisms are systematically considered. • Changes in diffusion coefficients and hydraulic conductivities with temperature accelerate the transport rate, while such a change for distribution coefficients slows it down. • The increase of temperature difference in the composite liner and the geomembrane defects density both reduce the engineering performance. • This study contributes to the optimization of the bottom composite liner's engineering design when they are non-isothermal. The non-isothermal case in bottom composite liners not only induces thermal diffusion behavior, but also alters transport parameters. To date, however, limited work has been done on this topic. The present research constructs a model for one-dimensional non-isothermal transport of organic contaminant in the three-layer composite liner containing a defective geomembrane (GMB), which for the first time systematically includes the impacts of temperature-dependent transport parameters, and also considers the multiple transport mechanisms. The developed model is then solved via finite difference, and its rightness is well-proven through comparisons with the two experiment results and the other calculation approaches. After that, the numerical analysis shows that the temperature-dependent transport parameters exert a combined effect on the transport process, in which changes in diffusion coefficients and hydraulic conductivities with temperature remarkably accelerate the transport rate, whereas such a change for distribution coefficients leads to an opposite trend. The barrier performance assessment suggests that the growth of temperature difference in the composite liner, as well as the GMB defects density, reduces the defined breakthrough time (t b) and increases the bottom transport flux. Moreover, 1 cm geosynthetic clay liner is noticed to extend t b by approximately 2.23 years, while 0.1 m compacted clay liner yields the increment of t b by about 12.1 years. These findings contribute to the reasonable evaluation of bottom composite liners' barrier performance at a non-isothermal environment, which could provide guidance for optimizing their engineering design. [ABSTRACT FROM AUTHOR] more...
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- 2025
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30. Synergistic effect of Fe and Ni on carbon aerogel for enhanced oxygen reduction and H2O2 activation in electro-Fenton process.
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Ye, Qian, Hunter, Timothy N., Xu, Hao, Harbottle, David, Kale, Girish M., and Tillotson, Martin R.
- Subjects
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OXYGEN evolution reactions , *IRON-nickel alloys , *OXYGEN reduction , *WASTEWATER treatment , *AEROGELS - Abstract
[Display omitted] • A novel FeNi alloy carbon aerogel cathode was developed for electro-Fenton system. • FeNi-CA showed high activity for electro-generation and in situ activation of H 2 O 2. • FeNi-CA exhibited broad pH efficacy and high reusability for ACT removal. • Oxygen evolution reaction created favorable pH conditions for cathodic reactions. • Anodic oxygen evolution eliminated the need for external aeration. A novel cathode, iron-nickel alloy modified carbon aerogel (FeNi-CA), was successfully synthesized and utilized as the cathode in an electro-Fenton process for acetaminophen degradation. The incorporation of Fe and Ni in the carbon matrix resulted in superior electrochemical characteristics and catalytic performance compared to Fe-CA and Ni-CA. The unique microstructure of FeNi-CA, including the presence of alloy nanoparticles, carbon defects, and abundant oxygen functional groups, enhanced 2e− oxygen reduction activity and electrocatalytic performance. This enabled FeNi-CA to exhibit a dual functionality of H 2 O 2 electro-generation and in situ activation. FeNi-CA demonstrated good performance over a wide pH range at a low current density of 4.44 mA/cm2. Under optimal conditions, 99.9 % of acetaminophen was removed with a reaction rate constant (k obs) of 0.054 min−1 through electro-sorption and oxidation processes. Importantly, a satisfactory degradation effect was achieved in the absence of external aeration. This work provides a potential wastewater treatment solution without the need for external aeration or additional chemical input by simultaneously achieving oxygen evolution reaction at the anode and oxygen reduction reaction at the cathode. Furthermore, FeNi-CA demonstrated good reusability performance with controlled metal leaching after five consecutive runs, suggesting its potential for sustained use in electro-Fenton processes over the long term. [ABSTRACT FROM AUTHOR] more...
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- 2025
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31. Heterogeneous Fe-Ni dual-atom catalysts coupled N-vacancy engineering for enhanced activation of peroxymonosulfate.
