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SSRN 2023年

作者： Yang, Luhan Zhang, Tao Gao, Yanxia Li, Dairui Cui, Rui Gu, Cheng Wang, Lei Sun, Hongwen School of Environmental Science and Engineering Sun Yat-Sen University Guangzhou510275 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China MOE Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and Engineering Nankai University Tianjin300071 China School of Environmental Science and Engineering Sun Yat-Sen University 135 Xingang West Street Guangzhou510275 China

Global electronic waste (e-waste) generation continues to grow. The various pollutants released during precarious e-waste disposal activities can contribute to human oxidative stress. This study focused on oxidation outcomes (oxidative DNA damage and lipid peroxidation) among individuals who had elevated urinary concentrations of known e-waste-related pollutants (heavy metals, polycyclic aromatic hydrocarbons (PAHs), organophosphorus flame retardants (OPFRs), bisphenols (BPs), and phthalate esters (PAEs). We gathered data from 129 individuals living near e-waste dismantling sites in China, and then developed an explainable machine learning framework to quantitatively identify the co-exposure effects of e-waste-linked pollutants on human oxidative stress. Approximately 23% and 18% of the variance in oxidative DNA damage and lipid peroxidation, respectively, was explained by exposure to OPFRs, BPs, PAHs, PAEs, and heavy metals. Exposure to heavy metals demonstrated the most significant effect on oxidative stress, followed by exposure to PAHs and PAEs (for oxidative DNA damage) and exposure to BPs, OPFRs, and PAEs (for lipid peroxidation). The interactions between different pollutant classes were weak, while the interactive effects between congeneric pollutants were strong. We have also developed an intelligent analysis system for e-waste pollutants, which enables more efficient processing of large-scale datasets and dynamic model training in rapidly changing environments. © 2023, The Authors. All rights reserved.

关键词： Esters

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Screening of metal-modified biochars for practical phosphorus recovery

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Science of the Total Environment 2024年 956卷 177342页

作者： Li, Man Xie, Qian Xu, Fangxi Zhang, Yan Zhuang, Zechao Xu, Jiawei Xiang, Hai Li, Yongfu Cai, Yanjiang Chen, Zuliang Yu, Bing State Key Laboratory of Subtropical Silviculture Zhejiang A&F University Hangzhou311300 China Zhejiang A&F University Hangzhou311300 China Zhejiang Taizhou Ecological and Environmental Monitoring Center Taizhou318000 China Department of Chemistry Tsinghua University Beijing100084 China Jiangsu Key Laboratory of Numerical Simulation of Large Scale Complex Systems and School of Chemistry and Materials Science Nanjing Normal University Nanjing210023 China Fujian Key Laboratory of Pollution Control and Resource Reuse School of Environmental and Resource Sciences Fujian Normal University Fujian Province Fuzhou350007 China

The utilization of metal-modified biochars (MBCs) for practical phosphorus recovery has attracted significant research interest recently. However, the optimal choice of metals and modification methods for MBCs remains unclear. This study addresses this gap by comparing the phosphate adsorption capabilities of various MBCs using real municipal wastewater. The results show that zinc-modified biochar exhibits superior phosphate adsorption compared to biochars modified with calcium, magnesium, aluminum, and iron. Specifically, zinc-modified biochar prepared through metal-mediated biomass pyrolysis with alkaline soaking (ZnBC-OH) demonstrates the highest adsorption capacity, achieving 36.6 mg P/g in wastewater with a phosphate concentration of 5 mg P/L. This performance surpasses that of previously reported non-lanthanide modified biochars and is comparable to lanthanide-modified biochars. Mechanistic investigations reveal that the exceptional performance of ZnBC-OH is due to the presence of highly dispersed ZnO sites, which facilitate the formation of Zn3(PO4)2·4H2O precipitation, effectively retaining phosphate. Furthermore, a techno-economic analysis indicates that using ZnBC-OH in a fixed-bed column system can reduce phosphate levels from 6 mg L−1 to below 0.5 mg L−1 at a cost of 1.834 USD per ton of secondary treated wastewater, underscoring its promising application potential. © 2024 Elsevier B.V.

