15 results on '"Niu, Dong-jie"'
Search Results
2. Study on the preparation of genipin crosslinked chitosan microspheres of resveratrol and in vitro release
- Author
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Zhang, Yue, Yu, Yi-feng, Shi, Xian-xian, Zhao, Shu-chun, Chen, Ai-bing, Huang, Dao-wei, Niu, Dong-jie, and Qin, Zhen
- Published
- 2013
- Full Text
- View/download PDF
3. Preparation and reactivation of magnetic biochar by molten salt method: Relevant performance for chlorine-containing pesticides abatement
- Author
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Dai, Shi-Jin, Zhao, You-Cai, Niu, Dong-Jie, Li, Qiang, and Chen, Yu
- Abstract
Molten salt has been regarded as a versatile and environmental-friendly method for the material preparation and waste destruction. In this work, molten FeCl3 was utilized for the generation of magnetic biochar (MBC) derived from simultaneous activation and magnetization of biomass. The sample characterization indicated that MBC had a rough surface with BET surface area of 404 m2/g and total pore volume of 0.35cm3/g. Highly dispersed Fe3O4 and nitrogen could be deposited on the surface, leading to an excellent magnetization property. The MBC exhibited a great 2,4-Dichlorophenol (2.4-DCP) and atrazine removal performance in solution with the maximum adsorption capacity achieved 298.12 mg/g and 102.17 mg/g. Kinetics results demonstrated that MBC adsorption met the Pseudo-first-order model better. Molten NaOH-Na2CO3 was provided for the re-activation of exhausted MBC. 2,4-DCP was firstly desorbed from the MBC and subsequently destructed by the active species in the melt medium. Chlorine can be captured in the molten alkaline medium from the XRD pattern of residues.The MBC could be easily recovered with a yield of 98.2% and fixed carbon content of 61.0% after the molten salt regeneration process. With no 2,4-DCP detected, 65.5% and 31.69% of initial Cl was found in washing water and residues with the molten NaOH-Na2CO3, respectively. After 4 cycles of regeneration and adsorption, 60.55%-72.22% of initial adsorption capacity can be kept. This preparation and regeneration method can be an effective way to reduce the risk of secondary pollution of chlorinated organic compounds during adsorbent regeneration. Implications: Molten salt (MS) is a salt or multiple salts with a low melting point, and has been applied in many sectors and is regarded as a crucial role in terms of energy, environmental, and resource sustainability. In our paper, magnetic biochar was prepared by one-step activation and magnetization of fir dust using molten FeCl3∙6H2O. Meanwhile, a regeneration method using molten alkaline salt was provided. Magnetic biochar generated in our study performed well in the 2,4-dichlorophenol and atrazine adsorption. After four cycles of regeneration and adsorption, 72.2% of initial 2,4-DCP adsorption capacity can be kept.
- Published
- 2018
- Full Text
- View/download PDF
4. Preparation and reactivation of magnetic biochar by molten salt method: Relevant performance for chlorine-containing pesticides abatement
- Author
-
Dai, Shi-jin, primary, Zhao, You-cai, additional, Niu, Dong-jie, additional, Li, Qiang, additional, and Chen, Yu, additional
- Published
- 2018
- Full Text
- View/download PDF
5. Preparation and reactivation of magnetic biochar by molten salt method: Relevant performance for chlorine-containing pesticides abatement.
