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SSRN 2023年

作者： Chen, Yanrui Zhang, Xingran Li, Fang Ma, Jinxing Wang, Zhiwei College of Environmental Science and Engineering Textile pollution controlling Engineering Centre of Ministry of Ecology and Environment Donghua University Shanghai201620 China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education School of Ecology Environment and Resources Guangdong University of Technology Guangzhou510006 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai Institute of Pollution Control and Ecological Security School of Environmental Science and Engineering Tongji University Shanghai200092 China

Biofouling remains to be one of major obstacles for membrane-based technology in water and wastewater treatment, calling for the development of antibiofouling membranes. For the traditional release-killing strategy, uncontrollable release of biocides and thus a short lifetime as well as the potentially environmental risk are thorny issues for the modified membranes. Herein, hydrophilic hydrogel multilayers with controllable thickness at nanometer scale on a poly(vinylidene fluoride) (PVDF) microfiltration membrane were constructed via layer-by-layer (LbL) self-assembly of non-drug-resistant antimicrobial peptides (AMPs) and alginate. The AMPs/alginate multilayers modified membranes exhibited enhanced hydrophilicity, well-controlled pore size distribution and prominent antimicrobial ability against Escherichia coli and Staphylococcus aureus. The strong interaction of AMPs and alginate imparted by the gel network enabled the slow release rate of AMPs in water phase (i.e., 1.79 ± 0.07 μg/cm2 d of initial release rate and 0.55 ± 0.03 μg/cm2 d of steady release rate). Long-term antibiofouling tests showed that the AMPs/alginate modified membranes with ten multilayers (MSA10) exhibited a significantly reduced transmembrane pressure increase rate of 0.81 ± 0.01 kPa/d which was much lower than that of the control membranes (1.80 ± 0.20 kPa/d). Furthermore, the AMPs/alginate multilayers modified membranes revealed high stability suffering from long-term operation and chemical cleaning cycles. The novel AMP/alginate-incorporated modifying method provides a new dimension to enhance antibiofouling performance of membranes for water and wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Peptides

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Evolutional Solid Phase and Solid-Liquid Interface Uranium Immobilization Mechanisms by Nanoscale Zero-Valent Iron and Enhanced Uranium Stability control Strategy

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SSRN 2022年

作者： Hua, Yilong Li, Donghan Zou, Jinglan Wang, Wei Wu, Xiaoyan Zhang, Xiaowen Liu, Qing Zhao, Guodong Li, Mi Zhang, Wei-Xian Yang, Jianping School of Resource Environment and Safety Engineering University of South China Hunan Hengyang421001 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China United Laboratory of Heavy Metal Pollution Control and Resource Reuse University of South China Hunan Hengyang421001 China Hunan Key Laboratory of Pollution Control and Resource Reuse University of South China Hunan Hengyang421001 China State Key Laboratory of Pollution Control College of Environmental Science and Engineering Tongji University Shanghai200092 China

Uranium is a carbon dioxide free nuclear energy, and uranium-contained wastewater poses serious chronic health effects toward human. Nanoscale zero-valent iron (nZVI) separates uranium from wastewater with ultrafast kinetic, high capacity and selectivity. However, the dynamic interfacial uranium binding mechanisms and its stability, controlled by the phase transformation of nZVI, is important but poorly understood. After a long-term reaction, the fresh nZVI was oxidized and transfromed to ferrihydrite and then lepidocrocite and hematite. Analysis for the structures and valence states of U, Fe species indicated that the dominate U(VI) uptake mechanism changed from Fe 0 induced reduction to adsorption as nZVI transformed to iron (oxyhydr)oxides. Density functional theory calculation revealed that uranyl formed corner-sharing configurations on the surface of iron nanoparticles, and some uranium ions prefer to incorporate into the structure of lepidocrocite than hematite during the crystallization processes of ferrihydrite. Meanwhile, 100~10000 μg/L uranyl ions were quickly captured, the residual uranium could be maintained at ~9.31 μg/L and the content of uranium in reacted iron nanoparticles reached ~24.16 wt%. Interestingly, the oxidization reduction potential (E h ) was a potential parameter to control uranium immobilization in the CSTR system, and the E h control strategy could be used to increase the fraction of U(IV)/U(V), sparingly soluble and highly stable, higher than 90%. The findings augment our understanding of U-nZVI reactions and guide nZVI technology to remedy real uranium-contained wastewater. © 2022, The Authors. All rights reserved.

