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SSRN 2023年

作者： Xiao, Haoliang Chen, Zhuqi Ding, Jiaqi Zhang, Ning Ye, Zhimin Xiao, Zhonghua Wang, Songlin Xie, Pengchao Chen, Yongsheng Hubei Provincial Engineering Research Center for Water Quality Safety and Pollution Control Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan430074 China Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center Yangtze River Basin Ecological Environment Supervision and Administration Bureau Ministry of Ecological Environment Wuhan430010 China School of Civil and Environmental Engineering Georgia Institute of Technology AtlantaGA30332 United States Hubei Industrial Construction Group Co. Ltd Wuhan430076 China

In this study, the combined system of peroxymonosulfate and chloride (PMS/Cl−) was applied to chemically clean the irreversible humic acid-fouled polyethersulfone (PES) membranes. A 94% flux recovery and 96% resistance removal of the fouled membrane were reached after soaking for an hour in PMS/Cl− solution (10 mM/15 mM) at 25 oC under neutral conditions. The almost constant surface properties of virgin and cleaned membranes by characterization indicate the PMS/Cl− process can effectively remove irreversible foulants with minimal impact on membrane. The stability and durability of PMS/Cl− cleaned membranes were demonstrated by monitoring their separation performance and cleaning efficiency across multiple cycles. Diminution of the peaks centered in the region of fulvic-like and humic-like components, monitored under 3D-fluorescence, demonstrated that structural changes in hydrophobic substances dominated the foulant detachment. The presence of the PMS-catalyzed chlorination of the foulants was confirmed after detecting PMS and hypochlorous acid (HClO) concentrations in the combined system. Furthermore, lower toxicity was observed with the PMS/Cl− method compared to hypochlorite alone, as evidenced by monitoring halogenated by-product formation and acute toxicity. Overall, the novel chemical cleaning system exhibits promising prospects for the environmentally friendly removal of irreversible organic foulants in the practical water treatment process. © 2023, The Authors. All rights reserved.

关键词： Chemical cleaning

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Effective and Low-Toxicity: A Membrane Cleaning Method Using Peroxymonosulfate Catalytic Chlorination

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SSRN 2023年

In this study, the combined system of peroxymonosulfate and chloride (PMS/Cl−) was applied to chemically clean the irreversible humic acid-fouled polyethersulfone (PES) membranes. A 94% flux recovery and 96% resistance removal of the fouled membrane were reached after soaking for an hour in PMS/Cl− solution (10 mM/15 mM) at 25 oC under neutral conditions. The almost constant surface properties of virgin and cleaned membranes by characterization indicate that the PMS/Cl− process can effectively remove irreversible foulants with minimal impact on membrane materials. Diminution of the peaks centered in the region of fulvic-like and humic-like components, monitored under 3D-fluorescence for the cleaning solution, demonstrated that structural changes in hydrophobic substances dominated the foulant detachment. The presence of the PMS-catalyzed chlorination of the foulants in the cleaning process was confirmed after detecting PMS and hypochlorous acid (HClO) concentrations in the combined system. Furthermore, lower toxicity was observed with the PMS/Cl− method compared to hypochlorite alone, as evidenced by monitoring halogenated by-product formation and acute toxicity to Photobacterium phosphoreum T3. Overall, the novel chemical cleaning system exhibits promising prospects for the efficient and environmentally friendly removal of irreversible organic foulants in the practical water treatment process. © 2023, The Authors. All rights reserved.

关键词： Membrane fouling

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Aqueous production of sulfur-containing aerosols from nitroaromatic compounds and SO2 in wintertime urban haze

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Science Bulletin 2025年

作者： Yang, Ning Wang, Junfeng Jacob, Daniel J. Ye, Jianhuai Sheng, Ming Niu, Mutong Qin, Yiming Ge, Xinlei Sun, Yele Wang, Zifa Wang, Yuhang Wu, Fengchang Liu, Cong-Qiang George, Christian Fu, Pingqing Institute of Surface-Earth System Science School of Earth System Science Tianjin University Tianjin300072 China School of Emergency Management Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China John A. Paulson School of Engineering and Applied Sciences Harvard University CambridgeMA02138 United States School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China School of Energy and Environment City University of Hong Kong Hong Kong999077 China LAPC Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100029 China School of Earth and Atmospheric Sciences Georgia Institute of Technology AtlantaGA02115 United States State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China Université Claude Bernard Lyon 1 CNRS IRCELYON VilleurbanneF-69626 France