- Author
-
Dai, Shi-jin, Zhao, You-cai, Niu, Dong-jie, Li, Qiang, and Chen, Yu
- Subjects
BIOCHAR ,NITROGEN ,FUSED salts ,MAGNETIZATION ,ADSORPTION (Chemistry) - Abstract
Molten salt has been regarded as a versatile and environmental-friendly method for the material preparation and waste destruction. In this work, molten FeCl3 was utilized for the generation of magnetic biochar (MBC) derived from simultaneous activation and magnetization of biomass. The sample characterization indicated that MBC had a rough surface with BET surface area of 404 m2/g and total pore volume of 0.35cm3/g. Highly dispersed Fe3O4 and nitrogen could be deposited on the surface, leading to an excellent magnetization property. The MBC exhibited a great 2,4-Dichlorophenol (2.4-DCP) and atrazine removal performance in solution with the maximum adsorption capacity achieved 298.12 mg/g and 102.17 mg/g. Kinetics results demonstrated that MBC adsorption met the Pseudo-first-order model better. Molten NaOH-Na2CO3 was provided for the re-activation of exhausted MBC. 2,4-DCP was firstly desorbed from the MBC and subsequently destructed by the active species in the melt medium. Chlorine can be captured in the molten alkaline medium from the XRD pattern of residues.The MBC could be easily recovered with a yield of 98.2% and fixed carbon content of 61.0% after the molten salt regeneration process. With no 2,4-DCP detected, 65.5% and 31.69% of initial Cl was found in washing water and residues with the molten NaOH-Na2CO3, respectively. After 4 cycles of regeneration and adsorption, 60.55%-72.22% of initial adsorption capacity can be kept. This preparation and regeneration method can be an effective way to reduce the risk of secondary pollution of chlorinated organic compounds during adsorbent regeneration. Implications: Molten salt (MS) is a salt or multiple salts with a low melting point, and has been applied in many sectors and is regarded as a crucial role in terms of energy, environmental, and resource sustainability. In our paper, magnetic biochar was prepared by one-step activation and magnetization of fir dust using molten FeCl
3 ∙6H2 O. Meanwhile, a regeneration method using molten alkaline salt was provided. Magnetic biochar generated in our study performed well in the 2,4-dichlorophenol and atrazine adsorption. After four cycles of regeneration and adsorption, 72.2% of initial 2,4-DCP adsorption capacity can be kept. [ABSTRACT FROM AUTHOR]- Published
- 2019
- Full Text
- View/download PDF
6. Lasing in dye-doped photonic crystals at the edge of fluorescence band gaps
- Author
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Niu Dong-jie, L Hao, Zhang Qing-yue, Zhao Qiu-Ling, and Wang Xia
- Subjects
Materials science ,business.industry ,Band gap ,Physics::Optics ,General Physics and Astronomy ,Optoelectronics ,Edge (geometry) ,business ,Fluorescence ,Lasing threshold ,Dye doped ,Photonic crystal - Abstract
Based on holographic lithography, layered dye-doped photonic crystals are fabricated in dichromated gelatin emulsions. Under pumping of 532 nm pulse laser, fluorescence spectrums of samples show up remarkable band gaps, and lasing is achieved at the edge of fluorescence band gap with pumping energy increasing. Furthermore, the effects on lasing of matching between the edge of band gap and the peak of fluorescence are studied. Lasing threshold becomes lower as the edge of band gap is closer to the peak of fluorescence. Otherwise, it is difficult for lasing. The study provides new idea and method for the development of super low-threshold photonic crystal laser.
- Published
- 2013
7. Fabrication of two-dimensional superposed microstructure by interference lithography
- Author
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Lü, Hao, primary, Zhao, Qiu-Ling, additional, Zhang, Qing-Yue, additional, Niu, Dong-Jie, additional, and Wang, Xia, additional
- Published
- 2012
- Full Text
- View/download PDF
8. Optimization of methane fermentation from effluent of bio-hydrogen fermentation process using response surface methodology
- Author
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Wang, Xing, primary, Niu, Dong-jie, additional, Yang, Xiao-shuang, additional, and Zhao, You-cai, additional
- Published
- 2008
- Full Text
- View/download PDF
9. Evolution and discrimination of ecological planning and its related conceptions.
- Author
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HE Xuan, MAO Hui-ping, NIU Dong-jie, and BAO Cun-kuan
- Abstract
Ecological planning is one of the most important tools in realizing city's sustainable development. The ecological planning in China was started in the 1980s, and on the basis of assimilating the existing theoretical and practical experiences from western countries, basically formed a theoretical system in accordance with the Chinese characteristics and acquired a series of practical results. This paper reviewed the research and development processes of China's ecological planning. It is considered that the study of our ecological planning was derived from the geographical principles of land resources ecological utilization, the ecological principles of complex ecological system theory, and the combination of these two principles. The ecological planning has experienced three research stages, i. e. , single-disciplinary exploration, multi-disciplinary and multi-perspective study (including landscape ecology, ecology and urban planning), and interdisciplinary and multi-disciplinary collaboration research. The ecological planning and the related conceptions, primary principles, main academic points, and representatives at each research stage were summarized, and through the discrimination of the basic conceptions of ecological planning and other related plans, it was pointed out that ecological planning is an general conception which includes land ecological planning, urban ecological planning, and eco-city planning, and the principles and theories of eco-logical planning should be integrated into, led and restricted the present planning system to promote the city's and regional sustainable development. [ABSTRACT FROM AUTHOR]
