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SSRN 2022年

作者： Yuan, Qingbin Wang, Xiaolin Fang, Hui Cheng, Yuan Zhang, Xueying Mao, Daqing Luo, Yi College 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 Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and Engineering Nankai University Tianjin300071 China

Despite of key functions as valuable global resources and essential ecological zones interconnecting terrestrial/freshwater and marine habitats, little is known on profiles of antibiotic resistance in coastal mudflats, which is of significance to understand the overall dissemination of antibiotic resistance genes globally. In this study the characteristics of typical antibiotic resistance genes (ARGs), involving both intracellular (iARGs) and extracellular ARGs (eARGs) with different physical states (i.e., adsorbed by solid particles (a-eARGs) and freely present (f-eARGs)) were explored in over 1,000 km of coastal mudflats in Eastern China. Results showed that iARGs and eARGs of both free (f-eARGs) and adsorbed (a-eARGs) states were present. eARGs abundance (sum of a-eARGs and f-eARGs) were significantly higher than iARGs in coastal mudflat, and eARGs were more dominant than those of other habitats (i.e., cropland, seawater, river water and activated sludge). A-eARGs and f-eARGs were highly persistent as reflected by the high throughout based amplicon sequencing. ARGs abundance particularly for eARGs showed an increasing trend of spatial pattern from southern to northern coastal mudflats, reflecting an increased risk of antibiotic resistance dissemination. Despite of higher nutrients and smaller particle size that benefit bacterial survival in northern coastal mudflats, iARGs abundance was not higher than southern coastal mudflats. Rather, the higher salinity significantly increased the transform from iARGs to eARGs, and smaller particle size facilitated the persistence of eARGs in northern coastal mudflats. This study is the first to provide the integrated profile of ARGs of various physical states (iARGs, f-eARGs, a-ARGs) in coastal mudflats, and address the key function of coastal mudflats as eARGs reservoirs. © 2022, The Authors. All rights reserved.

关键词： Reservoirs (water)

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UV/H2O2 oxidation of tri(2-chloroethyl) phosphate: Intermediate products, degradation pathway and toxicity evaluation

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Journal of Environmental Sciences 2020年第12期32卷 55-61页

作者： Qiuyi Ji Huan He Zhanqi Gao Xiaohan Wang Shaogui Yang Cheng Sun Shiyin Li Yong Wang Limin Zhang School of Environment Nanjing Normal UniversityNanjing 210023China State Environmental Protection Key Laboratory of Monitoring and Analysis for Organic Pollutants in Surface Water Environment Monitoring Center of JiangsuNanjing 210036China State Key Laboratory of Pollution Control and Resources Reuse School of EnvironmentNanjing UniversityNanjing 210023China School of Environment Northeast Normal UniversityChangchun 130024China

Tri(2-chloroethyl) phosphate(TCEP) with the initial concentration of 5 mg/L was degraded by UV/H2O2 oxidation process. The removal rate of TCEP in the UV/H2O2 system was 89.1% with the production of Cl-and PO4^3- of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H2O2 system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^-1( R^2 = 0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO · and H2O and the oxidation reaction with H2O2 were found during the degradation pathway of 5 mg/L TCEP in the UV/H2O2 system. For the first time, environment risk was estimated via the "ecological structure activity relationships" program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H2O2 system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.

关键词： Tri(2-chloroethyl)phosphate(TCEP) UV/H2O2 Mechanisms Toxicity evaluation

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区域场地土壤跨介质污染物多源清单:中国场地土壤污染防治的新策略

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Science Bulletin 2024年第5期69卷 566-569页

作者：李晔何天豪丁方方李小飞黄晔何尔凯蔡虹明史沛丽柳检李岩曲瑞娟郑旺谢云峰刘杏梅赵玲刘敏 Key Laboratory of Geographic Information Science(Ministry of Education) School of Geographic SciencesEast China Normal UniversityShanghai 200241China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China College of Environmental Natural Resource Sciences Zhejiang UniversityHangzhou 310058China Technical Centre for Soil Agriculture and Rural Ecology and EnvironmentMinistry of Ecology and EnvironmentBeijing 100012China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjin 300072China State Key Laboratory of Pollution Control and Resources Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

China has experienced rapid economic development and industrialization during the past four decades,leading to widespread distribution of various types of industrial facilities[1].With the understanding of soil contamination induced by industrial sites and rapid urbanization,abandoned industrial sites are generally reclassified for urban land[2].The remained brownfield sites(the sites of abandoned,idle,or under used industrial and commercial facilities where expansion or redevelopment is hindered by environmental contamination)exhibit great health risks to the residents due to that pollutants were continuously discharged intothe surrounding environments[3].

