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Catalytic performance of Pd catalyst supported on CeO_(2) or ZrO_(2) modified beta zeolite for methane oxidation

Journal of environmental Sciences 2025年第6期152卷 248-261页

作者： Yingao Zhang Zidi Yan Min Xiao Chunlei Zhang Luna Ruan Yanshuang Zhang Yun Zhong Yong Yan Yunbo Yu Hong He School of Rare Earths University of Science and Technology of ChinaHefei 230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Two kinds of oxide-zeolite composite support,Ce-beta and Zr-beta were prepared by a simple wet impregnation method and adopted for the preparation of palladium-based catalysts for catalytic oxidation of *** Pd/6.8Zr-beta catalyst showed superiormethane oxidation performance,achieving T_(50) and T90 of 41.℃ and 451.,respectively,together with robust hydrothermal *** analysis has shown that incorporating Zr into the catalyst significantly enhanced its efficiency,nearly tripling the turnover frequency(TOF)for methane combustion compared to the Pd/beta *** enhanced performance was attributed to the dispersion of Zr on the zeolite surface,which not only promoted the formation of active PdO sites but also helped maintain the high Pd^(2+)content via facilitating the oxygen migration during the reaction,thus improving both the catalyst’s activity and *** the Pd/8.6Ce-beta catalyst,doped CeO_(2) tended to aggregate in the zeolite’s pores,adversely affecting the catalyst’s *** aggregation promoted the formation of inactive Pd^(4+) species,a result of the enhanced metal-support *** finding is critical for understanding the implications of dopant selection in the design of high-activity methane oxidation catalysts.

关键词： Methane combustion Palladium catalyst Oxide-zeolite Metal-support interaction Cerium doping Zirconium doping

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Effects of persulfate-assisted hydrothermal treatment of municipal sludge on aqueous phase characteristics and phytotoxicity

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Journal of environmental Sciences 2023年第4期126卷 163-173页

作者： Guangchun Shan Weiguang Li Yujie Zhou Shanshan Bao Lin Zhu Wenbing Tan State Key Laboratory of Environmental Criteria and Risk Assessment and State Environmental Protection Key Laboratory of Simulation and Control of Groundwater PollutionChinese Research Academy of Environmental SciencesBeijing 100012China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Key Laboratory of Water Management and Water Security for Yellow River Basin of Ministry of Water Resources(Under Construction) Yellow River Engineering Consulting Co.LtdZhengzhou 450003China

Hydrothermal technology (HT) has received much attention in recent years as a process to convert wet organic waste into *** aqueous phase (HTAP) produced by this process is still a burden and has become a bottleneck issue for HT process *** this study,we provide the?rst investigation of the HTAP characteristics,phytotoxicity,and their correlation with persulfate (PS)(PS,2.0 mmol/g TS)-assisted municipal sludge *** results showed that PS accelerated the hydrolysis of protein substances and increased the concentration of NH_(4)^(+)by 1..4%to 1.0.5%and that of PO_(4)^(3-)by 24.2%to 1.03.7%in HTAP at hydrothermal temperatures of 1.0 to 240℃.PS can reduce the phytotoxicity of HTAP by reducing aldehydes,ketones,N heterocyclic compounds,and particle size and by increasing its humi?cation *** maximum values of the root length and biomass of pakchoi(Brassica chinensis L.) seedlings occurred when electrical conductivity was 0.2 mS/cm of *** work provided a new strategy for the selection and design of HTAP management strategies.

关键词： Hydrothermal technology Aqueous phase characteristics Pakchoi Seedlings Phytotoxicity

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Advances in the treatment of multi-pollutant flue gas in China's building materials industry

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Journal of environmental Sciences 2023年第1期123卷 400-416页

作者： Shangchao Xiong Jianjun Chen Hao Liu Wenzhe Si Yue Peng Xuecheng Wu Huan Liu Junhua Li State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Clean Energy Utilization School of Energy EngineeringZhejiang UniversityHangzhou 310027China

In most of the world’s building material industries,the control of flue gas pollutants mainly focuses on a single ***,given the large capacity and high contribution of China’s building materials industry to global air {1.,the need to develop multipollutant emission reduction technology is ***,China has focused on reducing the emissions of flue gas pollutants in the building materials industry,established many key research and development projects,and gradually implemented more stringent pollutant emission *** project focuses on the most recent advances in flue gas emission control technology in China’s building materials industry,including denitration,dust removal,desulfurization,synergistic multi-pollutant emission reduction,and the construction of pilot research and demonstration projects for pollutant removal in several building material *** this basis,revised pollutant limits in flue gas emitted in China’s building material industry are proposed.