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Qin, Jiewen, Wang, Qian, Han, Bei, Jin, Chen, Luo, Cuihong, Sun, Yunqiang, Dai, Zhichao, Wang, Shoucui, Liu, Hongmei, Zheng, Xiuwen, and Hu, Zunfu
- Subjects
- *
ENVIRONMENTAL degradation , *ELECTRON density , *REACTIVE oxygen species , *DENSITY functional theory , *CHARGE exchange - Abstract
The integration of nitrogen vacancies (Nv) exhibits significant role in promoting the efficiency of single-atom catalysts (SACs). Herein, a novel dual SAC, FeNi-Nv/CN, was developed via immobilizing Fe-Ni dual atoms onto graphitic carbon nitride with Nv sites. The FeNi-Nv/CN could effectively activate peroxymonosulfate (PMS) and generate plentiful reactive oxygen owing to the excellent Fenton-like catalytic property of FeNi, which could facilitate the degradation of Orange II. Moreover, the Nv in FeNi-Nv/CN could augment electron density around Fe-Ni atomic pairs obviously, which was beneficial to strengthen the electron transfer process (ETP) and further improve the degradation efficiency of Orange II. The density functional theory (DFT) calculations and experimental results of FeNi-Nv/CN testified the robust synergistic capacity between dual single-atomic reaction sites and Nv. This work provided a valuable strategy for the construction of dual SAC and could be a promising candidate in the effective degradation of environmental contaminant. [Display omitted] • A high-efficiency FeNi-Nv/CN was prepared. • Catalytic mechanism of FeNi-Nv/CN DAC. • The synergistic effect between Fe-Ni dual center sites and Nv. [ABSTRACT FROM AUTHOR] more...
- Published
- 2025
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32. Application of Capacitive Deionization in Water Treatment and Energy Recovery: A Review.
- Author
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Bao, Shenxu, Xin, Chunfu, Zhang, Yimin, Chen, Bo, Ding, Wei, and Luo, Yongpeng
- Subjects
- *
WATER purification , *DEIONIZATION of water , *WATER softening , *WATER disinfection , *WATER supply , *WATER pollution - Abstract
Water resources are the basis for human survival and development. However, human beings face severe challenges of water pollution and freshwater shortage. With the critical advantages of low energy consumption, high efficiency, low cost, green and pollution-free, and renewable electrodes, capacitive deionization (CDI) has become an up-and-coming water treatment technology. After decades of development, the application of CDI has expanded from seawater desalination to many fields. However, the existing literature still needs a comprehensive overview of the multi-functional application of CDI technology in water treatment. Therefore, our work critically reviewed the latest research progress of CDI in water treatment to meet the technical requirements of various application fields. This paper first summarizes the various applications of CDI in water treatment, focusing on CDI's representative research results in heavy metal removal, organic contaminants removal, water softening, phosphate and nitrate removal, and water disinfection. In addition, we also discussed the latest research progress of energy recovery and energy consumption assessment for the CDI process. Finally, this paper discusses the challenges and future opportunities facing CDI technology. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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33. Comparative assessment of modified bentonites as retardation barrier: adsorption performance and characterization.
- Author
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Guo, Dongdong, Wan, Yong, Li, Jiangshan, Liu, Ruiqi, Liu, Lei, and Xue, Qiang
- Subjects
FOURIER transform infrared spectroscopy ,MONTMORILLONITE ,ADSORPTION (Chemistry) ,HYDROXYL group - Abstract
Modified bentonites for the anti-seepage system have been attracting global attention. At the same time, the performances of modified bentonite containing retardation barrier exposed to organic–heavy metal pollutants have not been fully reported. In this study, the adsorption performances (one of the key evaluation indicators of retardation barrier) of nine kinds of commonly used modified bentonites on multiple contaminants were comparatively investigated. The x-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses were also performed to unravel the adsorption mechanisms. Results show that the adsorption of modified bentonites on phenol and Pb(II) follows the order of SB-16 > PVA > CTAB > APAM > CTAB + PAC > PAC > CPAM > CTAB + PAC > CTAB + CPAM + APAM. Among all the samples, the bentonite modified with SB-16 showed the highest adsorption capacities for phenol and Pb(II). The surfactant molecules inserted in the interlayer space of montmorillonite increase the substrate spacing, which changes the structural properties of the bentonite from hydrophilic to hydrophobic and increases the adsorption of organic contaminants. On the other hand, the polymer has functional groups such as hydroxyl and carboxyl that can form a spatial three-dimensional cross-linking structure on the bentonite surface, providing more adsorption sites for heavy metal ions. These findings indicate the potential industrial applications of modified bentonite in a contaminant barrier system. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
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34. Electrokinetic Processes: Directions for Future Research and Constraints
- Author
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Silva, Karyn N. O., Paiva, Suelya S. M., dos Santos, E. V., Trevors, J., Series Editor, Rodrigo, M. A., editor, and Dos Santos, E. V., editor
- Published
- 2021
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35. A Systematic Review on Earthworms in Soil Bioremediation
- Author
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Francesca Tagliabue, Enrica Marini, Arianna De Bernardi, Costantino Vischetti, and Cristiano Casucci
- Subjects
vermiremediation ,phytoremediation ,bioaugmentation ,co-remediation ,Eisenia fetida ,organic contaminant ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Bioremediation techniques are increasingly popular in addressing soil pollution. Despite this, using earthworms as first actors or adjuvants in decontamination is an open and little-discussed field. This paper focuses on vermiremediation effectiveness alone or combined with other bioremediation methods, such as phytoremediation and bioaugmentation. Literature was collected following the PRISMA criteria, setting the search with the following keywords: “(vermiremediation) AND (bioremediation OR phytoremediation OR plant*) AND (bioaugmentation OR bacteria)”. The investigation was performed on Google Scholar, Science Direct, SciFinder and Web of Science databases. The article data were collected, compared, elaborated, graphically summarised and discussed to assess if the earthworms’ activities play a critical role in tackling several soil pollutions. Furthermore, the review aimed to identify the most promising techniques in the function of the xenobiotic examined: organic, inorganic or both. Any gaps and criticism were highlighted to facilitate future research in this study area. more...
