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The effect of hydrogen reduction of α-MnO_(2) on formaldehyde oxidation: The roles of oxygen vacancies

Chinese Chemical Letters 2023年第3期34卷 171-174页

作者： Liping Zhou Chunying Wang Yaobin Li Xiaofeng Liu Hua Deng Wenpo Shan Hong He College of Resources and Environmental Sciences Fujian Agriculture and Forestry UniversityFuzhou 350002China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant ConversionInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationInstitute of Urban EnvironmentChinese Academy of SciencesNingbo 315800China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

A series of α-MnO_(2) catalysts with various Mn valence states were treated by hydrogen reduction for different periods of time. Their catalytic capacity for formaldehyde(HCHO) oxidation was evaluated. The results indicated that hydrogen reduction dramatically improves the catalytic performance of α-MnO_(2) in HCHO oxidation. The α-MnO_(2) sample reduced by hydrogen for 2 h possessed superior activity and could completely oxidize 150 ppm HCHO to CO_(2) and H_(2)O at 70℃. Multiple characterization results illustrated that hydrogen reduction contributed to the production of more oxygen vacancies. The oxygen vacancies on the catalyst surface enhanced the adsorption, activation and mobility of O_(2) molecules, and thereby enhanced HCHO catalytic oxidation. This study provides novel insight into the design of outstanding MnO_x catalysts for HCHO oxidation at low temperature.

关键词： Hydrogen reduction α-MnO_(2) Formaldehyde oxidation Oxygen vacancies

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Predominant types of regional cold waves in North China and their historical changes

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atmospheric and Oceanic Science Letters 2024年第4期17卷 46-51页

作者： Xinyi Cheng Yiyi Zhang Jiandong Li Xin Hao Center for Climate System Prediction Research/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of EducationNanjing University of Information Science&TechnologyNanjingChina Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina 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&TechnologyNanjingChina

寒潮事件对东亚地区的社会经济,生态系统和人体健康影响巨大.根据1980-2019年间10月至次年3月的每日寒潮记录和K-means聚类,本文识别出了中国两种不同类型的区域性寒潮(T1和T2). T1区域性寒潮主要影响东北地区,T2区域性寒潮则主要影响... 详细信息

寒潮事件对东亚地区的社会经济,生态系统和人体健康影响巨大.根据1980-2019年间10月至次年3月的每日寒潮记录和K-means聚类,本文识别出了中国两种不同类型的区域性寒潮(T1和T2). T1区域性寒潮主要影响东北地区,T2区域性寒潮则主要影响华北和东部地区.与T1区域性寒潮相比, T2区域性寒潮强度更强,持续时间更长,影响范围更广. 1980–2019年期间, T1区域性寒潮的频率显著增加,而T2区域性寒潮的频率则没有趋势变化. T1和T2区域性寒潮事件均与西伯利亚高压增强有关,然而与它们相关的对流层中层波列明显不同.在T1区域性寒潮事件发生期间,西伯利亚-蒙古上空出现负-正模态的500-hPa位势高度异常波列,削弱了东亚大槽,导致西伯利亚冷空气东移.T1区域寒潮频次增加趋势可能与全球变暖引起的500-hPa位势高度的线性趋势变化有关.与T2区域寒潮事件相关的波列则在乌拉尔山脉,蒙古和华北地区形成了脊-槽-脊环流异常,导致冷空气向东南方向入侵.本文得出结论,由于两类区域寒潮影响不同,西伯利亚高压增强和对流层中层波列模态在我国区域性寒潮事件的预报中应综合考虑.

关键词：寒潮 K-means聚类西伯利亚高压波列

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Alkaline hydrogen production promoted by small-molecule modification on flowerlike Co_(2)(OH)_(2)CO_(3)

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Journal of Energy Chemistry 2023年第9期84卷 73-80页

作者： Yue Liu Huan Zhang Chen Yang Ziyang Xu Yiyang Shi Xukun Zhu Xinde Duan Ling Qin Yachao Jin Li Song Mingdao Zhang Hegen Zheng Institute of Energy Supply Technology for High-end Equipment Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlJiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044JiangsuChina State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023JiangsuChina School of Chemistry and Chemical Engineering Hefei University of TechnologyHefei 230009AnhuiChina

Developing a low-cost and high-efficiency nonprecious metal-based catalyst for hydrogen evolution reaction(HER) is of great significance for the utilization of hydrogen *** this work,we report a molecular-modification strategy to fabricate a self-supported hydrogen evolution electrode,specially by grafting the macrocyclic molecules(HHTP=2,3,6,7,10,11-hexahydroxytriphenylene) on the surface of a cobaltous dihydroxy carbonate(COC) seed *** HHTP-COC electrode is endowed with a rodlike structure,which provides favorable access for charge transportation and mass *** macrocyclic molecule structure in HHTP can be grafted on COC and improve the electrical conductivity,while the interaction between HHTP and COC induces the rearrangement of charge configuration on the *** to the combination effects of several aspects,the HHTP-COC electrode achieves astonishing HER activity,with a low overpotential of 61.0 mV(η_(10),at the current density of 10 mA cm^(-2)) and excellent stability in alkaline *** kind of interface engineering based on the organic molecules can be applied to the design and manufacture of electrocatalysts in the field of energy conversion and storage.

