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SSRN 2023年

作者： Yang, Nina Zuo, Jiane Xie, Zhenwen Men, Cong Zhang, Yanyan State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrialpollutants University of Science and Technology Beijing Beijing100083 China Chengdu Xingrong Environment Co. Ltd Chengdu610041 China Chengdu Drainage Co. Ltd Chengdu610011 China

Accurate quantification of microplastics is critical for assessing microplastic pollution in environmental samples, but the presence of organic matter interferes with the extraction of microplastics. At present, the effectiveness of organic matter digestion in samples still needs to be improved. In this study, three digestion reagents (Fenton, HNO3, and KOH) were first used to investigate the digestion efficiency of fertilizer samples produced from aerobic fermentation of food waste under different conditions. Subsequently, based on the results of this experiment, four dual-digestion protocols were developed using the Fenton (50 °C, 1 h) protocol as the initial digestion step. After meticulous selection, the optimal dual-digestion protocol was established: Fenton (50 °C, 1 h) + 65% HNO3 (60 °C, 1 h), achieving a high organic matter removal efficiency of 90.20 %. Importantly, it has a negligible impact on the physical properties and FTIR spectra of ten common plastic particles (excluding PA). This optimal dual-digestion protocol was used as a pretreatment step in combination with laser direct infrared (LDIR) and Fourier transform infrared (FTIR) for the detection of microplastics in fertilizer samples. Polyethylene (PE), Polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyurethane (PU), and polytetrafluoroethylene (PTFE) were detected with a total abundance of 6400 ± 799 items/kg. The present study introduces a reliable dual-digestion protocol for the effective removal of organic matter from organic-rich fertilizers, which will facilitate the subsequent extraction of microplastics from similar samples. © 2023, The Authors. All rights reserved.

关键词： Extraction

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In Situ Microplastic Sers Sensor Based on Flexible AU Tapes

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SSRN 2024年

作者： Sun, Zhenli Hong, Zijin Zhang, Yiyan Xie, Dan Duan, Fengkui Du, Jingjing MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and Engineering North China Electric Power University Beijing102206 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

A B S T R A C TMicroplastic analysis is crucial for human health. Thus far, research has primarily focused on investigating microplastics within aqueous environments, while in situ techniques for detecting microplastic particles in the atmosphere remain scarce. Herein, we introduce an innovative flexible sensor for the in-situ detection of microplastics in the atmosphere, using surface-enhanced Raman scattering (SERS) effects. Our sensor, composed of Au nanoparticle (AuNP) tapes fabricated via a novel "drop-coating and peel-off" method, demonstrates outstanding SERS performance. The size, morphology, and electromagnetic field enhancement of the AuNP tape were thoroughly characterized using multiple complementary techniques, including scanning electron microscopy, transmission electron microscopy, UV–vis spectroscopy, atomic force microscopy, and the finite-difference time-domain method. Owing to its exceptional transparency and sensitivity, the AuNP tape facilitates the reliable identification of multi-component microplastics in the atmospheric environment. This study bridges a critical gap in microplastic research and enhances our understanding of microplastic pollution. © 2024, The Authors. All rights reserved.

关键词： Scanning electron microscopy

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An Efficient Dual-Digestion Pretreatment Protocol for Extracting Microplastics from Organic-Rich Fertilizers

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SSRN 2023年

作者： Yang, Nina Zuo, Jiane Men, Cong Zhang, Yanyan Xie, Zhenwen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrialpollutants University of Science and Technology Beijing Beijing100083 China Chengdu Xingrong Environment Co. Ltd Chengdu610041 China Chengdu Drainage Co. Ltd Chengdu610011 China

Accurate quantification of microplastics is critical for assessing microplastic pollution in environmental samples, but the presence of organic matter interferes with the extraction of microplastics. At present, the effectiveness of organic matter digestion in samples still needs to be improved. In this study, three digestion reagents (Fenton, HNO3, and KOH) were first used to investigate the digestion efficiency of fertilizer samples produced from aerobic fermentation of food waste under different conditions. Subsequently, based on the results, four dual-digestion protocols were developed and after meticulous selection, the optimal dual-digestion protocol was established: Fenton (50 °C, 1 h) + 65% HNO3 (60 °C, 1 h), achieving a high organic matter removal efficiency of 90.20 % and virtually no impact on detection of common plastic pellets (excluding PA). This optimal dual-digestion protocol was used as a pretreatment step for the detection of microplastics in fertilizer samples. Polyethylene (PE), Polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), polyurethane (PU), and polytetrafluoroethylene (PTFE) were detected with a total abundance of 6400 ± 799 items/kg. The present study introduces a reliable dual-digestion protocol for the effective removal of organics from organic-rich fertilizers, which will facilitate the subsequent extraction of microplastics from similar samples. © 2023, The Authors. All rights reserved.