关键词：土壤污染防治 environments facilities

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Application of a New Type of Liquid Film Dielectric Barrier Discharge Plasma Reactor in Rhodamine B Degradation: Performance Optimization, Degradation Mechanism and Pathways

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SSRN 2022年

作者： Sun, Yabing Zhao, Lixian Qiu, Rui Sun, Hao Feng, Jingwei State Key laboratory of Pollution Control & Resources Reuse School of the Environment Nanjing University Nanjing210046 China Department of Municipal Engineering School of Civil and Hydraulic Engineering Hefei University of Technology Hefei230009 China

The degradation pathways and mechanism of rhodamine B (RhB) by a new type of liquid film dielectric barrier discharge (DBD) plasma reactor was examined, and the DBD performance optimization was also discussed. The results showed that the atmosphere of the discharge area, the input power had a significant effect on the removal of RhB. After 21 min DBD plasma system treatment, about 90.2% of RhB was degraded under the experimental conditions: initial RhB concentration of 40 mg/L, input power of 125 W and initial pH of 6.78. The use of free radical scavengers proved that hydroxyl radicals play a key role in the degradation of RhB. In addition, the degradation intermediates of RhB were identified by liquid chromatography mass spectrometry, and possible degradation pathways were proposed. During RhB degradation, COD, BOD 5 and TOC was also relieved with extension of treatment time. The BOD 5 /COD of RhB solution increased from 0.0326 to 0.3867 after the treatment of DBD system, and the biodegradability is greatly improved. © 2022, The Authors. All rights reserved.

关键词： Dielectric barrier discharge

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Enhanced Photocatalytic Toluene Oxidation on Cn Species Modified Tio2: Nitrogen Doping state and Anti-Inactivation Mechanism

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SSRN 2023年

作者： Wan, Haiqin Zeng, Xiaoshan Shi, Bingqing Qian, Qiuhui Tong, Qing Zou, Weixin Gao, Bin Dong, Lin State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Jiangsu Key Laboratory of Vehicle Emissions Control Center of Modern Analysis Nanjing University Nanjing210023 China National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology School of Environmental Science and Engineering Suzhou University of Science and Technology Suzhou215009 China Department of Agricultural and Biological Engineering University of Florida GainesvilleFL32611 United States

The photocatalytic oxidation of toluene is limited by low mineralization and inactivation. Cheap carbon and nitrogen (CN) species on TiO2 provide an efficient strategy. CN species from the urea calcination in situ formed on TiO2 were denoted as UTx (x=0.5, 1, 2), and UT1 photocatalyst had the best performance of ca. 90% conversion and 85% mineralization of toluene in light(λ≥400 nm, RH= 20%), with keeping for at least 720 min. The excellent activity of UT1 photocatalyst was resulted from the observed interstitial nitrogen and CN species with triple bonds. Because easily forming interstitial nitrogen resulted in isolated states and more negative VBM to generate hydroxyl radicals, and CN species with triple bonds was beneficial for transferring electrons and opening benzene rings. Therefore, quinone intermediates on UT1 were oxidized to 3-hydroxyglutaric dialdehyde and deeply mineralized, while more accumulated benzaldehyde on TiO2 led to poorer stability. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Heterogeneous Electro-Fenton Catalytic Feocl@Ncnt/Ceramic Membrane Filtration for In-Situ Membrane Fouling control: Performance and Mechanism

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SSRN 2023年

作者： Zhang, Zixin Huang, Guohe Li, Yongping Chen, Xiujuan Yao, Yao Zhang, Peng Ren, Shaojie Li, Mengna Luo, Yifei Chen, Ning Feng, Renfei 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 Department of Civil Engineering University of Calgary 2500 University Drive NW CalgaryABT2N 1N4 Canada Institute for Energy Environment and Sustainable Communities University of Regina ReginaS4S 0A2 Canada Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China Canadian Light Source SaskatoonS7N 2V3 Canada

