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Effects of Counterion Type on Standard Anion Exchange Resin-Based Selective Arsenic Removal Process for Polluted Groundwater

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SSRN 2022年

作者： Li, Shida Yang, Xiaoying Zheng, Shaokui Duan, Shoupeng Zheng, Xiangnan Wang, Zhixuan School of Environment MOE Key Laboratory of Water and Sediment Sciences State Key Lab of Water Environment Simulation Beijing Normal University Beijing100875 China Environmental Simulation and Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment No. 18 Ruihe Road Guangzhou510530 China

This study demonstrated the remarkable effect of counterion type (i.e., chloride or bicarbonate) on selective arsenic (As) removal from polluted groundwater by the combination of a standard anion exchange resin (standard AER) column and spent brine electrocoagulation (or chemical coagulation) during long-term cyclic operation. Either chloride or bicarbonate counterion resulted in successful preference for trace arsenate over sulfate during the exhaustion of a standard AER column after its circular activation/regeneration by optimized binary brines;this process yielded quality product water during 18 exhaustion–regeneration cycles without brine replacement or purification. Furthermore, they both ensured selective As removal from As-rich spent brine by iron (Fe)- or aluminum (Al)-based chemical coagulation, and chloride counterion ensured selective As removal from As-rich spent brine by Fe- or Al-based electrocoagulation. However, high bicarbonate concentration in spent brine resulted in no significant Fe- or Al-based electrocoagulation reaction because of passivation film formation on the anode surface. Based on the differences in metal dosage, sludge production, and residual metal concentration, Fe-based electrocoagulation and chloride-based binary brine are recommended during the standard AER-based selective As removal process for polluted groundwater. Finally, the operational data over 114 exhaustion–regeneration cycles supported the stability and high As-selectivity of the combined process, thus providing a good solution for the disposal of spent brine that is frequently generated during the ion exchange process. © 2022, The Authors. All rights reserved.

关键词： Ion exchange

Simultaneously Complete Removal of Nitrate, Nitrobenzene and Aniline from Groundwater in a Vertical Baffled Biofilm Reactor

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SSRN 2022年

作者： Cao, Lifeng Xu, Wenxin Ge, Runlei Zhang, Yongming Li, Guanghe Zhang, Fang State Key Joint Laboratory of Environment Simulation and Pollution Control State Environment Protection Key Laboratory of Microorganism Application and Risk Control School of Environment Tsinghua University Beijing100084 China Beijing100015 China Department of Environmental Science and Engineering School of Environmental and Geographical Science Shanghai Normal University Shanghai200234 China

The challenge of simultaneous removal of nitrobenzene (NB), aniline (AN) and nitrate from groundwater in a single bioreactor is mainly attributed to the persistence of AN to degradation with anoxic denitrification conditions. In this work, simultaneous removal of NB (100 μM), AN (100 μM) and nitrate (1 mM) was achieved within 8 h with a COD/N ratio of 8 in a vertical baffled biofilm reactor (VBBR). By setting DO concentration at 0.4-0.5 mg L −1 to create a micro-aerobic condition, NB removal rate was accelerated without accumulation of AN, and AN could serve as electron donors for denitrification only in the presence of O 2 . High-throughput sequencing showed that biofilm was predominated by denitrifiers ( Luteimonas , Planctomyces , Thiobacillus , Thauera and so on) and NB-degrading bacteria ( Pseudomonas ), and biodiversity varied vertically along the height of the reactor. A dominantly anaerobic pathway for reducing NB to AN was identified by PICRUSt analysis, as the predicted genes involved in aerobic transformation of NB were several magnitudes lower than those in the anaerobic pathway. This study provided a new insight to the role of oxygen in robust bioremediation groundwater contaminated with NB, AN and nitrate. © 2022, The Authors. All rights reserved.

关键词： Bioremediation

Comparison of Three Source Apportionment Methods Based on Observed and Initial Hcho in Taiyuan, China

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SSRN 2023年

作者： Cui, Yang Hua, Jingya He, Qiusheng Guo, Lili Wang, Yonghong Wang, Xinming School of Environment and Resources Taiyuan University of Science and Technology Taiyuan030024 China Taiyuan University of Science and Technology China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China Guangzhou510640 China

Identifying the sources of formaldehyde (HCHO) is the key to reducing the pollution of HCHO and ozone (O3) on the ground level. Using the same data sets applied to the positive matrix factorization (PMF) model by (Hua et al. 2023), the initial concentrations of the HCHO were estimated using the photochemical age and the sources of observed and initial HCHO were apportioned based on multiple linear regression (MLR) and photochemical age-based parameterization (PCAP) method. The results suggested that the source of initial HCHO could better reflect its contribution. The secondary formation contributed to 49.3-69.1% of initial HCHO at four sites in Taiyuan based on MLR, which were higher (7.4-36.2%) than the contributions of secondary formation from observed HCHO. The HCHO was mainly affected by anthropogenic secondary (10.8-34.4%) and background sources (17.4-78.7%) based on PCAP method. We compared the results of HCHO sources from MLR, PCAP and PMF models under the condition of photochemical loss. There was good agreement among the emission ratio of HCHO based on acetylene obtained by different methods at four sites. The correlation analysis of different source apportionment methods illustrated that primary emissions from the PCAP and the MLR model had greatest correlation (0.22-0.60). The secondary formation from PMF model and the MLR model showed good correlations at all four sites, with R values ranging from 0.42 to 0.83. The HCHO peak of diurnal variation simulated by the MLR appeared late compared with other methods, and the difference of daily variation of HCHO from the PMF model was significantly higher than that of PCAP and MLR. The overlapping conclusions of different source apportionment method should be seriously considered and used to guide efforts in improving air quality. © 2023, The Authors. All rights reserved.