关键词： Building materials industry Multi pollutants Emission control Flue gas Demonstration project

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Drivers of microbial beta-diversity in wastewater treatment plants in China

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Journal of environmental Sciences 2022年第5期34卷 341-349页

作者： Bing Zhang Ting Yang Chenxiang Sun Xianghua Wen College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China Environmental Simulation and Pollution Control State Key Joint Laboratory School of EnvironmentTsinghua UniversityBeijing 100084China

As one of the most well-documented biogeographic patterns,the distance-decay relation-ship provides insights into the underlying mechanisms driving biodiversity ***-though wastewater treatment plants(WWTPs)are well-controlled engineered ecosystems,this pattern has been seen among microbial communities in activated sludge(AS).However,little is known about the relative importance of {1. heterogeneity and dispersal limitation in shaping AS microbial community across China;especially they are related to spatial scale and organism ***,we assessed the distance-decay relationship based on different spatial scales and microbial phylogenetic groups by analyzing 1.2 activated sludge(AS)samples across China comprising 3,379,2001.S rRNA *** results in-dicated that the drivers of distance-decay pattern in China were *** biogeographic patterns in WWTPs were mainly driven by dispersal limitation at both local and national *** contrast,conductivity,SRT,and pH played dominant roles in shaping AS microbial community compositions at the regional *** rates and the drivers of beta-diversity also varied with microorganism ***,a quantitative re-lationship between dispersal limitation ratio and AS microbial turnover rate was ***,these results highlighted the importance of considering multiple spatial scales and micro-organism types for understanding microbial biogeography in WWTPs and pro-vided new insights into predicting variations in AS community structure in response to {1. disturbance.

关键词： Wastewater treatment plant Distance-decay pattern Scale-dependent Microbial assembly Dispersal limitation

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Nonpolar cross-stacked super-aligned carbon nanotube membrane for efficient wastewater treatment

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Frontiers of environmental Science & Engineering 2023年第3期17卷 37-47页

作者： Shuang Zhang Shuai Liang Yifan Gao Yang Wu Xia Huang Bejing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Engineering Research Center for Water Pollution Source Control&Eco-remediation College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China

Membrane separation technology has made great progress in various practical applications,but the unsatisfactory separation performance of prevailing membrane materials hampers its further sustainable *** study proposed a novel nonpolar super-aligned carbon nanotube(SACNT)membrane,which was prepared with a layer-by-layer cross-stacking *** controlling the number of stacked SACNT layers,three kinds of SACNT membranes(SACNT_200,SACNT 300,and SACNT_400)were *** characterizations and filtration tests were performed to investigate their physico-chemical properties,surface wetting behavior,and filtration *** with two commercial membranes(Com_0.22 and Com_0.45),all the SACNT membranes achieved smoother and more uniform *** to the hexagonal graphene structure of CNTs,the surface chemistry of the SACNT membranes is simple and inert,thereby potentially eliminating the covalent-bonding-induced membrane ***,the SACNT membranes exhibited a typical nonpolar wetting behavior,with high contact angles for polar liquids(water:~1.4.9°-1.6.5°;formamide:~80.0°-83.99)but low contact angles for nonpolar diodomethane(~1..8°-20.99).This unique nonpolar feature potentially leads to weak interactions with polar ***,compared with the commercial membranes,the SACNT membranes obtained a significantly higher selectivity while achieving a comparable or higher permeability(depending on the number of stacked layers).Moreover,the SACNT membranes exhibited superior separation performance in various application scenarios,including municipal wastewater treatment(2.3 times higher cleaning efficiency),electro-assistant fouling inhibition(or even self-cleaning),and oil/water separation(>99.2%of separation efficiency),suggesting promising application prospects in various fields.