关键词： Wastewater treatment

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A Dual-Mofs (Fe and Co)/G-C3n4 Heterostructure Composite for High-Efficiently Activating Peroxymonosulfate in Degradation of Sertraline in Water

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SSRN 2022年

作者： Luo, Jun Ding, Chengcheng Gan, Yonghai Guo, Yang Cui, Yibin Sun, Cheng Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment of the People’s Republic of China Nanjing210042 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

A dual-MOFs (Fe and Co)/g-C3N4 heterojunction composite was constructed and used to activate peroxymonosulfate (PMS) for degrading sertraline (SER). The composites showed outstanding catalytic activity with 100% of SER removal efficiency in 120 min. At the same time, the amount of catalyst, concentration of PMS and environmental pH on the degradation for SER were investigated in detail. The main degradation products and pathways of SER were analyzed by Gaussian theory calculation and high-performance liquid chromatography-mass spectrometry (HPLC-MS). Based on the free radical quenching experiments and electron paramagnetic resonance (EPR) characterization analysis, it was confirmed that •OH and SO4•- were produced in the catalytic reaction process, and explained catalytic mechanism elaborately. The improvement of catalytic activity was attributed to synergistic effect of MOF-Fe nanoparticles, microporous structure and heterojunction, which promoted electron transfer efficiency and circulation of high efficiency catalytic center. © 2022, The Authors. All rights reserved.

关键词： Free radicals

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Biomimetic Cytotoxicity control of Select Nitrogenous Disinfection Byproducts in Water

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SSRN 2024年

作者： Zhan, Yuehao Gan, Wenhui Chen, Xiaohong Liu, Bingjun Chu, Wenhai Hur, Kyu Dong, Shengkun Guangdong Engineering Technology Research Center of Water Security Regulation and Control for Southern China China School of Civil Engineering Sun Yat-sen University Guangzhou510275 China Southern Laboratory of Ocean Science and Engineering Zhuhai519000 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China 3-2-9 Yushima Bunkyo Ward Tokyo113-0034 Japan

Nitrogenous disinfection byproducts (N-DBPs) in water are carcinogenic, teratogenic, and mutagenic. In this work, we developed a biomimetic reduction approach based on the cysteine thiol that destructed the highly toxic select nitrogenous haloacetamides (HAMs) and haloacetonitriles (HANs) while effectively controlling the cytotoxicity of the degradation products to serve as a basis for further technological applications. Mechanisms on toxicity control were elucidated. Results showed that though being both effective, the degradation and cytotoxicity control of HAMs were more efficient than HANs. The cytotoxicity of the chlorinated, brominated, and iodinated HAMs and HANs was reduced to 1/4-1/400 of the original after biomimetic reduction using reasonable concentration ratio. Through a combination of thiol-specific reactivity, dehalogenation, and quantitative structure-activity relationship analyses, the major toxicity control mechanisms were found to be the reductive dehalogenation of the N-DBPs. The halogenated functional groups on the N-DBPs had a more pronounced effect than the amide and nitrile groups on the cytotoxicity and detoxification. Patterns of toxicity interaction variations with DBPs concentrations were identified to detect possible synergistic cytotoxicity interactions under various combinations of HAMs and HANs in the presence of the cysteine thiol. Results could benefit future N-DBPs control efforts. © 2024, The Authors. All rights reserved.

关键词： Cytotoxicity

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Spatiotemporal Occurrence and Driving Factors of Microplastics in Urban Road Dust: A Super-Large City-Scale Study

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SSRN 2023年

作者： Fan, Yifan Zheng, Jinglan Xu, Wanlu Zhang, Qiji Chen, Nianhao Wang, Hui Qian, Xin Wang, Guoqiang State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing210023 China Nanjing University of Information Science & Technology Nanjing210044 China Co. Ltd. Beijing100000 China Faculty of Geographical Science Beijing Normal University Beijing100875 China

Microplastics issue have raised public concern. However, people are not very aware of the threat in their living space, the urban environment. Road dust is one of the main sources of environmental microplastics, and thus an ideal window to reveal their occurrence pattern. The differences of urban function zones, urban infrastructure, and natural condition may pose complex effects driving the characteristics of microplastics in urban road dust simultaneously, but rare reports studied these features at a city scale. In this study, we used Nanjing, a super-large city in eastern China, as the research area, and conducted a two-seasons investigation to explore the spatiotemporal pattern of microplastics in urban road dust. The abundance of microplastics in road dust in Nanjing reached 143.3 ± 40.8 n/m2, fragments and tire wear particles whose size © 2023, The Authors. All rights reserved.