关键词： Infrared spectroscopy

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Uptake of polycyclic aromatic hydrocarbons (PAHs) from PAH–contaminated soils to carrots and Chinese cabbages under the greenhouse and field conditions

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Chemosphere 2024年 360卷 142405页

作者： Cao, Chun Wu, Yu-Yao Lv, Zhen-Ying Wang, Ji-Wei Wang, Chen-Wen Zhang, Hui Wang, Jun-Jian Chen, Huan College of Geography and Environmental Science Northwest Normal University Gansu Lanzhou730070 China Key Laboratory of Resource Environment and Sustainable Development of Oasis Gansu Lanzhou730070 China Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou730000 China University of Chinese Academy of Sciences Beijing100049 China College of Resources and Environment Chengdu University of Information Technology Chengdu610225 China Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China Department of Environmental Engineering and Earth Science Clemson University SC29634 United States

Polycyclic aromatic hydrocarbons (PAHs) with the properties of structural stability, semi–volatility, and hydrophobicity are toxic and persistent in environments;thus, their transport and fate in agroecosystems is essential for reducing PAH accumulation in the edible parts of crops. Here, we cultivated cabbages (Brassica pekinensis L.) and carrots (Daucus carota L.) in PAH–contaminated soils under the greenhouse and field conditions. After harvesting, we observed a 9.5–46% reduction in soil ∑PAH concentrations. There were 37% of bioconcentration factors (BCFbs) > 1 and 93% of translocation factors (TFab) > 1, while low–molecular–weight (LMW) PAHs had higher BCFbs than high–molecular–weight (HMW) PAHs. The PAH concentrations showed significant and positive correlations among soils, the belowground parts, and the aboveground parts. The toxicity equivalent concentration (TEQBaP) followed the order of cabbage (greenhouse) > cabbage (field) > carrot (greenhouse) > carrot (field), suggesting potentially higher health risks in cabbage relative to carrot and vegetables under the greenhouse relative to field condition. Our study suggested growing carrots under field conditions as a management strategy for reducing the risks of vegetables grown in PAH–contaminated soils. © 2024 Elsevier Ltd

关键词： Health risks

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Effect of Nh4+-N and Ammonia-Oxidizing Bacteria on Atenolol Removal During Simulated Riverbank Filtration

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SSRN 2022年

作者： Zhao, Jian Fang, Shangbiao Qi, Weixiao Liu, Huijuan Qu, Jiuhui Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Beijing Laboratory of Environmental Frontier Technologies School of Environment Tsinghua University Beijing100084 China

Riverbank filtration (RBF) is used worldwide for drinking water production and has been proven to remove organic micro-pollutants (OMPs) mainly by adsorption and biodegradation. Since NH4+-N is a common contaminant in surface water, its effect on ammonia-oxidizing bacteria (AOB) and the further role of AOB co-metabolism on OMPs degradation during RBF is unknown. Here, we selected atenolol as a typical OMP to explore the effect of NH4+-N concentration on atenolol removal and the role of AOB in atenolol biodegradation. The results showed that RBF is an effective barrier for atenolol mainly by biodegradation and adsorption. The ratio of biodegradation and adsorption to atenolol removal was related to atenolol ***, low concentration (500 ng/L) is almost completely removed by adsorption, while higher concentration (100 μg/L) is removed by biodegradation (51.7%) and adsorption (30.8%). Therefore, long-term difference in influent NH4+-N concentrations showed insignificant impact on atenolol (500 ng/L) removal as adsorption was the dominated removal mechanism. Besides, AOB enhanced the removal of atenolol (100 μg/L) as biodegradation played a more crucial role in removing atenolol under this concentration. Both AOB and heterotrophic bacteria can degrade atenolol during RBF, but the degree of AOB contribution is probably related to the concentration of atenolol exposure. The main reactions occurred during atenolol biodegradation possibly included primary amide hydrolysis, hydroxylation and secondary amine depropylation. About 90% of the bio-transformed atenolol was produced to atenolol acid. AOB could transform atenolol to atenolol acid by inducing primary amide hydrolysis but failed to degrade atenolol acid further under the conditions of this paper. This study provides novel insights regarding the roles played by AOB in OMPs biotransformation during RBF. © 2022, The Authors. All rights reserved.