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- 2023
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36. Recyclable and flexible Bi(Ho3+-Yb3+)OBr/g-C3N4 composite porous fiber for efficient water purification and real-time temperature sensing
- Author
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Li, Junhan, Li, Yue, Pun, Edwin Yue Bun, and Lin, Hai
- Published
- 2023
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37. NEW RAY ON REMEDIATION OF HIGH RINGS POLYCYCLIC AROMATIC HYDROCARBONS: REMEDIATION OF RAW PETROLEUM SLUDGE USING SOLIDIFICATION AND STABILIZATION METHOD.
- Author
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ROSLEE, NOOR FAIZA, MOHD KAMIL, NOR AMANI FILZAH, KADIR, AESLINA ABDUL, JALIL, ABDUL RAHIM, HAMZAH, NURHIDAYAH, NOOR, NORAZIAN MOHAMED, and SANDU, ANDREI VICTOR
- Subjects
PETROLEUM ,ANTHRACENE ,PORTLAND cement ,SOLIDIFICATION ,POLYCYCLIC aromatic hydrocarbons ,POLLUTANTS - Abstract
Solidification/Stabilization (S/S) method with cement as a binder to remediate metals in petroleum sludge has been successfully proven. However, this technique has not yet been explored to remediate organic contaminants since a high concentration of Total Petroleum Hydrocarbon (TPH) was also detected in the sludge. This study focuses on remediating 16 Polycyclic Aromatic Hydrocarbons (PAHs) compounds in raw petroleum sludge with Portland cement as a binder using the S/S method. The initial concentration of 16 PAHs in the raw sludge was first measured before the performance of the S/S method to remediate the PAHs were evaluated. The S/S matrices were tested for leaching behavior and strength after 7 and 28 days by air curing. The leaching test was measured using the Toxicity Characteristics Leaching Procedure (TCLP), and the remaining PAHs concentration in the matrices was analyzed using a Gas Chromatography-Mass Spectrometer (GC-MS). In the raw sludge, all 16 PAHs compounds were below the standard limit except for Benzo(a)anthracene, Benzo(a)pyrene, Dibenzo(ah)anthracene, and Indeno(1,2,3-cd_ pyrene), which are considered as high rings PAHs. The high rings PAHs show lower concentration in leachate than low rings PAHs, which indicates the potential of the S/S method in remediating high rings PAHs. The high sludge ratio in S/S matrices has shown that the percentage strength is increasing, similar to Portland cement. Therefore, this study contributed to the possibility of the S/S method in the remediation of PAHs in petroleum sludge by using only Portland cement as a binder. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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38. Characterisation of the chemo-mechanical behaviour of clays polluted by BTEX: a case study of benzene
- Author
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Hicham KAHLOUCHE, Abderrahim GHERIS, and Mohamed GUENFOUD
- Subjects
Contaminated clay ,Organic contaminant ,Benzene ,Chemo-mechanical coupling ,Laboratory tests ,Soil rheology ,Hydraulic engineering ,TC1-978 - Abstract
Abstract In chemo-mechanical coupling of clays, chemical phenomena are likely to have a stronger influence on the mechanical behaviour and mechanical actions can modify the chemical behaviour. The understanding of these different phenomena, taking into account the coupled mechanisms, is essential in the context of the problem of the durability of structures and works built on polluted sites. Thus, the laboratory characterisation of the chemo-mechanical behaviour of a clay contaminated by light hydrocarbon pollutant (BTEX: benzene) was carried out. First in the absence of pollutants, i.e., by the presence of water only, then under the influence of the pollutant, all in two stages: with no external stress, then under imposed external stress. This study presents an experimental protocol based on a series of uniaxial consolidation tests, specific oedometric tests and direct shear strength, this tests performed under controlled saturation conditions and in the presence of organic contamination by benzene. All results confirm the influence of pollutants in different concentrations on the mechanical behaviour of the soil. They show a strong increase in compressibility and a significant increase in swelling, the soil becomes more cohesive, low friction and less elastic. Furthermore, the results show that external load forces play a major role in modifying the behaviour of clay. more...
