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Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4

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Nano Research 2019年第11期12卷 2749-2759页

作者： Qian Li Songcan Wang Zhuxing Sun Qijun Tang Yiqiu Liu Lianzhou Wang Haiqiang Wang Zhongbiao Wu Key Laboratory of Environment Remediation and Ecological Health Ministry of EducationCollege of Environmental and Resources ScienceZhejiang UniversityHangzhou 310058China Zhejiang Provincial Engineering Research Center of industrial Boiler and Furnace Flue Gas Pollutin Control Hangzhou 311202China Nanomaterials centre School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneQLD 4072Australia Schoo of Envionmental science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Graphitic carbon nitride(g-C3N4,CN)exhibits inefficient charge separation,deficient CO2 adsorption and activation sites,and sluggish surface reaction kinetics,which have been recognized as the main barriers to its application in CO2 photocatalytic *** this work,carbon quantum dot(CQD)decoration and oxygen atom doping were applied to CN by a facile one-step hydrothermal *** incorporated CQDs not only facilitate charge transfer and separation,but also provide alternative CO2 adsorption and activation ***,the oxygen-atom-doped CN(OCN),in which oxygen doping is accompanied by the formation of nitrogen defects,proves to be a sustainable H^+ provider by facilitating the water dissociation and oxidation *** of the synergistic effect of the hybridized binary CQDs/OCN addressing the three challenging issues of the CN based materials,the performance of CO2 photocatalytic conversion to CH4 over CQDs/OCN-x(x represents the volume ratio of laboratory-used H2O2(30 wt.%)in the mixed solution)is dramatically improved by 11 times at *** hybrid photocatalyst design and mechanism proposed in this work could inspire more rational design and fabrication of effective photocatalysts for CO2 photocatalytic conversion with a high CH4 selectivity.

关键词： photocalytic CO2 reduction graphitic carbon nitride(g-C3N4) carbon quantum dot oxygen doping

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Perturbation of clopyralid on bio-denitrification and nitrite accumulation:Long-term performance and biological mechanism

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environmental science and Ecotechnology 2022年第1期9卷 27-39页

作者： Suyun Sun Ya-Nan Hou Wei Wei Hafiz Muhammad Adeel Sharif Cong Huang Bing-Jie Ni Haibo Li Yuanyuan Song Caicai Lu Yi Han Jianbo Guo Tianjin Key Laboratory of Aquatic science and Technology School of Environmental and Municipal EngineeringTianjin Chengjian UniversityTianjin300384China National Technology Innovation Center of Synthetic Biology Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin300308China centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneySydneyNSW2007Australia College of Chemistry and environmental Engineering Shenzhen UniversityShenzhen518060China

The contaminant of herbicide clopyralid(3,6-dichloro-2-pyridine-carboxylic acid,CLP)poses a potential threat to the ecological ***,there is a general lack of research devoted to the perturbation of CLP to the bio-denitrification process,and its biological response mechanism remains ***,long-term exposure to CLP was systematically investigated to explore its influences on denitrification performance and dynamic microbial *** showed that low-concentration of CLP(<15 mg/L)caused severe nitrite accumulation initially,while higher concentrations(35e60 mg/L)of CLP had no further effect after long-term *** mechanistic study demonstrated that CLP reduced nitrite reductase(NIR)activity and inhibited metabolic activity(carbon metabolism and nitrogen metabolism)by causing oxidative stress and membrane damage,resulting in nitrite ***,after more than 80 days of acclimation,almost no nitrite accumulation was found at 60 mg/L *** was proposed that the secretion of extracellular polymeric substances(EPS)increased from 75.03 mg/g VSS at 15 mg/L CLP to 109.97 mg/g VSS at 60 mg/L CLP,which strengthened the protection of microbial cells and improved NIR activity and metabolic ***,the biodiversity and richness of the microbial community experienced a U-shaped *** relative abundance of denitrification-and carbon metabolism-associated microorganisms decreased initially and then recovered with the enrichment of microorganisms related to the secretion of EPS and N-acyl-homoserine lactones(AHLs).These microorganisms protected microbe from toxic substances and regulated their interactions among interand *** study revealed the biological response mechanism of denitrification after successive exposure to CLP and provided proper guidance for analyzing and treating herbicide-containing wastewater.