关键词： Biodegradation

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Distribution Characteristics of Antibiotic Resistance Genes in Rainfall Runoff and Combined Sewer Overflow

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SSRN 2022年

作者： Pan, Xinrong Chen, Lei Zhang, Liping Zuo, Jiane College of Biology and Environmental Engineering Zhejiang Shuren University Hangzhou310015 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Rainfall runoff and combined sewer overflow (CSO) converge the organics, nutrients, and microbes from ground and wastewater. These pollutants will promote the proliferation and transformation of antibiotic resistance genes (ARGs). In this study, 4 rainfall runoff sites and 1 CSO outfall site were chosen and samples were taken during rainfall period. The ARGs were extracted from suspended solid (SS) and analysed by metagenomic sequencing. There were 888 ARG subtypes belonging to 17 ARG types were detected in all the samples. 11 of the ARGs were shared by 5 samples. The ARGs of multidrug type had the highest relative abundance. Its total relative abundance reached 1.07 copy ratio (copy of ARG/copy of 16S rRNA gene), and comprised 46.6% of all the ARGs. In all the samples, the CSO outfall had the highest total relative abundance (8.25×10-1 copy ratio) of ARGs, with a relative abundance range of 0-3.78×10-1 copy ratio. Further, the relationship between ARGs types and environmental factors was showed by RDA analysis. The results showed that COD concentration and bacteria abundance has a positive correlation to most ARGs, like multidrug, bacitracin, aminoglycoside, β -lactam, tetracycline, and sulfonamide. The relationship between ARGs subtypes were illustrated by network analysis. The multidrug resistance gene subtypes had the highest frequency of co-occurrence. This study sheds light on the occurrence and distribution of ARGs in non-point pollution and analyzed the relationship between ARGs and environmental factors. © 2022, The Authors. All rights reserved.

关键词： Antibiotics

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Distribution characteristics and environmental risk assessment following metal(loid)s pollution incidents at Southwest China mining site

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Transactions of Nonferrous Metals Society of China 2022年第12期32卷 4062-4075页

作者： Zhen-xing WANG Yun-jun YU Tian-tian YE Jiang-chi FEI Xin-yu SONG Jian-wei PENG Yao-yu ZHOU Hong-hua WU South China Institute of Environmental Sciences Ministry of Ecology and EnvironmentGuangzhou 510530China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control Guangzhou 510655China College of Resources and Environment Hunan Agricultural UniversityChangsha 410128China Guangxi Hezhou Dongrong Industrial Investment Group Co. Ltd.Hezhou 542899China

Limited information is available on long-term effects of metal(loid)s pollution incidents. Here, we analyze the distribution characteristics and quantification of elements in the Southwest China Keda mining site, which is one of the most populated sites and enables human health and ecological risk assessments of elemental pollution. The results on modified degree of contamination indicated that the soil and sediment were highly contaminated near Dahu *** health risk of children was almost 2.5 times that of adults in surface water, and 7.1 times in soil, ***, Tl and As were the main health risk contributors in surface water and soil, respectively, and As posed the highest ecological risk both in soil and sediment. These results indicated the potential impact of toxic metal(loid)s on the health of residents and environment. Hence, more scientific attention and proper management need to be paid to this environmental challenge in the future.

关键词： thallium arsenic mining site ecological risk health risk

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Regulating the Anchoring Structure to Enhance Thermostability of Ru Sub-Nano Clusters on Al-Based Supports for Efficient C–O Bonds Hydrogenolysis

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SSRN 2025年

作者： Xiao, Hongfei Zhang, Jianghao Ge, Shuchao Du, Chuo Jin, Yifan Xie, Yuanyuan Gai, Chao Fang, Jinhou Zhang, Changbin State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China Weifang Research Institute of Materials and Technology for Eco-environmental Protection Shandong Weifang261300 China

Heterogeneous catalyst with highly dispersed active metal species has found wide applications in the catalytic conversion of lignocellulosic biomass, owing to the inherent advantages in metal atom efficiency. However, it is still confronted with the challenge for developing efficient strategies to achieve enhanced thermostability of the highly dispersed metal under harsh conditions. In this work, Ru species are supported on two different aluminum-based materials (i.e., γ-AlOOH and γ-Al2O3) that provide distinct anchoring sites for Ru. Complementary characterizations combined with theoretical calculations demonstrate that, compared with triply bridging Al-O site of γ-Al2O3, the doubly bridging Al-O site of AlOOH exhibits more intense electronic interaction with Ru species. Consequently, this doubly bridging Al-O site as the anchoring site provides sufficient thermal resistance to immobilize the sub-nanometer Ru species under the high-temperature aging condition. The maintained high dispersion of Ru on AlOOH creates an electron-deficient Ru domain and sustains the high activity and selectivity in the production of aromatics during the hydrotreating of diphenyl ether. This work may contribute to the catalyst design for manipulating the surface-anchoring structure to regulate thermostability and dispersion of supported metal catalysts. © 2025, The Authors. All rights reserved.