关键词： Interfacial interaction Hydrogen evolution Molecule modification DFT calculation

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Air pollution health burden embodied in China's supply chains

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environmental Science and Ecotechnology 2023年第4期16卷 147-155页

作者： Hongyan Zhao Ruili Wu Yang Liu Jing Cheng Guannan Geng Yixuan Zheng Hezhong Tian Kebin He Qiang Zhang Center for Atmospheric Environmental Studies School of EnvironmentBeijing Normal UniversityBeijing100875China Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring China National Environmental Monitoring CentreBeijing100012China Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100012China

Product trade plays an increasing role in relocating production and the associated air pollution impact among sectors and *** a comprehensive depiction of atmospheric pollution redistribution through trade chains is missing,which may hinder targeted clean air cooperation among sectors and ***,we combined five state-of-the-art models from physics,economy,and epidemiology to track the anthropogenic fine particle matters(PM_(2.5))related premature mortality along the supply chains within China in *** results highlight the key sectors that affect PM_(2.5)-related mortality from both production and consumption *** consumption-based effects from food,light industry,equipment,construction,and services sectors,caused 2e22 times higher deaths than those from a production perspective and totally contributed 63%of the national *** a cross-boundary perspective,25.7%of China's PM_(2.5)-related deaths were caused by interprovincial trade,with the largest transfer occurring from the central and northern regions to well-developed east coast *** investment dominated the cross-boundary effect(56%of the total)by involving substantial equipment and construction products,which greatly rely on product exports from regions with specific *** supply chain-based analysis provides a comprehensive quantification and may inform more effective joint-control efforts among associated regions and sectors from a health risk perspective.

关键词： China Air pollution Mortality Trade Supply chain

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Multimodel ensemble projection of photovoltaic power potential in China by the 2060s

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atmospheric and Oceanic Science Letters 2023年第5期16卷 102-107页

作者： Xu Zhao Xu Yue Chenguang Tian Hao Zhou Bin Wang Yuwen Chen Yuan Zhao Weijie Fu Yihan Hu Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Colaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and EngineeringNanjing University of Information Science&Technology(NUIST)NanjingChina Climate Change Research Center Institute of Atmospheric Physics(IAP)Chinese Academy of Sciences(CAS)BeijingChina University of Chinese Academy of Sciences BejingChina

为了实现能源转型的目标,中国对太阳能的需求一直在极速增长.然而,太阳能发电潜力受到天气条件的影响并预期在气候变暖背景下发生改变.本文中,作者利用第六次国际耦合模式比较计划(CMIP6)24个气候模式的气象变量以及4个不同形式的光伏模... 详细信息

为了实现能源转型的目标,中国对太阳能的需求一直在极速增长.然而,太阳能发电潜力受到天气条件的影响并预期在气候变暖背景下发生改变.本文中,作者利用第六次国际耦合模式比较计划(CMIP6)24个气候模式的气象变量以及4个不同形式的光伏模型,预估了在2060年代低排放或高排放情况下中国的光伏发电潜力.多模式集合平均光伏功率在2004-2014年为277.2KWhm-2yr-1,并呈现出从西到东的下降趋势.到2054-2064年,在低排放情景下,全国平均光伏发电潜力将增加2.29%,而在高排放情景下则减少0.43%.低排放情景的排放控制大大增强了地表太阳辐射,促进了东部的光伏发电.相反,在高排放情景下,强烈的变暖对光伏发电产生了抑制作用.极端暖事件使光伏发电潜力在低排放情景下降低0.28%,而高排放情景下降低0.44%,分别相当于当代损失量的两倍和三倍.预估表明排放控制带来的清洁空气和适度变暖对中国未来的太阳能利用是有益的.