关键词： Membranefouling Wastewater Membrane separation Antifouling Aligned carbon nanotube

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Rapid reduction of air pollution and short-term exposure risks in China

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Journal of environmental Sciences 2025年第3期149卷 126-138页

作者： Hao Fan Chuanfeng Zhao Yikun Yang Xingchuan Yang State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentBeijing Normal UniversityBeijing 100875China Laboratory for Climate and Ocean-Atmospheric Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China College of Resource Environment and Tourism Capital Normal UniversityBeijing 100048China

With the continuous control of anthropogenic emissions,China’s air quality has improved significantly in recent *** this background,research on how the short-term exposure risks caused by air {1. in China have changed is *** study utilized hourly concentration data from ground observation stations and the official air quality guidelines of the Ministry of Ecology and Environment of China and the World Health Organization as standards to systematically investigate the spatiotemporal characteristics and short-term exposure risks of air {1. in China from 201. to *** results indicate that various atmospheric pollutants except for ozone showed a decreasing trend ***,both single pollutant air {1. days(SAPDs)and multiple pollutant air {1. days(MAPDs)showed varying degrees of reduction within 1. and 25 days,*** was dominated mainly by excessive PM_(2.5)and PM_(1.)pollutants,while MAPD was dominated mainly by excessive pollutant combinations,including PM_(2.5)+PM_(1.),CO+PM_(2.5)+PM_(1.),and SO_(2)+PM_(2.5)+PM_(1.).As the concentration of atmospheric pollutants decreased,the total excess risk(ER)decreased yearly from 201. to 2022,but there were significant regional ***,the ER is less than 0.25%in southern China,in the range of 0.25%-0.5%in the North China Plain and some cities in the northeast,and higher than 1.in the *** matter is currently the primary pollutant posing short-term exposure risk in China,especially due to the impact of sandstorm *** study indicates that China’s atmospheric cleaning action is significantly beneficial for reducing health risks.

关键词： Air pollution Emission-reduction Total excess risk Particulate matter China

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Low-condensation diesel use contributes to winter haze in cold regions of China

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environmental Science and Ecotechnology 2024年第6期22卷 226-232页

作者： Weiwei Song Mengying Wang Yixuan Zhao Yu Bo Wanying Yao Ruihan Chen Xianshi Wang Xiaoyan Wang Chunhui Li Kebin He State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing100029China Harbin Ecological and Environmental Monitoring Center Harbin150076China Collaborative Innovation Center for Regional Environmental Quality Beijing100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084China

The application of low-condensation diesel in cold regions with extremely low ambient temperatures(−1. to−29℃)has enabled the operation of diesel ***,it may contribute to heavy haze pollution in cold regions during *** we examine pollutant emissions from low-condensation diesel in *** measure the emissions of elemental carbon(EC),organic carbon(OC),and elements,including heavy metals such as arsenic(As).Our results show that low-condensation diesel increased EC and OC emissions by 2.5 and 2.6 times compared to normal diesel fuel,*** of vehicular sources,including EC,As,lead(Pb),cadmium(Cd),chromium(Cr),nickel(Ni),and manganese(Mn),increased by approximately 20.2-1.2.5%when using low-condensation *** variation of vehicular source indicators,observed at road site ambient environments revealed the enhancement of PM2.5 pollution by the application of low-condensation diesel in *** findings suggest that−35#diesel,a low-cetane index diesel,may enhance air pollution in winter,according to a dynamometer test conducted in *** raises questions about whether higher emissions are released if−35#diesel is applied to running vehicles in real-world cold ambient environments.

关键词： Low condensation diesel Carbonaceous matterHeavy metal Dynamometer Cold regions

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Adsorptive interaction between typical VOCs and various topological zeolites:Mixture effect and mechanism

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Journal of environmental Sciences 2024年第2期136卷 626-636页