关键词： Hematite

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Exploring the Interactions of Ti3c2tx, Ag, and Ti3c2tx/Ag with Human Serum Albumin: Insights into Conformational Changes and Biotoxicity Reduction

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SSRN 2023年

作者： Tan, Chunhu Zhang, Tingting Wang, Gongying Liu, Chang Wang, Lingling Li, Weihua Li, Jiansheng Lu, Rui Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University Hefei230601 China Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application State Key Laboratory of Applied Microbiology Southern China Institute of Microbiology Guangdong Academy of Sciences Guangzhou510070 China School of Environment and Energy Engineering Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu University Hefei230601 China

Ag nanoparticles are toxic and can accumulate in the human body or the environment, resulting in biotoxic effects. Ti3C2Tx, a new class of graphene-like 2D nanomaterials, is used in numerous applications due to its special physicochemical properties. There is great concern about the potential damage that this material may cause to the environment and human health. In this study, the interaction mechanisms of Ti3C2Tx, Ag and Ti3C2Tx/Ag materials with HSA were characterized using multispectral analysis and zeta potential measurements, respectively. The results showed that the effects of the three materials on the conformational changes of HSA were Ag > Ti3C2Tx/Ag > Ti3C2Tx in order. Hydrogen bonding and electrostatic interaction forces played an important role in the binding process of Ti3C2Tx and its complexes with HSA. Ag nanoparticles have a comparatively high level of biotoxicity and have a more significant effect on the conformational changes of proteins. Ti3C2Tx itself has biocompatibility and a large specific surface area. The biotoxicity of Ti3C2Tx/Ag complex is lower than that of Ag, indicating that the addition of Ti3C2Tx can reduce the biotoxicity of Ag nanoparticles, and Ti3C2Tx may be used as a carrier substance for Ag nanoparticles, which can reduce the toxicity of Ag while giving it unique properties similar to those of Ti3C2Tx, thus improve the biosafety of Ag nanoparticles in the application process. © 2023, The Authors. All rights reserved.

关键词： Fourier transform infrared spectroscopy

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Facile Synthesis of Cofe2o4@Bc Activated Peroxymonosulfate for P-Nitrochlorobenzene Degradation: Matrix Effect and Toxicity Evaluation

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SSRN 2022年

作者： Zhi, Zejian Wu, Di Meng, Fanyue Yin, Ying Song, Bing Zhao, Yan Song, Min Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Jiangsu Nanjing210096 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

p-Nitrochlorobenzene (p-NCB) is widely used in industry and poses a potential threat to the public health due to its persistence, carcinogenicity and mutagenicity. Herein, magnetic catalyst CoFe 2 O 4 @Biochar (CoFe 2 O 4 @BC) was synthesized by a facile sol-gel method, efficiently activating peroxymonosulfate (PMS) to degrade p-NCB. The synergistic effect of Fe and Co in well-dispersed CoFe 2 O 4 and the electron transfer promote the production of reactive oxygen species (ROS) (•OH, SO 4 •- and O 2 •- ), efficiently removing p-NCB enriched by CoFe 2 O 4 @BC. Under optimum conditions, the CoFe 2 O 4 @BC/PMS system could remove 89% of p-NCB from water, and the degradation efficiency could reach 80% in soil. Toxic chlorinated intermediates appeared during the degradation process and thus efficient dechlorination process can lower the toxicity of the reaction solution, which was also proved by the oxygen uptake inhibition experiment as well as zebrafish toxicity experiments. Furthermore, p-NCB degradation efficiency could be inhibited by Cl - , HCO 3 - , HPO 4 2- and humic acid (HA) through quenching effect or occupation of CoFe 2 O 4 @BC surface active sites while HPO 4 2- could also improve the efficiency by directly activating PMS. The CoFe 2 O 4 @BC/PMS system can be efficiently applied in the remediation of p-NCB pollution in water and soil. © 2022, The Authors. All rights reserved.