关键词： Microplastic

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Monitoring of plankton diversity in Dianchi Lake by environmental DNA technology 3

Monitoring of plankton diversity in Dianchi Lake by environm...

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3rd International Conference on Green Energy and Sustainable Development, GESD 2020

作者： He, Liwei Zhang, Lijuan Yang, Jianghua Zhao, Zheng Zhou, Xiaohua Feng, Qing Zhang, Xiaowei Xu, Shan Environmental Protection Collaborative Research Center Kunming University Kunming650214 China Kunming River and Lake Ecological Health Assessment and Restoration Academician Workstation Kunming650214 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

Surveys of zooplankter and phytoplankton through environmental DNA (eDNA) and metagenomic technology across Dianchi Lake and the estuary of inflowing rivers was conducted, to evaluate the microbial diversity of Dianchi Lake and the estuary of four in flowing rivers. Diversity of plankton and the similarity of dominant species results revealed that the dominant eukaryotic phytoplankton in Dianchi Lake was Bacillatiophyta. The Shannon diversity index values of phytoplankton and zooplankton ranged from 3.68 to 18.36 and 0.54 to 2.49, respectively. The main genus taxa in the Dianchi Lake were similar with the inflowing river. The distribution map of Shannon diversity index gave overall insight into the variation of plankton diversity. The research proved that the eDNA technology was effective in biodiversity monitoring in aquatic ecosystem, and the inflowing river may impose an adverse influence on the ecosystem health of Dianchi Lake. © Published under licence by IOP Publishing Ltd.

关键词： Plankton

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Spatiotemporal Occurrence and Characteristics of Microplastics in the Urban Road Dust in a Megacity, Eastern China

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SSRN 2023年

作者： Fan, Yifan Zheng, Jinglan Xu, Wanlu Zhang, Qiji Chen, Nianhao Wang, Hui Qian, Xin Wang, Guoqiang State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing210023 China Co. Ltd. Beijing100000 China Nanjing University of Information Science & Technology Nanjing210044 China Faculty of Geographical Science Beijing Normal University Beijing100875 China

The pervasive issue of microplastics pollution has garnered public attention, yet urban residents remain largely unaware of the threat within their living spaces. Urban road dust, a primary reservoir for microplastics, offers an insightful perspective into their occurrence and characteristics. This study investigated the spatiotemporal dynamics of microplastics in the urban road dust in Nanjing, a megacity in eastern China. The abundance of microplastics in the road dust measured 143.3 ± 40.8 particles/m2, with predominant fragments and suspected tire wear particles, particularly those below 100 µm. Significant spatial variations were observed across urban functional zones, with commercial and heavy industrial areas experiencing the highest microplastic pollution. Analysis identified 29 polymer types, with polystyrene (PS), polyamide (PA), and polyvinylidene difluoride (PVDF) prevailing. Light industrial zones exhibited slight contamination but with diverse polymer components. Redundancy analysis and variation partitioning revealed that urban functional zoning, 7-day accumulated precipitation, and monthly PM2.5 primarily influenced the occurrence and characteristics of microplastics in urban road dust. This study enhanced our comprehension of microplastics pollution in urban environments, offering novel insights for effective urban environmental management and enhancement. © 2023, The Authors. All rights reserved.

关键词： Roads and streets

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Rheological properties of food waste and micron-scale particle strategies for enhancing mixing performance in anaerobic digestion: Insights into rheology and numerical simulation

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Environmental Research 2025年 279卷 121699页

作者： Xing, Xu Li, Zongsheng He, Chenzhi Guo, Yanyan Zhang, Guofang Zhao, Youcai Zhou, Tao The State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University 1239 Siping Road Shanghai200092 China Shanghai200092 China Tianfu Yongxing Laboratory Chengdu610213 China Jiangsu Environmental Engineering Technology Co. Ltd Jiangsu Nanjing210019 China Shanghai Urban Development Research Institute Co. Ltd Shanghai200030 China Hangzhou Xiaoshan Environmental Investment Development Co. Ltd Hefei231100 China