作者： Bo Yu Hua Deng Yuqin Lu Tingting Pan Wenpo Shan Hong He Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Adsorption is one of the most feasible and effective methods to alleviate the volatile organic compounds(VOCs)***,the mixture effect and mechanism for competitive adsorption of VOCs on zeolites are barely *** this study,toluene,acetone,and ethyl acetate as prevalent VOCs species were removed by four potential zeolites(1.X,USY,Beta,ZSM-5)in both single-and multi-component *** structure-property relationship between adsorbate-adsorbent pairs was revealed by X-ray diffraction,scanning electron microscopy,energy dispersive spectrometer,X-ray fluorescence,N_(2) adsorption and density function theory *** molecular polarity and volatility of VOCs species played key roles in adsorption and the dynamic uptakes were generally listed as follows:ethyl acetate>toluene>*** for the above VOCs mixtures,1.X zeolite selectively adsorbed oxygenated VOCs rather than *** contrast,USY exhibited a preference to trap *** acetate could be readily enriched by ZSM-5 and Beta *** possible explanations and implications are discussed based on the subtle change in electron *** results obtained are vital for understanding the mixture effect of VOCs adsorption and may guide the selection of proper adsorbent for real applications.

关键词： Adsorption Zeolites VOCs Mixture effect DFT

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Spatial heterogeneity and compositional profiles of dissolved organic matter in farmland soils across China' Mainland

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Journal of environmental Sciences 2024年第3期137卷 593-603页

作者： Bingjun Han Liyuan Chen Kang Xiao Yang Liu Dong Cao Lu Yu Yujun Li Shu Tao Wenxin Liu Key Laboratory for Earth Surface Processes College of Urban and Environmental SciencesPeking UniversityBeijing 100871China Beijing Yanshan Earth Critical Zone National Research Station College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 101408China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental ScienceChinese Academy of SciencesBeijing 100085China

Dissolved organic matter(DOM) plays an essential role in many geochemical processes,however its complexity, chemical diversity, and molecular composition are poorly understood. Soil samples were collected from 500 vegetable fields in administrative regions of China' Mainland, of which 1.2 were selected for further investigation. DOM properties were characterized by three-dimensional excitation-emission matrix(3D-EEM) fuorescence spectroscopy and Fourier transform ion cyclotron resonance mass spectrometry(FTICRMS)(field intensity is 1. Tesla). Our results indicated that the main constituents were UVA humic-like substances, humic-like substances, fulvic acid-like substances, and tyrosine-like substances. A total of 1.,989 molecular formulae with a mass range of 1.0.04 to 799.59 Da were detected, covering the mass spectrometric information of the soil samples from 27 different regions. CHO and CHON molecules were dominant in DOM, whereas lignin, tannins,and aromatic substances served as the main components. The results of cluster analysis revealed that the soil properties in Jiangxi Province were considerably different from those in other regions. The key backgrounds of the DOM molecular characteristics in the vegetablefield soil samples across China' Mainland were provided at the molecular level, with large abundance and great variability.

关键词： Dissolved organic matter(DOM) Fourier transform ion cyclotron resonance mass(FTICR-MS) Excitation-emission matrix(EEM) Vegetable-field soils China' Mainland

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Exogenous-organic-matter-driven mobilization of groundwater arsenic

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environmental Science and Ecotechnology 2023年第3期15卷 106-120页

作者： Fan Feng Yonghai Jiang Yongfeng Jia Xinying Lian Changjian Shang Meng Zhao State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012China State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution Chinese Research Academy of Environmental SciencesBeijing100012China College of Water Sciences Beijing Normal UniversityBeijing100875China

The potential release capacity of arsenic(As)from sediment was evaluated under a high level of exogenous organic matter(EOM)with both bioreactive and chemically reactive organic matters(OMs).The OMs were characterized by FI,HIX,BIX,and SUVA254 fluorescence indices showing the biological activities were kept at a high level during the experimental *** the genus level,Fe/Mn/As-reducing bacteria(Geobacter,Pseudomonas,Bacillus,and Clostridium)and bacteria(Paenibacillus,Acidovorax,Delftia,and Sphingomonas)that can participate in metabolic transformation using EOM were *** reducing condition occurs which promoted As,Fe,and Mn releases at very high concentrations of ***,As release increased during the first 1.-20 days,followed by a decline contributed by secondary iron *** degree of As release may be limited by the reactivity of Fe(hydro)*** EOM infiltration enhances As and Mn releases in aqueous conditions causing the risk of groundwater pollution,which could occur in specific sites such as landfills,petrochemical sites,and managed aquifer recharge projects.

关键词： Groundwater arsenic Exogenous organic matter Redox condition Secondary pollution risk

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