关键词： Toxicity

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Leaching behavior of phosphorous compounds from sewage sludge ash based on quantitative X-ray diffraction analysis

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Waste Disposal and Sustainable Energy 2020年第2期2卷 113-125页

作者： Pinjing He Xiaotong Zhang Fan Lü Liming Shao Hua Zhang Institute of Waste Treatment and Reclamation College of Environmental Science and EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Phosphorus(P)is an essential and limited *** sewage sludge ash(ISSA)contains a high amount of P,which can be recovered using chemical leaching ***,the recovery ratio depends on the speciation of P and the leaching *** this study,hydrochloric acid was used as a leaching agent,and the effects of the hydrochloric acid concentration,leaching time,temperature,and liquid-solid ratio on the P leaching ratio were ***,the co-leaching of macro-metals Ca,Al,Fe,and Mg was *** results showed that P leached rapidly within 30 min,where the leaching rate reached more than 80%and then gradually *** leaching concentrations of Ca and Mg had a significant correlation(correlation coefficient r^(2)>0.90),and both were leached *** and P had similar leaching patterns,where the leaching rates increased initially and then decreased with time at 0.2 mol/L *** to X-ray diffraction analysis and Rietveld refinement,the P in ISSA was mainly present in the forms of Mg_(3)Ca_(3)(PO_(4))_(4) and AlPO_(4).When leached using 0.2 mol/L HCl at 55℃ with a liquid-to-solid ratio of 20 L/kg,the AlPO_(4) and Fe_(3)(H_(2)O)_(3)(PO_(4))_(2) in ISSA dissolved initially and then precipitated on the surface of the solid phase,thereby impeding further P leaching.

关键词： Sewage sludge ash Acid leaching Phosphorous speciation Quantitative X-ray diffraction analysis Rietveld refinement

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Underestimated Associations between Extracellular Antibiotic Resistance Genes and Extracellular DNA (Edna)-Releasing Bacteria in Various Environments by an Ultra-Selective Edna Extraction Method

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SSRN 2022年

作者： Yuan, Qingbin Wang, Shangjie Chen, Yuying Li, Xiaohan Xu, Yisi Li, Ruiqing Wang, Yi Luo, Yi School of Environmental Science and Engineering Nanjing Tech University Nanjing211816 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The importance of existing extracellular DNA (eDNA) in various environments has been largely underestimated due to the deficiency of eDNA extraction methods, which are labor-intensive, extra experimental agents-dependent and are interfered by coexisting substances. An ultra-selective eDNA extraction method is developed in this study based on molecular imprinting technology. The resulting guanine imprinted beads are micron grade spheres with high capacity (384.6 mg/g) and speed (90% adsorption in 10 min) for DNA adsorption at variable lengths, including ultra-short DNA ( © 2022, The Authors. All rights reserved.

关键词： DNA

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Are Wastewater Treatment Plants As The Source of Microplastics in Surface Water and Soil?

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SSRN 2023年

作者： Wei, Haoyu Wang, Jian Pan, Suyi Ding, Hao Smith, Ken Yang, Zeyuan Liu, Jincheng Liu, Peng Guo, Xuetao Gao, Shixiang Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China Ministry of Agriculture College of Natural Resources and Environment Northwest A & F University Yangling712100 China Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of China Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210093 China The University of Arizona United States

Microplastics (MPs) are widely detected in wastewater treatment plants (WWTPs) and natural environment, while the relationship of MP pollution in both media is not fully understood. In this study, we investigated the occurrence of MPs in WWTPs and in surface water and soil, and critically formulated their relationship. Results showed although sewage treatment could effectively remove MPs (58.2%), the effluent is still the important source of MPs in the river, while sludge is not as important as the sewage as the source of MPs in the soil. Specifically, the dominant size ranges and type of MPs were 0-200 μm and PE detecting in all sewage, sludge, river and soil, respectively. The dominant shape of MPs in sewage and river was film. However, the shapes were different between sludge (52.1% of fibrous) and soil (40.6% of fragment). Overall, WWTP input and surface runoff were the main source of MP pollution in surface water, and the abrasion of agricultural films accounted for the MP pollution in soil. The findings revealed the distribution and interconnection of MPs in WWTPs and environmental media, which can help to trace the sources of MP pollution and assess the ecological risks in the environment. © 2023, The Authors. All rights reserved.