- Published
- 2021
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39. Biochar design for antibiotics adsorption via a hybrid machine-learning-based optimization framework.
- Author
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Li, Jie, Pan, Lanjia, Huang, Yahui, Liu, Xuejiao, Ye, Zhilong, and Wang, Yin
- Subjects
- *
STANDARD deviations , *CARBON-based materials , *BOOSTING algorithms , *PARTICLE swarm optimization , *BIOCHAR - Abstract
[Display omitted] • Two datasets for biochar production and application as adsorbent were complied. • A hybrid machine-learning-based optimization framework was developed. • Specific surface area (SSA) of biochar was the foremost for its adsorption ability. • Pyrolysis temperature and ash in feedstock dominated the SSA of biochar. • Pyrolysis conditions were optimized and feedstocks were screened for biochar design. Biochar is widely applied as an adsorbent for removing contaminants. Herein, two machine learning (ML) models for biochar preparation and adsorption application were trained based on the eXtreme Gradient Boosting algorithm. Then, the two models were combined by developing a hybrid ML-based optimization framework via Particle Swarm Optimization to design biochar for application requirements. The test determination coefficient for predicting specific surface area (SSA), total volume, and adsorption capacity of biochar were 0.85, 0.88, and 0.97 with root mean square error of 63.10 m2/g, 0.07 cm3/g, and 65.72 μmol/g, respectively. Moreover, SSA was the foremost and positive property of biochar for its adsorption capacity; and pyrolysis temperature and feedstock ash content were the two most important factors affecting SSA, among which the former was positively related and the latter had a negative impact. Optimization results indicated that pine wood pyrolyzed at 500–700 °C could prepare a biochar with higher antibiotic adsorption capacity. This work presents an intelligent strategy to design biochar for adsorbing target pollutants. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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40. Improvement strategies on application of covalent organic frameworks in adsorption, photocatalytic, and membrane processes for organic pollution removal from water.
- Author
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Asayesh-Ardakani, Elham, Rahmani, Maryam, Hosseinian, Akram, Ghaffari, Seyed-Behnam, and Sarrafzadeh, Mohammad-Hossein
- Abstract
[Display omitted] • Application of COFs in organic pollutant removal from water was extensively discussed. • Improvement strategies on adsorption, photocatalytic, and membrane processes are presented. • Perspectives about current challenges of COF in applications are proposed. Recently, covalent organic frameworks (COFs), as emerging structures produced by assembling organic building blocks via covalent bonds, have drawn great attention for water treatment due to their high surface area and pores, numerous functional groups, and excellent chemical stability. Applying appropriate functional groups and building units and making COF-based composites represented effective strategies to enhance removal efficiency. In the photocatalytic, membrane separation, and adsorption processes, these strategies can result in the production of more charge carriers and degradative species, controlling water flow and rejection, and selective adsorption of organic pollutants. In this comprehensive review, the synthesis and modification methods of COFs and the recent advancement of their application in the removal of organic pollutants from water by adsorption, photocatalytic, and membrane separation processes were highlighted. Finally, the current challenges and future perspectives in the application of COFs in these processes are discussed. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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41. Decontamination promotes the release of incorporated organic contaminants in hair: Novel insights into non-invasive biomonitoring.
- Author
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Qin, Rui-Xin, Cao, Xue, Zhang, Shi-Yi, Li, Hong, Tang, Bin, Liao, Qi-Long, Cai, Feng-Shan, Peng, Xian-Zhi, and Zheng, Jing
- Subjects
SODIUM dodecyl sulfate ,PERFLUOROOCTANOIC acid ,HAIR washing ,HAIR analysis ,TRITON X-100 - Abstract
Human hair is increasingly employed as a non-invasive biomonitoring matrix for exposure to organic contaminants (OCs). Decontamination procedures are generally needed to remove external contamination from hair prior to analysis of OCs. Despite various existing decontamination protocols, their impacts on internally incorporated (endogenous) OCs in hair remain poorly understood. This study aims to quantitatively assess the impact of decontamination procedures on endogenous OCs in hair, and investigate optimal decontamination processes and factors influencing the removal of endogenous OCs. In this study, guinea pig was exposed to 6 OCs (triphenyl phosphate (TPHP), tris(1,3-dichloro-2-propyl) phosphate (TDCPP), and tri-n-butyl phosphate (TNBP), bisphenol A (BPA), perfluorooctanoic acid (PFOA), and phenanthrene (PHE)), and 6 decontamination procedures with different solvents (methanol, n-hexane, acetone, ultrapure water, Triton X-100, and sodium dodecyl sulfate) were used to rinse exposed guinea pig hair. All OCs and three metabolites (diphenyl phosphate (DPHP), dibutyl phosphate (DBP), and bis(1,3-dichloro-2-propyl) phosphate (BDCPP)) were detected in the majority of washing solutions. The decontamination procedures apparently resulted in the release of endogenous OCs from hair. The percentages of residual OCs in hair exhibited a linear or exponential decrease with more washing cycles. Furthermore, the residuals of OCs in hair washed with organic and aqueous solvents showed negative correlations with molecular weight, polarizability, and their initial concentrations. Although these findings need to be validated with a broader range of OCs, the results obtained in this study provide compelling evidence that current hair decontamination procedures have significant impacts on the analysis of endogenous OCs in hair. Therefore, it is important to interpret quantitative data on hair OC concentrations with caution and to thoroughly consider each decontamination procedure during analysis. [Display omitted] • Guinea pigs' hair exposed to six OCs underwent six decontamination processes. • Decontamination facilitates release of endogenous OCs from hair. • Surfactants should be cautiously employed in hair decontamination. • Acetone and water washing have minimal impact on endogenous OCs. • OCs with higher MWs in hair are more vulnerable to the decontamination process. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
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42. Hierarchical Coating Nanoarchitectonics of Halloysite Nanotube with Polydopamine and ZIF-8 for Adsorption of Organic Contaminants.