关键词： Denitrification Nitrite accumulation Clopyralid Membrane damage Metabolism activity Microbial community

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Recycling polymeric waste from electronic and automotive sectors into value added products

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Frontiers of environmental science & Engineering 2017年第5期11卷 55-64页

作者： Abhishek Kumar Veena Choudhary Rita Khanna Romina Cayumil Muhammad Ikram-ul-Haq Veena Sahajwalla Shiva Kumar I. Angadi Ganapathy E. Paruthy Partha S. Mukherjee Miles Park centre for Polymer science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India centre for Sustainable Materials Research and Technology (SMART) School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia CSIR- institute of Minerals and Materials Technology Advanced Materials Technology Department Bhubaneshwar Orissa 751013 India industrial Design Australian School of Architecture and Design The University of New South Wales Sydney NSW 2052 Australia

The environmentally sustainable disposal and recycling of ever increasing volumes of electronic waste has become a global waste management issue. The addition of up to 25% polymeric waste PCBs （printed circuit boards） as fillers in polypropylene （PP） composites was partially successful： while the tensile modulus, flexural strength and tlexural modulus of composites were enhanced, the tenstle and impact strengths were found to decrease. As a lowering of impact strength can significantly limit the application of PP based composites, it is necessary to incorporate impact modifying polymers such as rubbery particles in the mix. We report on a novel investigation on the simultaneous utilization of electronic and automotive rubber waste as fillers in PP composites. These composites were prepared by using 25 wt.% polymeric PCB powder, up to 9% of ethylene propylene rubber （EPR）, and PP： balance. The influence of EPR on the structural, thermal, mechanical and rheological properties of PP/PCB/ EPR composites was investigated. While the addition of EPR caused the nucleation of the I~ crystalline phase of PP, the onset temperature for thermal degradation was found to decrease by 8%. The tensile modulus and strength decreased by 1 b% and 19%, respectively; and the elongataon at break increased by -71%. The impact strength showed a maximum increase of-18% at 7 wt.%-9 wt.% EPR content. Various rheological properties were found to be well within the range of processing limits. This novel eco-friendly approach could help utilize significant amounts of polymeric electronic and automotive waste for fabricating valuable polymer composites.

关键词： E-waste Polymer composites Recycling RubberWaste PCBs Filler

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Compilation of hydrogeological map of China

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Journal of Groundwater science and Engineering 2020年第4期8卷 381-395页

作者： ZHANG Jian-kang DONG Hua CHENG Yan-pei YUE Chen LIU Kun institute of Hydrogeology and environmental Geology Information and Mapping Research CentreShijiazhuang050061China

Hydrogeological map is one of the important carriers of groundwater related *** directly reflects the hydrogeological conditions and previous investigation and research results of a mapping *** hydrogeological map of China is a map reflecting the characteristics of hydrogeology and groundwater dynamics on a national *** the basis of the hydrogeological map of China(1:4000000)compiled in 1988,this map compilation attempted to update and enhance the existing map,with the latest survey results from the project of National Investigation and Evaluation of Groundwater Resources and environmental problems led by China Geological *** of the mapping program included redefining groundwater types,quantifying the classification standard of the groundwater and adding the pore-fissure water in laterite layer of hilly *** multilayer structures for porous,karst and porous-fractured groundwater and their water-rich grades are reflected on the *** on the comprehensive summary of the latest hydrogeological data of China,this research conducts an in-depth analysis of the regional distribution characteristics of groundwater in China,utilizes a digital mapping process and establishes a cartographic database for the purpose of further *** the enrichment of the content and the continuous improvement of cognitive level,mapping content can be updated quickly,which has practical significance for the concept of surveying and mapping and scientific popularization.

关键词： Hydrogeology map Mapping methods Groundwater types Water-bearing degree Groundwater regional distribution characteristics

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Biochar affects methylmercury production and bioaccumulation in paddy soils: Insights from soil-derived dissolved organic matter

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Journal of environmental sciences 2022年第9期34卷 68-77页

作者： Siqi Zhang Mingxing Wang Jiang Liu Shanyi Tian Xueling Yang Guangquan Xiao Guomin Xu Tao Jiang Dingyong Wang Interdisciplinary Research centre for Agriculture Green Development in Yangtze River Basin Department of Environmental Sciences and EngineeringCollege of Resources and EnvironmentSouthwest UniversityChongqing 400716China State Key Laboratory of environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550002China Soil Ecology Laboratory College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China National Engineering Research Center for Compounding and Modification of Polymer Materials Guiyang 550014China Guizhou Material industrial Technology institute Guiyang 550014China institute of Environment and Health Jianghan UniversityWuhan 430056China