关键词： Microplastic

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Application of Sulfidated Microscale Zero Valent Iron to Degrade 1,1,2,2-Tetrachloroethane in Water and Soil

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SSRN 2021年

作者： Fan, Bo Li, Xiaoshuai Wang, Jiahao Hu, Jianhua Gong, Zhimin Shao, Shuai Zhu, Changyin Zhou, Dongmei Gao, Shixiang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

1,1,2,2-tetrachloroethane (1,1,2,2-TeCA) is a toxic chlorinated hydrocarbon that is commonly found in industrial wastewater, groundwater and soil environments. In this study, sulfidated microscale zero valent iron (S-mZVI) was prepared for the reductive degradation of 1,1,2,2-TeCA under ambient aerobic conditions. The results showed that S-mZVI could effectively degrade 1,1,2,2-TeCA and its dehydrochlorinated product trichloroethylene (TCE) in aqueous solution at pH ranging from 6 to 8, and was also more powerful in degrading the dichloroethylene products than untreated microscale zero valent iron (mZVI). The degradation rate of 1,1,2,2-TeCA increased with increasing S/Fe molar ratio (0.01-0.2) and reaction temperature (25-60°C). Further study found that S-mZVI not only performed as reductant to induce dechlorination, but also could activate oxygen to produce oxidative free radical hydroxyl radicals (such as • OH and O 2 •- ). Finally, the degradation of 1,1,2,2-TeCA and its byproducts in acidic and alkaline soils was examined, with nearly complete degradation being achieved within 24 h under S-mZVI and 50℃ conditions. This study provides valuable information for the practical application of S-mZVI in the remediation of halogenated hydrocarbon contaminated waters and soils. © 2021, The Authors. All rights reserved.

关键词： Degradation

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Is Biochar a Reliable Catalyst for Activating Persulfate? Damage of Biochar During Catalytic Process

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SSRN 2022年

作者： Wan, Jiang Wang, Gehui Liang, Weiyu Peng, Cheng Zhang, Wei Fu, Rongbing State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China

Biochar has been believed as a low cost and metal-free catalysts for persulfate activation. However, the performance decreases of biochar after participating in the reaction, and the extent of damage to biochar remain poorly understood due to its intricate carbon structure. In this study, cotton stalk and walnut shell biochar were used to activate peroxydisulfate (PDS) for sulfadimidine degradation, and multiple characterization methods were used to determine the damage of biochar. The comparative experiments of biochar, recycled biochar, and PDS corroded biochar in catalytic reaction showed that the performance of biochars decreased by 37.5%-65.3%. After participating in the catalytic reaction, the unstable carbon in biochar was lost, and the surface of cotton stalk biochar was oxidized, which reduced its affinity to organic matter. CO2 physisorption showed that the pore structure of biochars barely changed. However, for walnut shell biochar, its adsorption capacity of nitrogen decreased obviously. Moreover, electrochemical tests showed that the conductivity of walnut shell biochar was reduced, which may lead to a decrease in the efficiency of the non-free radical pathway. Overall, the influences of catalytic process on biochar cannot be ignored, so more efforts are needed to make biochar an efficient and sustainable PDS activator. © 2022, The Authors. All rights reserved.

关键词： Pore structure

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Electrically Driven Enhancement on Selective Adsorption of Nitrate from Wastewater: Synergism of Functional Groups and Micropores

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SSRN 2024年

作者： Ge, Yu Wang, Yue Chen, Yanqi Xu, Xinbing Liu, Zifan Yin, Zhonglong Dai, Yong Liu, Fuqiang Yang, Weiben Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing210023 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China School of Chemistry and Chemical Engineering Yancheng Institute of Technology Yancheng China

In the presence of coexisting ions, the limited selectivity hampers the application of NO3- adsorption. Herein, a series of NO3- adsorbents featuring adjustable degrees of functional groups and pore structures were synthesized to explore their structure-activity relationship at atomic level. The effects of pore sizes, functional groups, and applied voltage on the selective removal of NO3- were systematically investigated. Theoretical calculations and experiments confirmed that pore sieving effect and electrostatic attraction provided by functional groups synergically enhance NO3- selectivity. The applied voltage changes the interfacial microenvironment of adsorbent and improves the interfacial electron transmission, thus promoting NO3- transfer and enrichment on adsorbent surface. Meanwhile, increasing electrostatic attraction can not only increase the adsorption capacity but also improve the selective screening of anions by micropores. Driven by an external voltage of 1.2V, NO3- selectivity of ZIF-8-C-Q-2 nearly doubles. Under higher voltage, ZIF-8-C-Q-2 exhibits lower charge transfer resistance and higher ion diffusion capacity, which is conducive to capturing electrolyte ions (NO3-), thereby enhancing its adsorption capacity and selectivity. This study provides a novel insight into synergism of functional groups and micropores for selective adsorption of NO3in electrosorption mode. © 2024, The Authors. All rights reserved.

关键词： Adsorption

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