Nighttime aqueous oxidation of fossil fuel emissions is a significant source of atmospheric secondary organic aerosols. However, the underlying mechanism of the aqueous processing remains unclear. Utilizing ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry of water-soluble organic carbon samples, we present field observations that reveal the aqueous-phase conversion of nitroaromatic compounds (NACs) and sulfur-containing aerosols from fossil fuel combustion at high relative humidity during a severe haze event in Beijing in the winter of 2016. We have confirmed that the ring-breaking oxidation of NACs can generate nitrous acid in the aqueous phase, which rapidly oxidizes sulfur dioxide (SO2) to sulfate. Subsequently, reactions between sulfate and unsaturated compounds contribute to the formation of aliphatic organosulfates. Our results elucidate a molecular-level understanding of the aqueous production of sulfur-containing aerosols from NACs and SO2 in wintertime urban haze. © 2025 Science China Press

关键词： Sulfur dioxide

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Influence of Dense "Water Network" on the Variation of Pm 2.5 Concentration in the Twain-Hu Basin: Numerical Simulation of A Heavy pollution Event

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SSRN 2022年

作者： Zhu, Yan Bai, Yongqing Xiong, Jie Zhao, Tianliang Xu, Jiaping Zhou, Yue Hu, Weiyang Sun, Xiaoyun Hubei Meteorological Service Center Wuhan430205 China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy Rain China Meteorological Administration Wuhan430205 China Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and Technology Nanjing210044 China Jiangsu Climate Center Nanjing210044 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China

The rivers and lakes in the middle reaches of the Yangtze River Basin (MRYRB) form a unique underlying surface of dense "water network". However, the influence of such underlying surface on the regional atmospheric environment in inland humid regions is not fully understood. In this study, the WRF Model with Chemistry were used to simulate a heavy pollution event under stable weather conditions in the MRYRB. On this basis, the regulating effects of different types of lake groups, such as centralized big lakes (CBLs) and discrete small lakes (DSLs) on the variation of regional PM2.5 concentration in the Twain-Hu Basin (THB) were clarified. The results show that the underlying surface of dense "water network" in the THB generally decreases the regional PM2.5 concentration, but the influences of different lake-group types are not uniform in the spatial distribution. The CBLs can reduce the PM2.5 concentration over the lake and its surroundings by 6.24%–9.60%. The vertical impacts on PM2.5 are concentrated within 1.5 km, and the PM2.5 concentration can be reduced by 9%–14% under the height of 500 m. The ability of DSLs in reducing PM2.5 pollution is relatively weak, and the influences are between −1.75% and 1.17%. Thermal factor and water vapor related factors are the key meteorological factors affecting the variation of regional PM2.5 concentration over the underlying "water network" surface. The warming (humidification) effects of such underlying surface contribute positively (negatively) to the "purification" of air pollution, where the contribution of thermal factor is stronger. The relative contributions of thermal factors (water vapor related factors) are 52.48% (43.91%) for CBLs, and 65.96% (27.31%) for DSLs, respectively. The "purification" effect of the underlying surface with dense "water network" in the THB on regional air pollution highlights the importance of environmental protection of inland rivers and lakes in regional environmental governance. © 2022, T

关键词： Lakes

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The efficient electrochemical nitrate reduction to ammonia on nickel telluride/copper foam with electron-rich sites

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Journal of Environmental Chemical Engineering 2025年第4期13卷

作者： Yiyang Chen Jiawei Zhu Ningxuan Xue Xinyu Gai Da Teng Chen Wei Fengling Liu Zhaobing Guo Yalin Yu Pengxiang Qiu Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control (AEMPC) Collaborative Innovation Centre of Atmospheric Environment and Equipment Technology (CIC-AEET) School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing 210044 China Suqian University Suqian 223800 China Jiangsu Key Laboratory of E-waste Recycling School of Resources and Environmental Engineering Jiangsu University of Technology Changzhou 213001 China