Homogeneous electro-Fenton (EF) technique is effective to mitigate membrane fouling through oxidizing organic foulants by hydroxyl radicals (HO·), but suffers from acid pH working environment (2.5 ~ 3.5), low iron recyclability, and iron sludge accumulation. Herein, we developed a heterogeneous EF catalytic membrane to overcome these problems. A FeOCl@NCNT-functionalized ceramic membrane (FeOCl@NCNT/CM) was prepared to control the membrane fouling caused by humic acid (HA). At near neutral pH (~ 6.0), the membrane enabled the in-situ generation of HO·. It also imparted an effective regeneration of Fe(II) through cathodic reduction and the electron transfer to Fe(III) from pyrrolic-N. The continuously generated HO· could oxidize the HA on/in the membrane. Moreover, electrostatic repulsion reduced the adhesion of negatively charged HA on the membrane and promoted their detachment from the membrane. In continuous electrification mode, the membrane showed a superior antifouling ability. The water flux of the FeOCl@NCNT/CM at an applied voltage of -2.2 V was 1.79 times as high as that without voltage. Both reversible and irreversible membrane fouling were greatly reduced, and the transition of membrane fouling mechanism from pore blockage to cake filtration was significantly delayed. In intermittent electrification mode, the membrane exhibited an excellent self-cleaning performance. The fouled membrane showed considerable water flux recovery ratios (> 95%) after the EF cleaning at -2.2 V. The excellent antifouling and self-cleaning properties, low energy consumption, good stability and reusability of the FeOCl@NCNT/CM make it promising for the in-situ control of membrane fouling in water and wastewater treatment. © 2023, The Authors. All rights reserved.

关键词： Membrane fouling

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Effects of iron(hydr)oxides on the degradation of diethyl phthalate ester in heterogeneous(photo)-Fenton reactions

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Journal of Environmental Sciences 2019年第6期31卷 5-13页

作者： Wenjuan Shuai Cheng Gu Guodong Fang Dongmei Zhou Juan Gao Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of Science University of Chinese Academy of Sciences State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University

This work studied the structural effects of hematite(α-Fe2 O3), 2-line ferrihydrite(HFO) and goethite(α-FeOOH) on diethyl phthalate ester(DEP) degradation. The results showed that the degradation of DEP was faster under 365 nm light irradiation than in the dark in the presence of iron(hydr)oxides. The apparent kinetic rates of DEP degradation followed the order HFO > goethite ≈ hematite in the dark and HFO > hematite > goethite under 365 nm light irradiation. Two pathways governed H2 O2 decomposition efficiency on iron(hydr)oxide surfaces:(1) forming UOH on inherent surface hydroxyl groups(Fe-OH) and(2) producing O2 and H2 O on the surface oxygen vacancies. X-ray photoelectron spectroscopy(XPS) analyses indicated that HFO not only has high Fe-OH content but also has high Vo content, resulting in its low H2 O2 utilization efficiency(η). DEP was degraded through hydrogen abstraction and deesterification, and the major products were(OH)2-DEP, mono-ethyl phthalate(MEP), OH-MEP,and phthalate acid(PA). The study is important in understanding the transformation of phthalate esters in top surface soils and surface waters under ultraviolet light.

关键词： Diethyl phthalate ester Iron(hydr)oxide Hydroxyl radical Heterogeneous Fenton reactions

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Application of Dielectric Barrier Discharge in Rhb Degradation: Performance Optimization, Degradation Mechanism and Pathways

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SSRN 2022年

The degradation pathways and mechanism of rhodamine B (RhB) by dielectric barrier discharge (DBD) plasma was examined, and the DBD performance optimization was also discussed. The results showed that the atmosphere of the discharge area, the input power and the gas flow rate had a significant effect on the removal of RhB. After 21 min DBD plasma system treatment, about 90.2% of RhB was degraded under the experimental conditions: initial RhB concentration of 40 mg/L, input power of 125 W and initial pH of 6.78. The use of free radical scavengers proved that hydroxyl radicals play a key role in the degradation of RhB. In addition, the degradation intermediates of RhB were identified by liquid chromatography mass spectrometry, and possible degradation pathways were proposed. This study showed that the DBD plasma can effectively remove RhB, which provided a new idea for the actual wastewater treatment. © 2022, The Authors. All rights reserved.