关键词：光伏发电气候变化极端暖事件第六次国际耦合模式比较计划集合预估

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Experimental and theoretical investigation on degradation of dimethyl trisulfide by ultraviolet/peroxymonosulfate: Reaction mechanism and influencing factors

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Journal of environmental Sciences 2023年第5期127卷 824-832页

作者： Jianing Sun Xiaodong Xin Shaohua Sun Zhenqi Du Zhenxing Yao Mingquan Wang Ruibao Jia Shandong Province Water Supply and Drainage Monitoring Center Jinan 250101China School of Water Conservancy and Environment University of JinanJinan 250022China State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

With a large amount of domestic sewage and industrial wastewater discharged into the water bodies,sulfur-containing organicmatter inwastewater produced volatile organic sulfide,such as dimethyl trisulfide(DMTS)throughmicroorganisms,caused the potential danger of drinking water safety and human *** present,there is still a lack of technology on the removal of *** this study,the ultraviolet/peroxymonosulfate(UV/PMS)advanced oxidation processes was used to explore the degradation of *** than 90%of DMTS(30μg/L)was removed under the conditions of the concentration ratio of DMTS to PMS was 3:40,the temperature(T)was 25±2℃,and 10 min of irradiation by a 200 W mercury lamp(365 nm).The kinetics rate constant k of DMTS reacting with hydroxyl radical(HO·)was determined to be 0.2477 min^(−1).Mn^(2+),Cu^(2+)and NO_(3)^(-)promoted the degradation of DMTS,whereas humic acid and Cl-in high concentrations inhibited the degradation *** chromatography-mass spectrometry was used to analyze the degradation products and the degradation intermediates were dimethyl disulfide and *** functional theory was used to predict the possible degradation mechanism according to the frontier orbital theory and the bond breaking mechanism of organic *** results showed that the S–S,C–S and C–H bonds in DMTS molecular structure were prone to fracture in the presence of free radicals,resulting in the formation of alkyl radicals and sulfur-containing radicals,which randomly combined to generate a variety of degradation products.

关键词： Ultraviolet/peroxymonosulfate Dimethyl trisulfide Products Density functional theory Degradation mechanism

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A MISR-Based Method for the Estimation of Particle Size Distribution:Comparison with AERONET over China

Journal of Remote Sensing

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Journal of Remote Sensing 2023年第1期3卷 97-109页

作者： Yanchuan Shao Riyang Liu Weihan Li Jun Bi Zongwei Ma State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjingJiangsuChina Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Nanjing University of Information Science&TechnologyNanjingJiangsuChina

Aerosol particle size has a crucial impact on the environment and public *** satellite-based regression models focus on the total amount of particles and are limited by surface *** study proposes an algorithm to derive the long-term normalized volume size distribution(VSD)of aerosol particles,which is independent of ground *** size distribution and aerosol optical depth of Multi-angle Imaging SpectroRadiometer(MISR)components are *** find the estimated MISR VSD is consistent with Aerosol Robotic Network(AERONET)observations,with R=0.56,0.54,0.59,and 0.68 for daily,monthly,seasonal,and annual *** stratified validations of radius,stations,and years further confirm the stable performance of derived VSD(R=0.28 to 0.73).The application of the random forest model demonstrates the potential improvements of predicted VSD by 10-fold cross-validation R=0.86 at the monthly *** apply MISR VSD to quantify the normalized volume of fractional aerosol particles at a resolution of 0.2°×0.2°during 2004 to 2016 in *** also calculate the proportion of small and medium particles to indicate the contribution of anthropogenic *** highest ratios are concentrated in the northeastern regions especially during winter while relatively lower in the Taklamakan Desert of western *** case study demonstrates that the application of MISR data can yield valuable and resolved size distributions of aerosol particles.

关键词： AERONET aerosol MISR

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Impacts of synoptic circulation on surface ozone pollution in a coastal eco-city in Southeastern China during 2014-2019

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Journal of environmental Sciences 2023年第5期127卷 143-157页

作者： Yu Yan Xuesong Wang Zhengchao Huang Kun Qu Wenbin Shi Zimu Peng Limin Zeng Shaodong Xie Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China International Joint Laboratory for Regional Pollution Control Ministry of EducationBeijing 100816China Center for Environmental Education and Communications of Ministry of Ecology and Environment Beijing 100020China Beijing Innovation Center for Engineering Science and Advanced Technology Peking UniversityBeijing 100871China CAS Center for Excellence in Regional Atmospheric Environment Chinese Academy of SciencesXiamen 361021China