Electrocatalytic reduction of nitrate (NO 3 - ) to ammonia (NH 3 ) provides a green and moderate alternative to the Haber-Bosch method. Yet, the NH 3 Faradaic efficiency (FE) is limited by the generation of byproducts and the occurrence of competitive hydrogen evolution reactions. The development of electrocatalysts for NO 3 - reduction to NH 3 with high activity and selectivity remains a significant challenge. Herein, we designed tellurides with electron-rich Ni sites grown on copper foam (Ni 3 Te 2 /Cu), which have been demonstrated to possess superior catalytic activity for electrochemical conversion of NO 3 - to NH 3 , with a maximum NO 3 - conversion rate of 100 % and the FE was 96.78 % at −0.49 V vs RHE and pH= 7. The experimental results confirmed that the excellent NO 3 - reduction activity was attributed to the outstanding characteristic of tellurides and the formation of electron-rich Ni sites. Theoretical calculations further indicated that the tight binding of Cu and electron-rich Ni promotes NO 3 RR activity.

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Application of multi-angle spaceborne observations in characterizing the long-term particulate organic carbon pollution in China

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Science of the Total Environment 2025年 958卷 177883页

作者： Hang, Yun Pu, Qiang Zhu, Qiao Meng, Xia Jin, Zhihao Liang, Fengchao Tian, Hezhong Li, Tiantian Wang, Tijian Cao, Junji Fu, Qingyan Dey, Sagnik Li, Shenshen Huang, Kan Kan, Haidong Shi, Xiaoming Liu, Yang Gangarosa Department of Environmental Health Rollins School of Public Health Emory University AtlantaGA30322 United States Department of Environmental and Occupational Health Sciences School of Public Health University of Texas Health Science Center at Houston HoustonTX77030 United States Department of Behavioral Science and Health Equity College for Public Health and Social Justice Saint Louis University St. LouisMO63104 United States School of Public Health Fudan University Shanghai200032 China School of Public Health and Emergency Management Southern University of Science and Technology Shenzhen518055 China State Key Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing100875 China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental Health Chinese Center for Disease Control and Prevention Beijing100021 China School of Atmospheric Sciences Nanjing University Nanjing210023 China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing100101 China State Ecologic Environmental Scientific Observation and Research Station at Dianshan Lake Shanghai Environmental Monitoring Center Shanghai200235 China Centre for Atmospheric Sciences Indian Institute of Technology Delhi Hauz Khas New Delhi110016 India State Key Laboratory of Remote Sensing Science Aerospace Information Research Institute Chinese Academy of Sciences Beijing100101 China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Fudan University Shanghai200433 China

Ambient PM2.5 pollution poses a major risk to public health in China, contributing to significant mortality and morbidity. While overall PM2.5 concentrations have declined in recent years, the changes in PM2.5 chemical constituents remain inadequately understood due to limited ground monitoring networks. We developed a Super Learner model that integrates MISR satellite data, chemistry transport model simulations, and land use information to predict daily OC concentrations across China from 2003 to 2019 at a 10-km spatial resolution. The model achieved high predictive accuracy with a cross-validation R2 of 0.84 and an RMSE of 4.9 μg/m3. Our findings show elevated OC levels in Northern China, driven by industrial activities with concentrations exceeding 30 μg/m3 during the heating season. In contrast, forest fires were the primary contributors in Yunnan, raising OC concentrations to 20–30 μg/m3 during fire seasons. Over the 17-year period, the national OC trend declined by 1.3 % annually. Regionally, the Beijing-Tianjin-Hebei region and the Fenwei Plain experienced faster reductions at annual rates of 1.5 % and 2.0 %, respectively, while Yunnan exhibited no significant trends. To better understand pollution source contributions, we analyzed the OC/EC ratio, which indicated higher ratios in less populated rural areas, suggesting agricultural and biogenic emissions, while lower ratios in urban clusters pointed to primary sources such as traffic and industrial activities. Notably, since 2013, significant decreases in the OC/EC ratio have been observed in the North China Plain, likely reflecting the impact of stringent air pollution control policies on biomass burning. This study provides valuable exposure estimates for epidemiological research on the long-term health effects of OC in China, offering insights for evaluating air quality policies and guiding future management strategies. © 2024