The rheological properties of food waste (FW) have emerged as a pivotal bottleneck impeding the stable operation and mixing performance of anaerobic digestion systems. This work systematically evaluated the rheological properties of FW and integrated computational fluid dynamics (CFD) numerical simulation to investigate the mixing performance of high-solid FW with micron-scale particle sizes. Results demonstrated that typical FW exhibited shear-thinning characteristics, and the rheological behavior of high-solid FW aligned with the Herschel-Bulkley model. The investigation of influencing factors indicated that reducing total solids, increasing temperature, and decreasing particle size could substantially decrease FW viscosity. Simultaneously, organic components exerted significant regulatory effects on the rheological properties. Starch and animal proteins markedly enhanced the viscosity and consistency, while lipids and legume proteins decreased viscosity and enhanced fluidity. A quantitative relationship between the consistency coefficient and organic components of FW was established. CFD simulations revealed that micron-sized particles effectively improved flow field distribution, reducing the dead zone ratio by 3.7 % and lowering the UI from 0.673 to 0.608. This work investigated the rheological properties of FW and the mixing performance of anaerobic digestion systems from a rheological perspective. The aim is to overcome efficiency and stability bottlenecks, thereby offering engineering guidance for optimizing anaerobic digestion processes and enhancing the resource recovery of municipal solid waste. © 2025 Elsevier Inc.

关键词： Municipal solid waste

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Stabilization of nanoscale zero-valent iron in water with mesoporous carbon(n ZVI@MC)

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Journal of Environmental Sciences 2019年第7期31卷 28-33页

作者： Junming Shi Jing Wang Wei Wang Wei Teng Wei-xian Zhang State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University School of Chemical Science and Engineering Tongji University

Two challenges persist in the applications of nanoscale zero-valent iron(nZVI) for environmental remediation and waste treatment: limited mobility due to rapid aggregation and short lifespan in water due to quick oxidation. Herein, we report the nZVI incorporated into mesoporous carbon(MC) to enhance stability in aqueous solution and mobility in porous media. Meanwhile, the reactivity of nZVI is preserved thanks to high temperature treatment and confinement of carbon framework. Small-sized(～16 nm) nZVI nanoparticles are uniformly dispersed in the whole carbon frameworks. Importantly, the nanoparticles are partially trapped across the carbon walls with a portion exposed to the mesopore channels. This unique structure not only is conductive to hold the nZVI tightly to avoid aggregation during mobility but also provides accessible active sites for reactivity. This new type of nanomaterial contains ～10 wt% of iron. The nZVI@MC possesses a high surface area(～ 500 m^2/g) and uniform mesopores(～ 4.2 nm) for efficient pollutant diffusion and reactions. Also, high porosity of nZVI@MC contributes to the stability and mobility of nZVI. laboratory column experiments further demonstrate that nZVI@MC suspension(～4 g Fe/L) can pass through sand columns much more efficiently than bare nZVI while the high reactivity of nZVI@MC is confirmed from reactions with Ni(II). It exhibits remarkably better performance in nickel(20 mg/L) extraction than mesoporous carbon, with 88.0% and 33.0%uptake in 5 min, respectively.

关键词： Mesoporous carbon Nanoscale zero-valent iron Mobility Porous media Heavy metal removal

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Three-Dimensional Charge Carrier Transport Channel Enhanced Photocatalytic H2o2 Production in Pure Water Over G-C3n4

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SSRN 2023年

作者： Ma, Jun Gou, Shuyuan Wang, Chuan Gong, Zehan Wang, Qian Li, Xiaoting Chen, Xianjie Wang, Jun Zhu, Yongfa College of Chemistry and Materials Science Sichuan Normal University Chengdu610068 China Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing China State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Department of Chemistry Tsinghua University Beijing100084 China

Photocatalytic H2O2 generation over polymeric carbon nitride (g-C3N4) always suffers from the easy recombination of charge carriers. Herein, g-C3N4 with three-dimensional charge carriers transport channel was constructed to facilitate charge carrier transport and separation through introducing cyano group in the intralayer and doping alkali metals between the interlayer as well. The optimum H2O2 accumulation concentration reached 164.60 µM under visible-light irradiation for 3 h in pure water with a formation rate constant of 160.90 uM h-1, being 17.2 times higher than the pristine g-C3N4. The apparent quantum yield reached 14.52% at 420 nm, exceeding most of the metal-free catalysts reported to date. The significantly improved photocatalytic performance was ascribed to the 3.2-fold higher charge carrier transport and separation efficiency. Therefore, our present work would pave the way for the design of catalysts with fluent transport channels of charge carriers © 2023, The Authors. All rights reserved.

关键词： Rate constants

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