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Cobalt doping amount determines dominant reactive species in peroxymonosulfate activation via porous carbon catalysts co-doped by cobalt and nitrogen

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Journal of environmental sciences 2024年第4期138卷 212-226页

作者： Xiang Li Limeng Wu Aiqin Zhang shaohua Wu Yan Lin Chunping Yang key laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Academy of environmental and Resource sciences School of Environmental Science and EngineeringGuangdong University of Petrochemical TechnologyMaoming 525000China College of environmental science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University)Ministry of EducationChangsha 410082China

switching the reaction routes in peroxymonosulfate(PMs)-based advanced oxidation processes have attracted much attention but remain ***,a series of Co-N/C catalysts with different compositions and structures were prepared by using bimetallic zeolitic imidazolate frameworks based on ZIF-8 and ZIF-67(x Zn/Co-ZIFs).Results show that Co doping amount could mediate the transformation of the activation pathway of PMs over CoN/*** Co doping amount was less than 10%,the constructed x Co-N/C/PMs system(x≤10%)was singlet oxygen-dominated reaction;however further increasing Co doping amount would lead to the generation and coexistence of sulfate radicals and high-valent cobalt,besides singlet ***,the nitrogen-coordinated Co(Co-NX)sites could serve as main catalytically active sites to generate singlet *** excess Co doping amount caused the formation of Co nanoparticles from which leached Co ions were responsible for the generation of sulfate radicals and high-valent *** to undoped N/C,Co doping could significantly enhance the catalytic *** 0.5%Co-N/C could achieve the optimum degradation(0.488 min^(-1))and mineralization abilities(78.4%)of sulfamethoxazole among the investigated Co-N/C catalysts,which was superior to most of previously reported *** addition,the application prospects of the two systems in different environmental scenarios(pH,inorganic anions and natural organic matter)were assessed and showed different degradation *** study provides a strategy to regulate the reactive species in PMs-based advanced oxidation process.

关键词： Peroxymonosulfate sulfate radical singlet oxygen Cobalt Zeolitic imidazolate framework Advanced oxidation process

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stability assessment of tree ring growth of Pinus armandii Franch in response to climate change based on slope directions at the Lubanling in the Funiu Mountains,china

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Journal of Forestry Research 2024年第3期35卷 197-208页

作者： Jinkuan Li Jianfeng Peng Xiaoxu Wei Meng Peng Xuan Li Yameng Liu Jiaxin Li College of Geography and environmental science Henan UniversityKaifeng 475004People’s Republic of China key laboratory of Earth system Observation and simulation of Henan Province Kaifeng 475004People’s Republic of China

Global warming will affect growth strategies and how trees will *** compare the response of tree radial growth to climate warming in different slope directions,samples of Pinus armandii Franch were collected and treering chronologies developed on northern and western slopes from the Lubanling in the Funiu *** analyses showed that two chronologies were mainly limited by temperatures in the previous June–August and the combination of temperatures and moisture in the current May–*** difference of the climate response to slopes was small but not *** growth of the LBL01 site on the northern slope was affected by the combined maximum and minimum temperatures,while that of the LBL02 site was affected by maximum *** regards to moisture,radial growth of the trees on the north slope was influenced by the relative humidity in the current May–July,while on the western slope,it was affected by the relative humidity in the previous June–August,the current May–July and the precipitation in the current May–*** the change in climate,the effects of the main limiting factors on growth on different slopes were visible to a certain extent,but the differences in response of trees on different slopes gradually decreased,which might be caused by factors such as different slope directions and the change in diurnal temperature *** results may provide information for forest protection and ecological construction in this region,and a scientific reference for future climate reconstruction.