关键词： Air quality

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Interannual and Decadal Changes in Tropospheric Ozone in China and the Associated Chemistry–Climate Interactions: A Review

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Advances in Atmospheric Sciences 2019年第9期36卷 975-993页

作者： Yu FU Hong LIAO Yang YANG Climate Change Research Center Chinese Academy of SciencesBeijing 100029China Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China

China has been experiencing widespread air pollution due to rapid industrialization and urbanization in recent *** two major concerns of ambient air quality in China are particulate matter(PM)and tropospheric ozone(O3).With the implementation of air pollution prevention and control actions in the last five years,the PM pollution in China has been substantially *** contrast,under the conditions of the urban air pollution complex,the elevated O3 levels in city clusters of eastern China,especially in warm seasons,have drawn increasing *** of air pollutants and their precursors not only contribute to regional air quality,but also alter *** change in turn can change chemical processes,long-range transport,and local meteorology that influence air *** to PM,less is known about O3 pollution and its climate effects over ***,we present a review of the main findings from the literature over the period 2011-18 with regard to the characteristics of O3 concentrations in China and the mechanisms that drive its interannual to decadal variations,aiming to identify robust conclusions that may guide decision-making for emissions control and to highlight critical knowledge *** also review regional and global modeling studies that have investigated the impacts of tropospheric O3 on climate,as well as the projections of future tropospheric O3 owing to climate and/or emission changes.

关键词： tropospheric ozone chemistry-climate interactions interannual and decadal variations China

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Influences of Synoptic Circulations on Regional transport, Accumulation And Chemical Transformation for Pm2.5 Heavy pollution Over Twain-Hu Basin, Central China

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SSRN 2023年

作者： Yao, Jingyan Bai, Yongqing Zhao, Tianliang Zhu, Yan Sun, Xiaoyun Tan, Chenghao Xiong, Jie Luo, Yuehan Hu, Weiyang Yang, Tong Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster Nanjing University of Information Science and Technology Nanjing210044 China Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research Institute of Heavy Rain China Meteorological Administration Wuhan430205 China Hubei Meteorological Service Center Wuhan430205 China Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing Anhui Institute of Meteorological Sciences Hefei230031 China State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University 163 Xianlin Rd Jiangsu Nanjing210023 China

The Twain-Hu Basin (THB), located in Central China, serves as a key juncture where the northerly "polluted" airflows of the East Asian winter monsoon meet the southerly warm and humid airflows. Using the T-PCA objective synoptic pattern classification, FLEXPART-WRF, and Random Forest model, we investigate the influences of synoptic circulations on regional transport, local accumulation, and chemical transformation of PM2.5 during heavy air pollution over the THB in January of 2015-2022. The results show that the transport-type synoptic pattern accounts for 65.16% of heavy PM2.5 pollution, indicating that regional transport of PM2.5 dominates the THB’s heavy air pollution. The PM2.5/CO ratio is higher in the transport-type pattern and positively correlated with PM2.5 concentrations, reflecting a higher efficiency of chemical transformation to secondary PM2.5 in transport-type pollution compared with the accumulation-type pollution. transport-type heavy PM2.5 pollution is predominantly influenced by upstream anomalous northerly and easterly airflows at the bottom of the high-pressure system, converging with the southern wind in the receptor area over the THB. Accumulation-type heavy pollution exhibits weak wind anomalies in central and eastern China under the control of a uniform pressure field. Furthermore, thermally-induced vertical circulations with sinking airflows in the middle and lower troposphere suppress the vertical air pollutant dispersions. The relative contributions of atmospheric factors for transport-type PM2.5 heavy pollution events are 38.0% for dynamical driver, 26.8% for thermal driver, and 35.1% for chemical transformation, while in accumulation-type, the contribution rates are 33.9%, 36.3%, and 29.7%, respectively. This study elucidates the influences of synoptic patterns on regional transport, local accumulation, and chemical transformation of PM2.5 for heavy air pollution, with implications for understanding changes of air quality in the recepto