关键词： Flow control

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NOx storage and reduction assisted by non-thermal plasma over Co/Pt/Ba/γ-Al2O3 catalyst using CH_(4) as reductant

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Plasma Science and Technology 2021年第2期23卷 76-84页

作者： Tao ZHU Xing ZHANG Nengjing YI Haibing LIU Zhenguo LI Institute of Atmospheric Environmental Management and Pollution Control China University of Mining&Technology(Beijing)Beijing 100083People's Republic of China Solid Waste and Chemicals Management Technology Center China Ministry of Ecology and EnvironmentBeijing 100029People's Republic of China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300People's Republic of China State Key Laboratory of Organic Geochemistry Chinese Academy of SciencesGuangzhou 510640People's Republic of China

NOx storage and reduction(NSR)technology has been regarded as one of the most promising strategies for the removal of nitric oxides(NOx)from lean-burn engines,and the potential of the plasma catalysis method for NOx reduction has been confirmed in the past few *** work reports the NSR of nitric oxide(NO)by combining non-thermal plasma(NTP)and Co/Pt/Ba/γ-Al2O3(Co/PBA)catalyst using methane as a *** experimental results reveal that the NOx conversion of NSR assisted by NTP is notably enhanced compared to the catalytic efficiency obtained from NSR in the range of 150°C–350°C,and NOx conversion of the 8%Co/PBA catalyst reaches 96.8%at 350°***(O_(2))has a significant effect on the removal of NOx,and the NOx conversion increases firstly and then decreases when the O_(2)concentration ranges from 2%to 10%.Water vapor reduces the NOx storage capacity of Co/PBA catalysts on account of the competition for adsorption sites on the surface of Co/PBA *** is a negative correlation between sulfur dioxide(SO_(2))and NOx conversion in the NTP system,and the 8%Co/PBA catalyst exhibits higher NOx conversion compared to other catalysts,which shows that Co has a certain SO_(2)resistance.

关键词： non-thermal plasma NOx storage and reduction Co/Pt/Ba/γ-Al2O3 catalyst NOx conversion influence parameter

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Remediation of mercury-contaminated soils and sediments using biochar:a critical review

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Biochar 2021年第1期3卷 23-35页

作者： Qian Yang Yongjie Wang Huan Zhong State Key Laboratory of Pollution Control and Resources Reuse School of the EnvironmentNanjing University163 Xian Lin Da DaoNanjing 210023People’s Republic of China Key Laboratory of Geographic Information Science Ministry of EducationSchool of Geographic SciencesEast China Normal UniversityShanghai 200241People’s Republic of China College of Biological and Environmental Engineering Binzhou UniversityBinzhou 256600People’s Republic of China Environmental and Life Sciences Program(EnLS) Trent UniversityPeterboroughONCanada

The transformation of mercury(Hg)into the more toxic and bioaccumulative form methylmercury(MeHg)in soils and sediments can lead to the biomagnification of MeHg through the food chain,which poses ecological and health *** the last decade,biochar application,an in situ remediation technique,has been shown to be effective in mitigating the risks from Hg in soils and ***,uncertainties associated with biochar use and its underlying mechanisms ***,we summarize recent studies on the effects and advantages of biochar amendment related to Hg biogeochemistry and its bioavailability in soils and sediments and systematically analyze the progress made in understanding the underlying mechanisms responsible for reductions in Hg *** existing literature indicates(1)that biochar application decreases the mobility of inorganic Hg in soils and sediments and(2)that biochar can reduce the bioavailability of MeHg and its accumulation in crops but has a complex effect on net MeHg *** this review,two main mechanisms,a direct mechanism(e.g.,Hg-biochar binding)and an indirect mechanism(e.g.,biochar-impacted sulfur cycling and thus Hg-soil binding),that explain the reduction in Hg bioavailability by biochar amendment based on the interactions among biochar,soil and Hg under redox conditions are ***,the existing problems with the use of biochar to treat Hg-contaminated soils and sediments,such as the appropriate dose and the long-term effectiveness of biochar,are *** research involving laboratory tests and field applications is necessary to obtain a mechanistic understanding of the role of biochar in reducing Hg bioavailability in diverse soil types under varying redox conditions and to develop completely green and sustainable biochar-based functional materials for mitigating Hg-related health risks.

关键词： Biochar Methylmercury Soils Sediments Bioavailability

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