关键词： Tree ring width Lubanling Pinus armandii Franch slope direction Climate response

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Future Changes in Various Cold surges over china in CMIP6 Projections

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Advances in Atmospheric sciences 2024年第9期41卷 1751-1768页

作者： Li MA Zhigang WEI Xianru LI shuting WU key laboratory of environmental Change and Natural Disasters of Chinese ministry of education Beijing Normal UniversityBeijing 100875China state key laboratory of Earth surface Processes and Resource Ecology(EsPRE) Beijing Normal UniversityBeijing 100875China Academy of Disaster Reduction and Emergency Management Ministry of Emergency Management and Ministry of EducationBeijing 100875China Faculty of Geographical science Beijing Normal UniversityBeijing 100875China

Cold surges(Css)often occur in the mid-latitude regions of the Northern Hemisphere and have enormous effects on socioeconomic *** report that the occurrences of Css and persistent Css(PCss)have rebounded since the 1990s,but the trends related to the frequencies of strong Css(sCss)and extreme Css(ECss)changed from increasing to decreasing after *** highest-ranked model ensemble approach was used to project the occurrences of various Css under the ssP1-2.6,ssP2-4.5,and ssP5-8.5 *** frequencies of the total Css show overall decreasing ***,under the ssP1-2.6 scenario,slight increasing trends are noted for sCss and ECss in *** circulations that are characterized by an anomalous anticyclonic circulation with a significantly positive 500-hPa geopotential height(Z500)anomaly at high latitudes along with significant negative anomalies in china were favorable for cold air intrusions into *** addition,the frequencies of all Cs types under the sPP5-8.5 scenario greatly decreased in the long term(2071-2100),a finding which is thought to be related to negative ssT anomalies in the central and western North Pacific,differences in sea level pressure(sLP)between high-and mid-latitude regions,and a weaker East Asian *** terms of ECss,the decreasing trends observed during the historical period were maintained until 2024 under the ssP1-2.6 *** to the ssP1-2.6 scenario,the Z500 pattern showed a trend of strengthened ridges over the Ural region and northern East Asia and weakened troughs over siberia(60°-90°E)under the ssP2-4.5 and ssP5-8.5 scenarios,contributing to the shift to increasing trends of ECss after 2014.

关键词： cold surge “highest-ranked”model ensemble anticyclonic circulation geopotential height china

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Differences in spring precipitation over southern china associated with multiyear La Ni?a events

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Acta Oceanologica sinica 2024年第2期43卷 1-10页

作者： Guangliang Li Licheng Feng Wei Zhuang Fei Liu Ronghua Zhang Cuijuan sui National Marine environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China state key laboratory of Marine environmental science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China southern Marine science and Engineering Guangdong laboratory(Zhuhai) Zhuhai 519082China key laboratory of Tropical Atmosphere-Ocean system of ministry of education/school of Atmospheric sciences Sun Yat-Sen UniversityZhuhai 519082China school of Marine sciences Nanjing University of Information Science and TechnologyNanjing 210044China

Composite analyses were performed in this study to reveal the difference in spring precipitation over southern china during multiyear La Ni?a events during 1901 to 2015. It was found that there is significantly below-normal precipitation during the first boreal spring, but above-normal precipitation during the second year. The difference in spring precipitation over southern china is correlative to the variation in western North Pacific anomalous cyclone(WNPC), which can in turn be attributed to the different sea surface temperature anomaly(ssTA) over the Tropical Pacific. The remote forcing of negative ssTA in the equatorial central and eastern Pacific and the local air-sea interaction in the western North Pacific are the usual causes of WNPC formation and *** in the first spring is stronger than those in the second spring. As a result, the intensity of WNPC in the first year is stronger, which is more likely to reduce the moisture in southern china by changing the moisture transport, leading to prolonged precipitation deficits over southern china. However, the tropical ssTA signals in the second year are too weak to induce the formation and maintenance of WNPC and the below-normal precipitation over southern china. Thus, the variation in tropical ssTA signals between two consecutive springs during multiyear La Ni?a events leads to obvious differences in the spatial pattern of precipitation anomaly in southern china by causing the different WNPC response.

关键词： multiyear La Nina precipitation anomaly anomalous western North Pacific cyclone southern china

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A unique subseafloor microbiosphere in the Mariana Trench driven by episodic sedimentation

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Marine Life science & Technology 2024年第1期6卷 168-181页