关键词： Hydrolysis

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Cufe2o4@Ncnts-Functionalized Ceramic Microfiltration Membrane for Antibiotic Oxidation and Fouling control Via Heterogeneous Electro-Fenton Reaction

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SSRN 2024年

作者： Zhang, Zixin Huang, Guohe Li, Yongping Yao, Yao Zhang, Peng Chen, Xiujuan Ren, Shaojie Luo, Yifei Zhang, Yuanzheng State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China State Key Joint Laboratory of Environmental Simulation and Pollution Control China-Canada Center for Energy Environment and Ecology Research UR-BNU School of Environment Beijing Normal University Beijing100875 China Environmental Systems Engineering Program University of Regina ReginaSKS4S 0A2 Canada Institute for Energy Environment and Sustainable Communities University of Regina ReginaS4S 0A2 Canada Department of Civil Engineering The University of Texas at Arlington ArlingtonTX United States Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China College of Environmental Science and Engineering North China Electric Power University Beijing102206 China

Herein, we reported an electrocatalytic ceramic microfiltration membrane functionalized with CuFe2O4 nanoparticles supported by nitrogen-doped carbon nanotubes (NCNTs). The synergistic catalysis between Fe and Cu induced a continuous ·OH generation. The active Fe(II) and Cu(I) sites decomposed the in-situ generated H2O2 into ·OH. The electron transfer from the external circuit and Cu(I) to Fe(III) drove the regeneration of Fe(II). The interfacial electron transfer from CuFe2O4 to NCNTs decreased the electron density of Fe and Cu, thus facilitating the redox cycles of Fe(III)/Fe(II) and Cu(II)/Cu(I). Furthermore, the Fe and Cu sites at the interface of CuFe2O4 and NCNTs displayed a superior ability to non-interface sites in producing ·OH. At near-neutral pH, the electrocatalytic membrane delivered excellent tetracycline removal kinetics (0.0134 min-1) and significantly alleviated the organic fouling occurring on the membrane. These findings shed new light on the development of new-generation membranes with catalytic oxidation capabilities for water treatment. © 2024, The Authors. All rights reserved.

关键词： Antibiotics

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The Significant Influence of Pre-Oxidation with Potassium Permanganate on Coagulation of Humic Acid and its Membrane Fouling Behavior

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SSRN 2023年

作者： Yang, Min Li, Kun Wang, Tianyu Liu, Ruiping Hu, Chengzhi Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China

In this study, we systematically explore coagulation behavior, ultrafiltration membrane fouling behavior and the mechanism involved in for weak acid, neutral and alkaline condition, respectively, during the process of pre-oxidation of potassium permanganate and coagulation of aluminum chloride to remove humic acid (HA). The KMnO4 pre-oxidation significantly enhances flocs formation, and the flocs size increases from 82 to 122μm at pH 5.5, from 63 to 185μm at pH 7.0 and from 0 to 75μm at pH 8.5, respectively. Pre-oxidation could efficiently convert macromolecule HA to small molecule, and HA between 3kDa and 30kDa has the fastest reaction rate with KMnO4, then comes HA over 30kDa, and the HA under 3kDa has the slowest reaction rate. The enhanced coagulation at pH 5.5 is attributed to the aluminum speciation change after pre-oxidation along with the generated Mn2+ damaging the electric double layer structure. And for pH 8.5 it is mainly caused by the in-situ MnO2 as combination nuclei during pre-oxidation. Besides, for pH 7.0, the combined effect of in-situ MnO2 and aluminum speciation change both contribute to improvement of the coagulation. What’s more, the enhanced Al coagulation by pre-oxidation of KMnO4 also helps alleviate the membrane fouling, and a much rougher surface with larger flocs forms after KMnO4-aided Al coagulation humic acid filtration. This study provides an alternative perspective on the mechanism of pre-oxidation coagulation process. © 2023, The Authors. All rights reserved.

关键词： Coagulation

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