关键词： Multiple linear regression

Facile Synthesis of Direct Z-Scheme Uio-66-Nh2/Phc2cu Heterojunction with Ultrahigh Redox Potential for Enhanced Photocatalytic Cr(Vi) Reduction and Nor Degradation

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SSRN 2022年

作者： Lin, Zili Wu, Yuliang Jin, Xiaoyu Liang, Danluo Jin, Yuhan Huang, Shoubin Wang, Zhongquan Liu, Haijin Chen, Ping Lv, Wenying Liu, Guoguang School of Environmental Science and Engineering Guangdong University of Technology Guangzhou510006 China Shenzhen Key Laboratory of Organic Pollution Prevention and Control Environmental Science and Engineering Research Center Harbin Institute of Technology Guangdong Shenzhen518055 China Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control School of Environment Henan Normal University Xinxiang453007 China

Z-scheme heterojunction-based photocatalysts typically have robust removal efficiencies for water contaminants. Herein, we employed p-type PhC 2 Cu and n-type UiO-66-NH 2 to develop a direct Z-scheme UiO-66-NH 2 /PhC 2 Cu photocatalyst with an ultrahigh redox potential for Cr(VI) photoreduction and norfloxacin (NOR) photodegradation. Moreover, UV-vis diffuse reflectance, photoelectrochemical measurements, photoluminescence (PL) spectra and electron spin resonance (ESR) technique revealed that the UiO-66-NH 2 /PhC 2 Cu composite boosted light capturing capacities to promote photocatalytic efficiencies. Strikingly, the optimized UiO-66-NH 2 /PhC 2 Cu50 wt% rapidly reduced Cr(VI) (96.2%, 15 min) and degraded NOR (97.9%, 60 min) under low-power blue LED light. Benefitting from the enhanced interfacial electron transfer and ultrahigh redox potential of the Z-scheme heterojunction, the UiO-66-NH 2 /PhC 2 Cu photocatalyst greatly enhanced the separation efficacies of photogenerated carriers. This resulting abundance of active species (e.g., e - , h + , O 2 •- , and •OH) were generated to photo-reduce Cr(VI) and photo-oxidize NOR. Finally, the Z-scheme mechanism were systematically confirmed through X-ray photoelectron spectroscopy (XPS), ESR, cyclic voltammetry (CV) tests, and photodeposition techniques. © 2022, The Authors. All rights reserved.

关键词： Heterojunctions

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

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Science Bulletin 2025年第11期70卷 1846-1855页

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

Integration of Physical Solution and Ionic Liquid Toward Efficient Phase Splitting for Energy-Saving Co2 Capture

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SSRN 2023年

作者： Li, Jinyang Zhao, Yuzheng Zhan, Guoxiong Xing, Lei Huang, Zhoulan Chen, Zhen Deng, Yanxi Li, Junhua Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources School of Materials Science and Technology China University of Geosciences Beijing100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Carbon dioxide (CO2) capture from flue gas is crucial for achieving industrial carbon neutrality. Using a biphasic solvent can significantly reduce the volume of regenerated solvent for energy-saving carbon capture. In this study, a novel strategy for biphasic solvent preparation is proposed by combining amine blends (3,3'-Diaminodipropylamine (DADPA)/N-Methyldiethanolamine (MDEA)) and composite agents (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BN) and sulfolane (TMS)) to achieve rapid phase splitting. The screened proportion of DADPA:MDEA:TMS:BN:H2O was 2:6:2:1:2 (labelled DMTB). Experimental evaluation revealed that the DMTB solvent exhibits a high CO2 capacity of 4.59 mol/L and a low viscosity of approximately 50vol% in the rich phase (109 mPa*S). In particular, complete phase separation was achieved within 3 min, with a phase splitting efficiency and carbon enrichment rate of approximately 100%, which is superior to that of the current biphasic solvents. The 13C nuclear magnetic resonance results indicated the formation of DADPACOO- in the CO2-saturated phase in the presence of water rather than bicarbonate while observing dissociative behaviour in MDEA and TMS. Therefore, the phase separation analysis revealed that the products of protonated amines and carbamic acid species were highly polar and preferred to dissolve in the water phase. The physical solvents TMS and BN facilitated the extraction of water and were distributed in the organic phase. This study provides an optional biphasic solvent with phase splitting ability for CO2 capture from flue gas. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

Separated Active Site and Reaction Space for Multi-Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

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Advanced Functional Materials 2023年第48期33卷