作者： Jiwen Liu Da-Wei Li Xinxin He Ronghua Liu Haojin Cheng Chenglong su Mengna Chen Yonghong Wang Zhongsheng Zhao Hanyue Xu Zhangyu Cheng Zicheng Wang Nikolai Pedentchouk David J.Lea-smith Jonathan D.Todd Xiaoshou Liu Meixun Zhao Xiao-Hua Zhang Frontiers science Center for Deep Ocean Multispheres and Earth system and College of Marine Life SciencesOcean University of ChinaQingdao 266003China laboratory for Marine Ecology and environmental science Laoshan LaboratoryQingdao 266237China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China key laboratory of Marine Chemistry Theory and Technology Ministry of EducationOcean University of ChinaQingdao 266100China key Lab of submarine Geosciences and Prospecting Techniques Ministry of Education/College of Marine GeosciencesOcean University of ChinaQingdao 266100China key laboratory of Physical Oceanography Ministry of Education/Research Vessel CentreOcean University of ChinaQingdao 266100China school of environmental sciences University of East AngliaNorwich NR47TJUK school of Biological sciences University of East AngliaNorwich NR47TJUK

Hadal trenches are characterized by enhanced and infrequent high-rate episodic sedimentation events that likely introduce not only labile organic carbon and key nutrients but also new microbes that significantly alter the subseafloor ***,the role of high-rate episodic sedimentation in controlling the composition of the hadal subseafloor microbiosphere is ***,analyses of carbon isotope composition in a~750 cm long sediment core from the Challenger Deep revealed noncontinuous deposition,with anomalous ^(14)C ages likely caused by seismically driven mass transport and the funneling effect of trench *** community composition and diverse enzyme activities in the upper~27 cm differed from those at lower depths,probably due to sudden sediment deposition and differences in redox condition and organic matter *** lower depths,microbial population numbers,and composition remained relatively constant,except at some discrete depths with altered enzyme activity and microbial phyla abundance,possibly due to additional sudden sedimentation events of different *** is provided of a unique role for high-rate episodic sedimentation events in controlling the subsurface microbiosphere in Earth’s deepest ocean floor and highlight the need to perform thorough analysis over a large depth range to characterize hadal benthic *** depositional processes are likely crucial in shaping deep-water geochemical environments and thereby the deep subseafloor biosphere.

关键词： Hadal subseafloor Deep water sediment Mariana Trench Radiocarbon Microbial community Redox potential

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Photochemical Production of Methyl Halides with Guaiacol as the Precursor

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Journal of Ocean University of china 2024年第5期23卷 1275-1286页

作者： YANG Fan ZHANG Yan WU Guanyu HE Zhen YANG Guipeng Frontiers science Center for Deep Ocean Multispheres and Earth system Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China laboratory for Marine Ecology and environmental science Qingdao Marine Science and Technology Center Institute of Marine Chemistry Ocean University of China

Methyl halides are crucial trace greenhouse gases in the atmosphere, playing a significant role in global climate change and the atmospheric environment. This study investigated the photochemical production of methyl halides in an artificial seawater system using guaiacol as a precursor through laboratory simulation experiments. The influences of various environmental factors, including illumination time, radiation wavebands, illumination intensity, concentrations of guaiacol and halide ions（X-）, Fe3+, salinity, dissolved oxygen（DO）, and pH value on the photochemical production of methyl halides were examined. We demonstrated that increased illumination intensity and duration promote the photochemical production of methyl halides, with a notable enhancement under UV-B radiation. Guaiacol and halide ions were identified as key precursors, and their high concentrations facilitated the formation of methyl halides. Additionally, different types of halide ions exhibited a competitive relationship in producing methyl halides. The study found that an increase in pH inhibited the photochemical formation of CH3I due to the reaction between OH-and ·CH3. Dissolved oxygen was found to inhibit the photochemical formation of CH3I while promoting the formation of CH3Cl. Conversely, an appropriate concentration of Fe3+enhanced the photochemical production of methyl halides. Field observations indicated a high photochemical production of methyl halides in the natural waters near Qingdao's coastal area, likely due to the high concentration of dissolved organic matter（DOM）, which supports photochemical reactions. Furthermore, the photochemical production of methyl halides in natural seawater was significantly higher than in dark conditions, underscoring the importance of illumination in promoting these photochemical processes in seawater.