The coastal eco-city of Fuzhou in Southeastern China has experienced severe ozone(O_(3))episodes at times in recent *** this study,three typical synoptic circulations types(CTs)that influenced more than 80%of O_(3) polluted days in Fuzhou during 2014-2019 were identified using a subjective *** characteristics of meteorological conditions linked to photochemical formation and transport of O_(3) under the three CTs were *** Air Quality Model with extensions was applied to simulate O_(3) episodes and to quantify O_(3) sources from different regions in *** Fuzhou was located to the west of a high-pressure system(classified as“East-ridge”),more warm southwesterly currents flowed to Fuzhou,and the effects of cross-regional transport from Guangdong province and high local production promoted the occurrence of O_(3) *** a uniform pressure field with a low-pressure system occurring to the east of Fuzhou(defined as“East-low”),stagnant weather conditions caused the strongest local production of O_(3) in the atmospheric boundary *** by high-pressure systems over the mainland(categorized as“Inland-high”),northerly airflows enhanced the contribution of cross-regional transport to O_(3) in *** abnormal increases of the“East-ridge”and“Inland-high”were closely related to O_(3) pollution in Fuzhou in April and May 2018,resulting in the annual maximum number of O_(3) polluted days during recent ***,the rising number of autumn O_(3) episodes in 2017-2019 was mainly related to the“Inland-high”,indicating the aggravation of cross-regional transport and highlighting the necessity of enhanced regional collaboration and efforts in combating O_(3) pollution.

关键词： Ozone pollution Synoptic circulation Regional transport Chemical production

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An innovative method based on Gaussian cloud distribution and sample information richness for eutrophication assessment of Yangtze’s lakes and reservoirs under uncertainty

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environmental Science and pollution Research 2024年第22期31卷 32784-32799页

作者： Zang, Nan Cao, Guozhi Xu, Yanxue Feng, Yu Xu, Zesheng Zhou, Xiafei Liao, Yunjie China National Environmental Monitoring Centre Beijing100012 China Chinese Academy for Environmental Planning Beijing100043 China Sinosoft Company Limited Beijing100089 China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

The precise assessment of a water body’s eutrophication status is essential for making informed decisions in water environment management. However, conventional approaches frequently fail to consider the randomness, fuzziness, and inherent hidden information of water quality indicators. These would result in an unreliable assessment. An enhanced method was proposed for the eutrophication assessment under uncertainty in this study. The multi-dimension gaussian cloud distribution was introduced to capture the randomness and fuzziness. The Shannon entropy based on various sample size and trophic levels was proposed to maximize valuable information hidden in the datasets. Twenty-seven significant lakes and reservoirs located in the Yangtze River Basin were selected to demonstrate the proposed method. The sensitivity and consistency were used to evaluate the accuracy of the proposed method. Results indicate that the proposed method has the capability to effectively assess the eutrophication status of lakes and reservoirs under uncertainty and that it has a better sensitivity since it can identify more than 33–50% trophic levels compared to the traditional methods. Further scenario experiments analysis revealed that the sample information richness, i.e., sample size and the number of trophic levels is of great significance to the accuracy/robustness of the method. Moreover, a sample size of 60 can offer the most favorable balance between accuracy/robustness and the monitoring expenses. These findings are crucial to optimizing the eutrophication assessment. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Eutrophication

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Insights into the seasonal characteristics of single particle aerosols in Chengdu based on SPAMS

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Journal of environmental Sciences 2025年第3期149卷 431-443页

作者： Junke Zhang Yunfei Su Chunying Chen Xinyi Fu Yuhan Long Xiaoxue Peng Xiaojuan Huang Gehui Wang Wei Zhang Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Department of Environmental Science&Engineering Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3)Fudan UniversityShanghai 200438China Key Lab of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Sichuan Ecological Environment Monitoring Station Chengdu 610091China

To investigate the seasonal characteristics in air pollution in Chengdu,a single particle aerosol mass spectrometry was used to continuously observe atmospheric fine particulate matter during one-month periods in summer and winter,*** results showed that,apart from O_(3),the concentrations of other pollutants(CO,NO_(2),SO_(2),PM_(2.5)and PM_(10))were significantly higher in winter than in *** single particle aerosols were divided into seven categories:biomass burning(BB),coal combustion(CC),Dust,vehicle emission(VE),K mixedwith nitrate(K-NO_(3)),Kmixed with sulfate and nitrate(K-SN),and K mixedwith sulfate(K-SO_(4))*** highest contributions in both seasons were VE particles(24%).The higher contributions of K-SO_(4)(16%)and K-NO_(3)(10%)particles occurred in summer and winter,respectively,as a result of their different formation mechanisms.S-containing(KSO_(4)and K-SN),VE,and BB particles caused the evolution of pollution in both seasons,and they can be considered as targets for future pollution *** mixing of primary sources particles(VE,Dust,CC,and BB)with secondary components was stronger in winter than in *** summer,as pollution worsens,the mixing of primary sources particles with 62[NO_(3)]−weakened,but themixing with 97[HSO_(4)]−***,in winter,the mixing state of particles did not exhibit an obvious evolution *** potential source areas in summer were mainly distributed in the southern region of Sichuan,while in winter,besides the southern region,the contribution of the western region cannot be ignored.

关键词： Single particle aerosols Chemical composition Mixing state Regional transport Seasonal characteristics

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