关键词： Atmospheric movements

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Sonicated Zeolitic Imidazolate Frameork-8 derived Nitrogen-doped hierarchical nanoporous carbon for efficient capture and reversible storage of radioiodine

Research Square

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Research Square 2021年

作者： Miensah, Elvis Djam Chen, Jiuyu Gu, Aotian Wang, Peng Liu, Ying Gong, Chunhui Mao, Ping Chen, Kai Jiao, Yan Zhang, Zongxiang Yang, Yi Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province School of Chemical Engineering Huaiyin Institute of Technology Huaian223003 China Nanjing University of Information Science & Technology Nanjing210044 China Jiangsu Environmental Protection Key Laboratory of Monitoring for Organic Pollutants in Soil Taizhou Environmental Monitoring Center Taizhou225300 China

Iodine plays a significant role in industry and in chemical processes within living organisms. However, radioiodine exposure possess threats such as thyroid cancer to humans, when they are released into the environment when using nuclear technology and through nuclear accidents. Its capture and storage is critical to safeguard industrial applications while preventing environmental leakages. Herein we report efficient radioiodine capture using a hierarchical nitrogen-doped, large surface area, nanoporous carbon derived from ultrasonication of ZIF-8. The carbon exhibited high adsorption capacity of 434 wt% gravimetrically and 1418 mgg-1 in cyclohexane solution with fast kinetics and high recoverability. We deduced the high adsorption capacity to be due to the large surface area with micro and mesopores, presence of hydroxyl groups acting as electron donors and the presence of nitrogen, which interacts strongly with the electron‐deficient iodine (I2). Moreover, the process best fits the pseudo-second-order and Freundlich models with multilinearity observed with Webber-Morris model. Because of its comparatively lower cost, large surface area, facile preparation, good regeneration and fast kinetics, the as-prepared porous carbon shows exceptional promise as radioiodine adsorbent. © 2021, CC BY.

关键词： Adsorption

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Influence of Typical Clay Minerals on Aggregation and Settling of Pristine and Aged Polyethylene Microplastics

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SSRN 2022年

作者： Wang, Yi Chen, Xingwei Wang, Feifeng Cheng, Niansheng Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Fujian Normal University Fuzhou350007 China School of Geographical Sciences Fujian Normal University Fuzhou350007 China State Key Laboratory for Subtropical Mountain Ecology Ministry of Science and Technology Fujian Normal University Fujian Province Fuzhou350007 China Fujian Province Key Laboratory of Pollution Control and Resource Recycling Fujian Normal University Fuzhou350007 China Ocean College Zhejiang University Zhoushan316021 China

Microplastics (MPs) are emerging as a class of pollutants that are a potential threat to biological and human health. The aging process can alter the physicochemical properties of MPs, which is critical to their fate and transport in the aquatic environment. This study investigated the effect of typical clay minerals on the aggregation and settling behavior of pristine and aged polyethylene microplastics (PEs) in different electrolyte solutions. The results showed that clay minerals enhance the stability of PEs by increasing electrostatic repulsion during heteroaggregation, and electrostatic interactions dominate the process of heteroaggregation. Moreover, the Hamaker constant decreases after ageing of PEs and the increased surface negative charge inhibits homoaggregation in NaCl solutions. In contrast, the specific reaction of divalent cations with the O-containing groups on the surface of aged PEs weakens the electrostatic repulsion. The aggregation mechanism is consistent with the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Interestingly, typical clay minerals cause PEs, which are always suspended or floating in the upper layers of the water column, to settle through a heteroaggregation process in NaCl solutions. These results provide new insights into the environmental fate and distribution of MPs in natural waters. © 2022, The Authors. All rights reserved.

关键词： Agglomeration

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