- Author
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Yuan, Xianggen, Wei, Zongwu, Zhang, Zhenkun, and Liu, Haiyan
- Subjects
- *
POLLUTANTS , *ADSORPTION (Chemistry) , *SURFACE coatings , *DISCONTINUOUS precipitation , *HALLOYSITE , *METAL-organic frameworks - Abstract
Coating nanoparticles with metal–organic frameworks (MOFs) can lead to core–shell hybrid particles with synergetic functionalities of the respective components. Previous efforts have been dedicated to achieving homogeneous and smooth MOF coatings with featureless morphologies. Herein, using halloysite nanotubes (HNTs) coated with polydopamine (PDA) to confine nucleation and growth of ZIF-8 on the surface, we prepared rod-like core–shell HNT@PDA@ZIF-8 particles. The ZIF-8 coating has a hierarchical morphology consisting of nanoaggregates of densely packed and fused ZIF-8 nanoparticles. This was achieved by simply controlling the concentration of the MOF precursors. These hybrid MOF particles combine the classical large microporosities with meso- and macroporosities derived from such hierarchical structures, while has enhanced mechanical stability. HNT@PDA@ZIF-8 exhibits appreciated adsorption capacity for several organic contaminants in aqueous system, especially for Rhodamine B. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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43. Photoatalytic Degradation of Organic Pollutants in Water Under Visible Light by NH2‐MIL‐125(Ti‐Zr)@BiOClxI1‐x Composite Photocatalyst.
- Author
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Yu, Zhengming, Lv, Yunkai, Huang, Feng, Zhang, Fang, Shi, Qi, An, Ke, Fan, Tingting, Li, Gang, and Wang, Jing
- Subjects
- *
ORGANIC water pollutants , *VISIBLE spectra , *PHOTOCATALYSTS , *SILVER , *TRANSPORTATION rates , *LIGHT absorption , *SILVER phosphates - Abstract
Combining two different semiconductors to construct heterojunction is an effective solution to the problem of high recombination rate of photo‐generated carriers. In this work, for further improvement of the photocatalytic performance of NH2‐MIL‐125(Ti−Zr)@BiOCl, NH2‐MIL‐125(Ti−Zr)@BiOClxI1‐x was synthesized by doping BiOI. The influence of BiOI doping amount on the photocatalytic performance of organic pollutant Acid Red B (ARB) was explored. The experimental results showed that the existence of BiOI enhanced the absorption of visible light and further reduced the recombination rate of photo‐generated carriers, thus improved the photocatalytic performance. The characterization of NH2‐MIL‐125(Ti−Zr)@BiOClxI1‐x was performed by XRD, SEM, TEM, EIS, DRS UV‐Vis DRS, and PL. Compared with the photocatalyst NH2‐MIL‐125(Ti−Zr)@BiOCl, the composite photocatalyst NH2‐MIL‐125(Ti−Zr)@BiOCl0.8I0.2 demonstrated superior visible‐light photocatalytic activity. With the illumination time of 90 min, the degradation rate of ARB was 94.6 %. After 3 times of recycling, the degradation rate of ARB was 91 %. The results of free radical quenching experiments showed that the degradation of ARB by NH2‐MIL‐125(Ti−Zr)@BiOCl0.8I0.2 was attributed to the oxidation of ⋅O2− and h+. A preliminary discussion on the photocatalytic mechanism was made. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
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44. Activation of peroxydisulfate by MIL-101(Fe)/g-C3N4 for 2-chlorophenol–contaminated soil: parameter optimization by response surface methodology.