- Published
- 2013
10. Ecological demonstration activity and eco-civilization construction mode: Review and prospects.
- Author
-
MAO Hui-ping, HE Xuan, HE Jia, NIU Dong-jie, and BAO Cun-kuan
- Abstract
Ecological civilization is to normalize human development behaviors to harmonize the relationships between social and ecological development and eco-environment protection. In this paper, a comparative analysis was made on the ecological demonstration activities of ecological demonstration areas led by the Ministry of Environmental Protection, exemplar cities of national environmental protection, and ecological provinces, cities, and counties. It was considered that all the ecological demonstration activities had the problems of lacking pertinence of construction goals, disordered construction subjects, inefficient construction processes, and lacking continuous incentive mechanisms of assessment. In the meantime, through the analysis of the connotations of eco-civilization, the relationships between eco-civilization and eco-demonstration constructions were approached, and the eco-civilization construction mode was put forward in terms of construction goal, construction subject, and construction processes and assessment. The construction mode included the construction goal based on regional characteristics, the synergistic cooperation of construction subjects, the expanding ways of public participation, and the establishment of evaluation system for comprehensively measuring the 'actions and results'. [ABSTRACT FROM AUTHOR]
- Published
- 2013
11. [Evolution and discrimination of ecological planning and its related conceptions].
- Author
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He X, Mao HP, Niu DJ, and Bao CK
- Subjects
- China, Ecosystem, City Planning organization & administration, Conservation of Natural Resources, Ecology methods, Environment Design, Soil
- Abstract
Ecological planning is one of the most important tools in realizing city's sustainable development. The ecological planning in China was started in the 1980s, and on the basis of assimilating the existing theoretical and practical experiences from western countries, basically formed a theoretical system in accordance with the Chinese characteristics and acquired a series of practical results. This paper reviewed the research and development processes of China' s ecological planning. It is considered that the study of our ecological planning was derived from the geographical principles of land resources ecological utilization, the ecological principles of complex ecological system theory, and the combination of these two principles. The ecological planning has experienced three research stages, i. e., single-disciplinary exploration, multi-disciplinary and multi-perspective study (including landscape ecology, ecology and urban planning), and interdisciplinary and multidisciplinary collaboration research. The ecological planning and the related conceptions, primary principles, main academic points, and representatives at each research stage were summarized, and through the discrimination of the basic conceptions of ecological planning and other related plans, it was pointed out that ecological planning is an general conception which includes land ecological planning, urban ecological planning, and eco-city planning, and the principles and theories of ecological planning should be integrated into, led and restricted the present planning system to promote the city's and regional sustainable development.
- Published
- 2013
12. [Ecological demonstration activity and eco-civilization construction mode: review and prospects].
- Author
-
Mao HP, He X, He J, Niu DJ, and Bao CK
- Subjects
- China, Environment Design, Conservation of Natural Resources, Ecology standards, Ecosystem
- Abstract
Ecological civilization is to normalize human development behaviors to harmonize the relationships between social and ecological development and eco-environment protection. In this paper, a comparative analysis was made on the ecological demonstration activities of ecological demonstration areas led by the Ministry of Environmental Protection, exemplar cities of national environmental protection, and ecological provinces, cities, and counties. It was considered that all the ecological demonstration activities had the problems of lacking pertinence of construction goals, disordered construction subjects, inefficient construction processes, and lacking continuous incentive mechanisms of assessment. In the meantime, through the analysis of the connotations of eco-civilization, the relationships between eco-civilization and eco-demonstration constructions were approached, and the eco-civilization construction mode was put forward in terms of construction goal, construction subject, and construction processes and assessment. The construction mode included the construction goal based on regional characteristics; the synergistic cooperation of construction subjects, the expanding ways of public participation, and the establishment of evaluation system for comprehensively measuring the 'actions and results'.