关键词： dissolved organic matter guaiacol methyl halides photochemical production

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Comprehensive insight into the occurrence characteristics,influencing factors and risk assessments of antibiotics in the Chaohu Basin

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Frontiers of environmental science & Engineering 2024年第5期18卷 57-71页

作者： shuanggang Hu Hongzhi Zhang Yongjie Yang Kangping Cui Junjie Ao Xuneng Tong Mengchen shi Yi Wang Xing Chen Chenxuan Li Yihan Chen school of Resources and environmental Engineering Hefei University of TechnologyHefei230009China ministry of education-shanghai key laboratory of Children’s environmental Health Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghai200092China Department of Civil & environmental Engineering National University of SingaporeSingapore117576Singapore College of Resources and Environment Anhui Agricultural UniversityHefei230036China

The pollution of antibiotics in aquatic environments has received extensive ***,research on antibiotic contamination in river-lake systems,a significant form of modern aquatic environments,still needs to be *** study focuses on the Chaohu Basin(china)investigating the occurrence characteristics,influencing factors,and risk assessments of antibiotics in the river-lake *** total antibiotic concentrations in the water phase and sediment phase were 3.14–1887.49 ng/L and 0.92–1553.75 ng/g,*** was the predominant antibiotic in the water phase,whereas tetracycline prevailed in the sediment *** differences in concentration and structural composition of antibiotics between the tributaries(river system)and Chaohu Lake were observed,indicating the involvement of various geochemical processes in the attenuation of antibiotics during transport to the receiving *** analysis suggested that the western river is the primary source of antibiotics in Chaohu *** nutrient influx in heavily polluted areas is crucial to addressing the escalating issue of antibiotic pollution in the river-lake *** widespread occurrence of clindamycin in the waters is likely due to wastewater treatment plant discharges,and high-intensity human activities continue to exacerbate antibiotic *** assessment indicated that sulfamethoxazole,tetracycline,lincomycin,and clindamycin ranked in the top four with the highest risks to the most sensitive aquatic ***,the antibiotics presented no risk to consumer *** study provides valuable insights for controlling antibiotic pollution in riverlake systems.

关键词： Antibiotics Occurrence characteristics Influencing factors Risk assessments River-lake system

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跨欧亚大陆交流的响应——新石器至青铜时代中国北方农业区、牧业区和农牧交错带生业模式演变过程及影响因素

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Journal of Geographical sciences 2024年第4期34卷 681-698页

作者：董广辉梁欢芦永秀王佳 key laboratory of western china's environmental systems(ministry of education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Zhaotong University Zhaotong 657000YunnanChina

significant spatiotemporal variation in human livelihood patterns and its relationship to trans-Eurasian exchange and climate change in north china during the late Neolithic and Bronze Age, has been intensively studied in recent years, but the comprehensive influence of natural and social factors on this variation is not well understood. Therefore, we analyze archaeobotanical, zooarchaeological and carbon isotopic data from late Neolithic and Bronze Age sites in agricultural, pastoral, and agro-pastoral regions of north china. Our results demonstrate human subsistence strategies transformed at different speeds in these three geographic areas after wheat, barley, and sheep, goats, and cattle were introduced into north china. Introduced crops and livestock dominated human livelihoods in pastoral regions and became important subsistence in areas above ~1500 m a.s.l. in agro-pastoral regions after ~3600 BP. In agricultural regions, indigenous millet crops were the most important subsistence throughout 6000– 2200 BP, but wheat use increased significantly around 2700 BP. Our study suggests that the introduction of new crops and herbivorous livestock related to the prehistoric trans-Eurasian exchange, and their adaptive advantage in high-cold environments might have rapidly facilitated human adaptability and social development in pastoral regions and northwest margin of agro-pastoral regions during the Bronze Age.

关键词： subsistence strategy 6th–3rd Millennium BP north china human-land relation long-distance exchange

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Amelioration of habitat since the early Holocene contributed to the origin of agriculture in the farming-pastoral zone of northern china

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science china Earth sciences 2024年第8期67卷 2535-2546页

作者： Xin JIA Zhiping ZHANG Yonggang sUN Runqi JIANG shuangwen YI Wei CHEN Jue sUN Guoqiang LI shuzhi WANG Enrui LI Xiaonong HU Qingchun BAO Harry F.LEE Huayu LU Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China schlool of History and Culture Chifeng UniversityChifeng 024000China school of Geography and Ocean science Nanjing UniversityNanjing 210023China state key laboratory of Palaeobiology and stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China key laboratory of western china’s environmental systems(ministry of education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Archaeology Chinese Academy of Social SciencesBeijing 100710China Ulanqab Museum Ulanqab 012000China The Institute of Cultural Relics and Archaeology Hohhot 010011China Department of Geography and Resource Management The Chinese University of Hong KongHong Kong 999077China key laboratory of Virtual Geographic Environment(ministry of education of PRC) Nanjing Normal UniversityNanjing 210023China school of Geography Nanjing Normal UniversityNanjing 210023China Institute of environmental Archaeology Nanjing Normal UniversityNanjing 210023China