- Author
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Liu, Quanfeng, Yu, Jiang, Jiang, Yinying, Zhong, Chengwei, Ding, Senxu, Zhou, Peng, and Jin, Yuanxiao
- Subjects
RESPONSE surfaces (Statistics) ,ORGANIC soil pollutants ,SOIL degradation ,HYDROTHERMAL synthesis ,SOILS - Abstract
Purpose: Soil organic matter pollution is a serious threat to the human living environment. The purpose of this paper is to investigate the effect of MIL-101(Fe)/g-C
3 Npt>4 catalyzed peroxynitrite degradation of 2-chlorophenol in soil and to analyze the reaction mechanism and further to explore the optimal parameters of this reaction system with utilizing the mathematical model. Methods: MIL-101(Fe)/g-C 3 N4 was successfully obtained by hydrothermal synthesis method by growing MIL-101(Fe) on the surface of g-C3 N4 to catalyze the degradation of 2-CP (2-chlorophenol) in soil by sodium persulfate. The influence factors on the removal rate of 2-CP were analyzed by the response surface methodology (RSM) and combined with theoretical calculations. RSM can be used to model continuous variable surfaces with less data and determine the optimal level range. Results: MIL-101(Fe)/g-C3 N4 had a good catalytic performance due to its good catalytic properties and the adsorption of g-C3 N4 on 2-CP in the system and made the best removal rate of 2-CP increase to 91.2%. The correlation of model fitting results was significant, and the verification of its optimal parameters yielded results with an error of only 4.1%. Conclusion: Further studies revealed that SO4 •− and• OH were the reactive radicals, and SO4 •− was the dominant, which impelled Fe2+ and Fe3+ to interconvert in the complex system. Possible degradation pathways were derived by analyzing the intermediates. Generally, this experiment provides some ideas for future research of MOFs in soil organic pollutant removal systems. [ABSTRACT FROM AUTHOR] more...- Published
- 2022
- Full Text
- View/download PDF
45. A semi-analytical solution to organic contaminants transport through composite liners considering a single crack in CCL.
- Author
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Xie, Haijian, Ding, Hao, Yan, Huaxiang, Yang, Dandi, Lou, Zhanghua, Qiu, Zhanhong, and Chen, Yun
- Subjects
POLLUTANTS ,LAPLACE transformation ,GROUNDWATER pollution ,SOIL pollution ,ACOUSTIC emission testing ,ANALYTICAL solutions - Abstract
Compacted clay liners (CCLs) are extensively used as engineering barriers for groundwater and soil pollution. The existence of cracks/fractures in CCL caused by thermally induced shrinkage is reported to importantly damage the performance of the CCL. An analytical model is developed to study the effects of the cracks/fractures on the migration of organic contaminants through a composite liner system. Laplace transformation and Laplace inversion using the Stehfest method are adopted to derive the analytical solution, which is validated by the experimental data. The existence of crack shows a significant impact on the breakthrough curve and bottom flux of organic contaminants. Increasing the crack width from 1 to 25 mm results in an enhancement of contaminant bottom concentration by a factor of 280. Increasing the adsorption factor and degradation rate of contaminants can effectively improve the performance of the composite liner with cracks. The effects of degradation of contaminants on the breakthrough curve are found to be more significant for the case with a larger retardation factor. This may be due to the fact that increasing the retardation factor can significantly slow down the transport of contaminants, which may indirectly create a longer period for the degradation of contaminants. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
46. Remarkably enhanced piezo-photocatalytic performance of Z-scheme Bi2WO6/Black TiO2 heterojunction via piezoelectric effect.
- Author
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Shen, Wenjing, Li, Nan, Zuo, Shixiang, Wu, Mianmian, Sun, Guifang, Li, Qingfei, Shi, Minghao, and Ma, Jiangquan
- Subjects
- *
PIEZOELECTRICITY , *HETEROJUNCTIONS , *PHOTOCATALYSIS , *RHODAMINE B , *TITANIUM dioxide , *BASIC dyes - Abstract
Current photocatalytic efficiency is quite restricted due to serious e−- h + pairs recombination. Combining piezoelectric effect into photocatalysis is an effective strategy to improve catalytic performance. Here, a rationally designed Bi 2 WO 6 /Black TiO 2 (Bi 2 WO 6 /B–TiO 2) heterojunction to enable a high piezo-photocatalytic activity via piezoelectric effect is reported. The degradation efficiency of cationic dye Rhodamine B (RhB) over optimized Bi 2 WO 6 /B–TiO 2 reaches 98.43% in 60 min under simultaneous ultrasonication and sunlight, which is higher than the total of those by independent photocatalysis (54.23%) and piezocatalysis (26.33%). Moreover, this hybrid Bi 2 WO 6 /B–TiO 2 piezo-photocatalyst also shows promising degradation of anionic dye methyl orange (MO), methyl blue (MB) and antibiotics (diclofenac sodium, DCF) under sunlight and ultrasonication. A built-in polarization field is generated inside the Bi 2 WO 6 nanosheets by ultrasound, which can accelerate effective segregation of photogenerated e−- h + pairs in Bi 2 WO 6 and B–TiO 2 , thereby enhancing the overall activity of the heterojunction. Furthermore, radical trapping and photodeposition experiments, EPR and VB-XPS spectra directly prove that the Bi 2 WO 6 /B–TiO 2 heterojunction is a Z-scheme system. Finally, a Z-scheme piezo-photocatalytic mechanism for Bi 2 WO 6 /B–TiO 2 is rationalized. This work offers a promising way to design high-efficient catalysts by combining piezoelectric effect into photocatalysis. [ABSTRACT FROM AUTHOR] more...