作者： Wei, Lu Liu, Yuxi Cui, Suping Wang, Can Hsi, Hsing-Cheng Duan, Erhong Peng, Yue Dai, Hongxing Guo, Guangsheng Deng, Jiguang Key Laboratory of Beijing on Regional Air Pollution Control Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological Effects Beijing University of Technology Beijing100124 China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of Technology Beijing100124 China School of Environmental Science and Engineering Tianjin University Tianjin300350 China Graduate Institute of Environmental Engineering National Taiwan University Taipei10617 Taiwan School of Environmental Science and Engineering Hebei University of Science and Technology Hebei050018 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

It is possible to remove volatile organic compounds containing chlorine (CVOCs, such as chlorobenzene) in a single device designed for selective catalytic reduction of NOx with NH3 for the industries containing CVOCs and NOx. Breaking the efficiency-selectivity trade-off in chlorobenzene oxidation remains a major challenge due to the conjugation of halogen atoms with the benzene ring and the reducing nature of NH3. A stepwise synthesis strategy is demontrated to disperse dual Ru/Cu Lewis acid sites outside and inside the zeolite channel. Under the confinement of zeolite, the Ru4+ Lewis acid site on the external surface of the zeolite promotes chlorobenzene oxidation by weakening the p-π conjugate structure of Cl and benzene ring, while the Cu2+ Lewis acid site within the internal channel converts NOx and NH3 to N2. The mutual interference between catalytic oxidation and reduction is successfully avoided. Therefore, the low toxic CO2 and HCl selectivity experience a considerable increase from 21% to 86%, and from 51% to 94% with 91% conversion of chlorobenzene, while maintaining excellent elimination performance for NO (with N2 selectivity exceeding 90%). The incorporation of separated active sites and reaction spaces into the design may offer potentials for other energy and environmental applications. © 2023 Wiley-VCH GmbH.

关键词： Zeolites

Research on the Potential of Urban Green-Blue Infrastructure in Carbon Reduction Benefits

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景观设计学(中英文) 2025年第2期13卷 12-25页

作者： Yunsheng BAI Gengyuan LIU Mingwan WU Zhaoman HUO Ningyu YAN Fanxin MENG Qing YANG Zhongming LU Silvio CRISTIANO State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing100875China Beijing Engineering Research Center for Watershed Environmental Restoration and Integrated Ecological Regulation Beijing 100875China Guangdong Basic Research Center of Excellence for Ecological Security and Green Development Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of EducationSchool of EcologyEnvironment and ResourcesGuangdong University of TechnologyGuangzhou 510006China Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China Division of Environment and Sustainability Hong Kong University of Science and TechnologyHong Kong 999077China Department of Architecture University of FlorenceFlorence 50121Italy

Urban green-blue infrastructures(GBls)are increasingly gaining attention in the pursuit of carbon neutrality,particularly within residential *** this background,this study established an integrated quantitative framework to assess both direct and indirect carbon reduction benefits of urban GBls,by leveraging Life Cycle Assessment approach to precisely calibrate the carbon sequestration benefits of three typical urban GBls(green roofs,sunken green spaces,and rain gardens)under three different scenarios and building a carbon sequestration database that includes 36 local plant species in *** research results indicate that GBls have a reducing effect on carbon emissions in urban residential *** extrapolating the simulation results to the city scale,the preliminary estimation suggests that the construction of GBls within residential areas in Shanghai can achieve a carbon sink of approximately 540.54 million tCOzeq per *** level of carbon sequestration is equivalent to 32%of Shanghai's annual carbon *** is evident that the construction of GBls possesses significant potential in carbon reduction benefits and for achieving urban carbon neutrality strategies.

关键词： Green-Blue Infrastructure Life Cycle Assessment Planting Design Green-Blue Infrastructure Design Carbon Reduction Benefit Carbon Sequestration Residential Area

Influence of pore size and membrane surface properties on arsenic removal by nanofiltration membranes

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Frontiers of environmental Science & Engineering 2019年第2期13卷 55-62页

作者： Nathalie Tanne Rui Xu Mingyue Zhou Pan Zhang Xiaomao Wang Xianghua Wen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Nanofiltration(NF)has a great potential in removing arsenate from contaminated *** performance including arsenate rejection,water permeability and resistance to fouling could however differ substantially among NF *** study was conducted to investigate the influence of membrane pore size and surface properties on these aspects of membrane *** fullyaromatic NF membranes with different physicochemical properties were adopted for this *** results showed that surface charge,hydrophobicity,roughness and pore size could affect water permeability and/or arsenate rejection considerably.A more negative surface charge was desirable to enhance arsenate rejection ***90 and a non-commercialized membrane(M#1)demonstrated the best performance in terms of arsenate rejection and water *** M#1 membrane showed less membrane fouling than NF90 when used for filtration of real arsenic-containing *** was mainly due to its distinct chemical composition and surface properties.A severe membrane fouling could lead to a substantial reduction of arsenic *** M#1 membrane showed the best performance,which indicated that membrane modification could indeed enhance the overall membrane performance for water treatment.

关键词： Arsenate Nanofiltration Drinking water Membrane property Membrane fouling