The origin of agriculture in the farming-pastoral zone of northern china remains in *** central region of the Inner Mongolia Plateau is located in the core area of the farming-pastoral zone;thus,it is a critical region for exploring the origin of the dryland farming system in northern *** study selected the Yumin site and Banan site,which belong to the Yumin Culture-the beginning of Neolithic culture in Inner Mongolia-as the research *** on the quartz optically stimulated luminescence(OsL)dating on the sedimentary sections from the Yumin site(YM)and Banan site(BN1 and BN2),the Holocene chronology framework of each section was *** that,by identifying carbonized grains in the Yumin site and the multi-proxy analysis of each section,we investigated the relationship between the origin of agriculture and climate change in this *** results revealed that the timing of the origin of agriculture recorded in the Yumin site lagged behind the timing of a significant increase of precipitation during the early Holocene but coincided with the timing of a significant increase of vegetation around 8.4 *** phenomenon was further confirmed by the published high-resolution paleoenvironmental records from the surrounding area of the Yumin *** propose that with the gradual amelioration of hydrothermal conditions since the beginning of the Holocene,the regional ecosystem had been improved,resulting in the gradual conversion of the land surface from infertile sand to organic-rich soil,providing an appropriate environmental foundation for the origin of dryland farming in northern china around 8.4 *** study highlighted that the“accumulative environmental effects”during the early Holocene played a vital role in the origin of agriculture in northern china and provided a reference for agricultural management in the context of future climate change.

关键词： Origin of agriculture Accumulative environmental effects Yumin Culture Northern china Holocene

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Peracetic acid catalytic activation using Co3O4 nanocluster decorated graphitic carbon nitride for cefapirin degradation in water

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science china Technological sciences 2024年第10期67卷 3103-3115页

作者： YIN shiMei GAO YiXuan CHEN Long LI Fan LIU XiaoNa QI Fei LIU Wen Beijing key Lab for source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry University key laboratory of Water and sediment sciences (ministry of education) College of Environmental Sciences and EngineeringPeking University school of environmental science and Engineering Taiyuan University of Technology state environmental Protection key laboratory of All Material Fluxes in River Ecosystems Peking University Beijing National laboratory for Molecular sciences Peking University

This study innovated cobalt-based catalytic nanocomposites（CCNs） for the heterogeneous activation of peracetic acid（PAA）,a green and efficient advanced oxidation process for removing antibiotics from *** Co3O4catalysts exhibit limited activity due to stable electronic *** overcome this,CCNs were synthesized using a one-step condensation method,incorporating a size control strategy that anchors Co3O4nanoclusters within 4-5 nm onto six-fold cavity of g-C3N4,simultaneously modifying the coordination environment of *** alteration significantly enhances the adsorption energy of PAA and catalytic activity compared to commercial *** improved performance of CCN2,in particular,is attributed to a shift in the cobalt d band center towards the Fermi level,facilitating electron delocalization and transfer,enhancing Co-O bonding,and accelerating PAA ***2's superior activity,with a cefapirin（CFP） degradation kinetic rate constant(k1=0.760 min-1)～11 times that of PAA direct oxidation(k1=0.070 min-1) and～5 times that of commercial Co3O4/PAA system(k1=0.164 min-1),is due to its ability to generate dominant reactive species for antibiotic degradation,including alkoxy radicals(CH3C（=O）OO·),high valence metal(CoⅣ（=O）2+),and singlet oxygen（1O2）,with the latter two being crucial for the degradation *** degradation of CFP involved three mechanisms,including direct oxidation by PAA,decarboxylation,and open-ring reactions at nitrogen *** research provides insights into developing high-activity catalysts for efficient PAA activation and antibiotic removal,leveraging the strategy of shifting the transition metal d band center.

关键词： peracetic acid Co3O4 nanocluster high valence metal singlet oxygen cefapirin

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