- Published
- 2022
- Full Text
- View/download PDF
47. Potential ability of tobacco (Nicotiana tabacum L.) to phytomanage an urban brownfield soil.
- Author
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Di Lodovico, Eliana, Marchand, Lilian, Oustrière, Nadège, Burges, Aritz, Capdeville, Gaelle, Burlett, Régis, Delzon, Sylvain, Isaure, Marie-Pierre, Marmiroli, Marta, and Mench, Michel J.
- Subjects
URBAN soils ,TOBACCO ,BROWNFIELDS ,SOIL pollution ,POLYCYCLIC aromatic hydrocarbons ,SANDY soils ,TOPSOIL - Abstract
The ability of tobacco (Nicotiana tabacum L. cv. Badischer Geudertheimer) for phytomanaging and remediating soil ecological functions at a contaminated site was assessed with a potted soil series made by fading an uncontaminated sandy soil with a contaminated sandy soil from the Borifer brownfield site, Bordeaux, SW France, at the 0%, 25%, 50%, 75%, and 100% addition rates. Activities of sandblasting and painting with metal-based paints occurred for decades at this urban brownfield, polluting the soil with metal(loid)s and organic contaminants, e.g., polycyclic aromatic hydrocarbons, in addition to past backfilling. Total topsoil metal(loid)s (e.g., 54,700 mg Zn and 5060 mg Cu kg
−1 ) exceeded by seven- to tenfold the background values for French sandy soils, but the soil pH was 7.9, and overall, the 1M NH4 NO3 extractable soil fractions of metals were relatively low. Leaf area, water content of shoots, and total chlorophyll (Chl) progressively decreased with the soil contamination, but the Chl fluorescence remained constant near its optimum value. Foliar Cu and Zn concentrations varied from 17.8 ± 4.2 (0%) to 27 ± 5 mg Cu kg−1 (100%) and from 60 ± 15 (0%) to 454 ± 53 mg Zn kg−1 (100%), respectively. Foliar Cd concentration peaked up to 1.74 ± 0.09 mg Cd kg−1 , and its bioconcentration factor had the highest value (0.2) among those of the metal(loid)s. Few nutrient concentrations in the aboveground plant parts decreased with the soil contamination, e.g., foliar P concentration from 5972 ± 1026 (0%) to 2861 ± 334 mg kg−1 (100%). Vulnerability to drought-induced embolism (P50) did not differ for the tobacco stems across the soil series, whereas their hydraulic efficiency (Ks) declined significantly with increasing soil contamination. Overall, this tobacco cultivar grew relatively well even in the Borifer soil (100%), keeping its photosynthetic system healthy under stress, and contaminant exposure did not increase the vulnerability of the vascular system to drought. This tobacco had a relevant potential to annually phytoextract a part of the bioavailable soil Zn and Cd, i.e., shoot removals representing here 8.8% for Zn and 43.3% for Cd of their 1M NH4 NO3 extractable amount in the potted Borifer soil. [ABSTRACT FROM AUTHOR] more...- Published