- Published
- 2013
13. [Experimental study on stabilization of sewage sludge by MOC].
- Author
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Ma JL, Zhao YC, Niu DJ, and Chai XL
- Subjects
- Absorption, Excipients chemistry, Magnesium Chloride chemistry, Magnesium Oxide chemistry, Metals, Heavy chemistry, Sewage chemistry, Waste Disposal, Fluid methods
- Abstract
Magnesium oxychloride cement (MOC) was used for the stability agent in the stabilization experiments of sewage sludge. It is found that MgCl2 in MOC is a kind of water-absorbent, water absorption of MgCl2 can be achieved at 1.55 mL/g (per 100 g sludge). Meanwhile, some water in sludge can be combined with MOC in the hydration reaction and sludge moisture content can be reduced efficaciously. The crystal structure of 3 phase and 5 phase, which occurred in the hydration process, makes the sludge compressive strength as high as 85.14 kg/cm2. The best ratio of MOC/sludge is 3/100, and MgO/MgCl2 is 3/1. Mg-Si-Al gel system is formed with Si2+, Al3+, Cu2+ in the sludge under alkaline condition, and it plays an important role in the stabilization of the heavy metals in sludge. Leaching experiments of sludge show that heavy metal concentrations of Cu, Zn, Cd, Cr, As in lixivium from sludge are lower than leachability standard.
- Published
- 2009
14. [Effects of initial pH on hydrogen production from acid pretreated municipal sludge].
- Author
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Liu CQ, Zhang JS, Niu DJ, Chen WH, and Zhao YC
- Subjects
- Anaerobiosis, Fermentation, Hydrogen metabolism, Hydrogen-Ion Concentration, Sewage microbiology, Hydrochloric Acid chemistry, Hydrogen analysis, Sewage chemistry
- Abstract
A series of batch tests were conducted to investigate the effects of initial pH on bio-hydrogen production from acid pretreated municipal sludge. The pH of sludge was first adjusted to 2.0, 3.0, 4.0 and 5.0, stood by for 24 h in a refrigerator at 4 degrees C, then adjusted to pH 2.0-12.0 respectively before using as the substrates for batch experiments. The results showed that the acid pretreated sludge with initial pH 11.0 gave the highest hydrogen production, and the corresponding accumulative hydrogen for sludge (dry basis) pretreated at pH 2.0, 3.0, 4.0 and 5.0 were 0.59, 1.83, 0.50 and 0.56 mL/g respectively. Hence, it could be seen that the initial pH 11.0 for the acid pretreated sludge should be the optimum pH range for promoting the growth of dominant hydrogen-producing anaerobes, while inhibiting hydrogen-consuming anaerobes. Meanwhile it also could be concluded that both hydrogenogen and methanogen were inhibited at the initial pH 2.0 to 4.0 and 12.0, which resulted in a low hydrogen production. Although the hydrogenogen and methanogen could be promoted at the initial pH 5.0 to 9.0, the corresponding hydrogen production was still quite low.
- Published
- 2008
15. [Contrasting experiment of two types of MSW aerobic bioreactor landfill].
- Author
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Li B, Dong ZY, Zhao YS, Zhao YC, and Niu DJ
- Subjects
- Biodegradation, Environmental, Oxygen, Temperature, Water analysis, Water Movements, Bacteria, Aerobic metabolism, Bioreactors, Refuse Disposal methods
- Abstract
Bioreactor landfill is an emerging landfilling method, which represents the newest developing aspect of Municipal Solid Wastes (MSW) treatment. On basis of analyzing the merits and defects of present bioreactor landfilling methods, the paper improves these methods and combines organically aeration and leachate recirculation into a new reactor (called reactor A), which is contrasted with bare aerobic landfill (called reactor B). During the course of experiment, NH3, CH4, CO2, pH, temperature and electric conductivity in the two bioreactors were controlled and detected, meanwhile, COD, Fe3+, NH4(+) in the leachate were detected and analyzed. The paper researches on the wastes degradation and the COD, Fe3+ and NH4(+) removal of the two bioreactors, probes into the mechanics of wastes and leachate degradation. Finally the paper draws a conclusion that the effect of degrading wastes and leachate of bioreactor A is better than that of bioreactor B.
- Published
- 2005
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