- 2022
- Full Text
- View/download PDF
48. Enhancement of aqueous stability of NH2-MIL-101(Fe) by hydrophobic grafting post-synthetic modification.
- Author
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Fu, Jianwei, Wang, Lin, Chen, Yuheng, Yan, Deyi, and Ou, Huase
- Subjects
PHOTOCATALYSIS ,PHOTOCATALYTIC water purification ,X-ray photoelectron spectroscopy ,CHEMICAL bonds ,SURFACE energy ,CONTACT angle - Abstract
The development of water-stable metal-organic frameworks is a critical issue for their photocatalysis applications in water treatment. A phenyl-ethyl side chain with low surface energy was grafted into NH
2 -MIL-101(Fe) through a post-synthetic modification (PSM) method. As a result, a novel MIL-101(Fe)-1-(4-(ethyl)phenyl)urea (named MIL-101(Fe)-EPU) was synthesized. Basic morphology, crystal structure, and chemical bond features of MIL-101(Fe)-EPU were retained after PSM. Nitrogen X-ray photoelectron spectroscopy analysis confirmed the successful introduction of the phenyl-ethyl side chain, and this transformation increased its hydrophobicity and water stability. Contact angles of MIL-101(Fe)-EPU to water raised from 59.6 to 140.4°. And its structure maintained intact after 72 h water exposure, indicating higher stability than parent NH2 -MIL-101(Fe). In the photocatalysis reaction with visible light and oxidant donor (H2 O2 ), MIL-101(Fe)-EPU demonstrated a degradation efficiency of tetrabromobisphenol A with a reaction rate at 0.0313 min−1 . The predominant reaction mechanism was OH·oxidation. The acid condition was beneficial for this photocatalysis reaction and high stability was observed. Besides, photocatalysis efficiency, crystal structure, and chemical structures were all retained in different actual water mediums, suggesting high adaptability of MIL-101(Fe)-EPU. In general, hydrophobic group grafting using a PSM method endows MIL-101(Fe)-EPU the potentiality as photocatalyst for organic contaminant elimination from water. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
- Full Text
- View/download PDF
49. Effect of chloride ions on the simultaneous electrodialysis and electrochemical oxidation of mature landfill leachate.
- Author
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Bagastyo, Arseto Yekti, Sari, Putu Putri Indira, and Direstiyani, Lucky Caesar
- Subjects
LEACHATE ,CHLORIDE ions ,LANDFILLS ,LANDFILL management ,ELECTRODIALYSIS ,POLLUTANTS ,OXIDATION ,AMMONIUM ions - Abstract
An attempt has been made to improve the treatment efficiency of mature landfill leachate prior to the existing biological treatment. In this study, electrochemical oxidation (EO) was applied as a pre-treatment to remove organic contaminants and was simultaneously combined with electrodialysis (ED) to remove ionic constituents, such as ammonium and phosphate. A laboratory-scale electrochemical reactor was designed by utilizing a carbon graphite anode and a stainless steel cathode and separated by an anion exchange membrane (AEM) and cation exchange membrane (CEM), creating a three-compartment reactor. The oxidation of the organic pollutant would occur in the anodic compartment, while the targeted ammonium and phosphate ions would be migrated and accumulated in the central compartment. The treatment process was performed in a batch recirculation time of 12 h at a constant supplied current of 0.25 A and evaluated by means of the initial leachate pH (i.e., original pH value of 7.85; adjusted pH value of 5.50 and 8.50) and three different initial chloride concentrations. The higher the chloride concentration in the leachate, the higher the removal efficiency, except for total phosphate. The highest chemical oxidation demand (COD) removal was 86.2% (0.88 g W
−1 h−1 ), at an initial leachate pH value of 7.85 with the addition of 2 g L−1 of NaCl. Furthermore, under the same conditions, the ammonium, total phosphate, and chloride removals were 85% (0.44 g W−1 h−1 ), 89% (0.08 g W−1 h−1 ), and 83% (0.69 g W−1 h−1 ), respectively. Also, the concentrated ionic compounds in the central compartment can lower the energy consumption and can possibly be further treated or managed. [ABSTRACT FROM AUTHOR] more...- Published
- 2021
- Full Text
- View/download PDF
50. Characterisation of the chemo-mechanical behaviour of clays polluted by BTEX: a case study of benzene.
- Author
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KAHLOUCHE, Hicham, GHERIS, Abderrahim, and GUENFOUD, Mohamed
- Subjects
CLAY ,BENZENE ,SHEAR strength ,POLLUTANTS ,BUILDING sites ,SAPROPEL - Abstract
In chemo-mechanical coupling of clays, chemical phenomena are likely to have a stronger influence on the mechanical behaviour and mechanical actions can modify the chemical behaviour. The understanding of these different phenomena, taking into account the coupled mechanisms, is essential in the context of the problem of the durability of structures and works built on polluted sites. Thus, the laboratory characterisation of the chemo-mechanical behaviour of a clay contaminated by light hydrocarbon pollutant (BTEX: benzene) was carried out. First in the absence of pollutants, i.e., by the presence of water only, then under the influence of the pollutant, all in two stages: with no external stress, then under imposed external stress. This study presents an experimental protocol based on a series of uniaxial consolidation tests, specific oedometric tests and direct shear strength, this tests performed under controlled saturation conditions and in the presence of organic contamination by benzene. All results confirm the influence of pollutants in different concentrations on the mechanical behaviour of the soil. They show a strong increase in compressibility and a significant increase in swelling, the soil becomes more cohesive, low friction and less elastic. Furthermore, the results show that external load forces play a major role in modifying the behaviour of clay. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
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