Biochar has been used increasingly as a soil additive to control mercury(Hg) pollution in paddy rice fields. As the most active component of soil organic matter, soil dissolved organic matter(DOM) plays a vital role in the environmental fate of contaminants. However, there are very few studies to determine the impact of biochar on the Hg cycle in rice paddies using insights from DOM. This study used original and modified biochar to investigate their effect on DOM dynamics and their potential impact on methylmercury(MeHg) production and bioaccumulation in rice plants. Porewater DOM was collected to analyze the variations in soil-derived DOM in paddy soils. The results showed that the addition of biochar, whether in original or modified form, significantly reduced the bioaccumulation of MeHg in rice plants, especially in hulls and grains( p < 0.05). However, MeHg production in soils was only inhibited by the modified biochar. Biochar addition induced a significant increase in DOM’s aromaticity and molecular weight( p < 0.05), which decreased Hg bioavailability. Furthermore, enhanced microbial activity was also observed in DOM( p < 0.05), further increasing MeHg production in the soil. Thus, the effect of biochar on the fate of Hg cycle involves competition between the two different roles of DOM. This study identified a specific mechanism by which biochar affects Hg behavior in rice paddy soil and contributes to understanding the more general influence of biochar in agriculture and contaminant remediation.

关键词： Dissolved organic matter Mercury Methylmercury Biochar Rice

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Experiments and modelling of phenanthrene biodegradation in the aqueous phase by a mixed culture

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Journal of environmental sciences 2006年第1期18卷 147-153页

作者： LIU Xiang MAO Xiao-min YANG Jian-gang D.A. Barry LI Ling Department of environmental science and Engineering Tsinghua University Beijing 100084 China Contaminated Land Assessment and Remediation Research centre Institute for Infrastructure and Environment School of Engineering and Electronics The University of Edinburgh Edinburgh EH9 3JL United Kingdom Chinese Academy of Transportation sciences Ministry of Communications Beijing 100029 China environmental Engineering Division School of Engineering the University of Queensland St. Lucia QLD 4072 Australia centre for Eco-environmental Modelling Hohai University Nanjing 210098. China

Pollution by polycyclic aromatic hydrocarbons（PAHs） is widespread due to tmsuitable disposal of industrial waste. They are mostly defined as priority pollutants by environmental protection authorities worldwide. Phenanthrene, a typical PAH, was selected as the target in this paper. The PAH-degrading mixed culture, named ZM, was collected from a petroleum contaminated river bed. This culture was injected into phenanthrene solutions at different concentrations to quantify the biodegradation process. Results show near-complete removal of phenanthrene in three days of biodegradation if the initial phenanthrene concentration is low. When the initial concentration is high, the removal rate is increased but 20%-40% of the phenanthrene remains at the end of the experiment. The biomass shows a peak on the third day due to the combined effects of microbial growth and decay. Another peak is evident for cases with a high initial concentration, possibly due to production of an intermediate metabolite. The pH generally decreased during biodegradation because of the production of organic acid. Two phenomenological models were designed to simulate the phenanthrene biodegradation and biomass growth. A relatively simple model that does not consider the intermediate metabolite and its inhibition of phenanthrene biodegradation cannot fit the observed data. A modified Monod model that considered an intermediate metabolite （organic acid） and its inhibiting reversal effect reasonably depicts the experimental results.

关键词： biodegradation model phenanthrene microbial growth and decay Monod growth model

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Migration mechanism and risk assessment of perand polyfluoroalkyl substances in the Ya'Er Lake oxidation pond area,China

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Journal of environmental sciences 2024年第2期136卷 301-312页

作者： Chang Li Huifang Zhong Jing Wu Lingyi Meng Yingjun Wang Chunyang Liao Yawei Wang Yujian He University of Chinese Academy of sciences Beijing 100049China Research Center for Eco-environmental sciences Chinese Academy of SciencesBeijing 100085China institute of Biomedical and Health Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China China National environmental Monitoring centre Beijing 100012China Hubei Key Laboratory of environmental and Health Effects of Persistent Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

The migration mechanisms,sources,and environmental risks of 29 legacy and emerging perfluorinated and polyfluoroalkyl species present in an oxidation pond(Ya'Er Lake)were investigated for treating sewage based on the analysis of their occurrence and *** concentration of per-and polyfluoroalkyl substances(PFAS)in pond area was between0.30 and 63.2 ng/g dw(dry weight),with the overall average concentration of 8.00 ng/g ***,the PFAS concentrations in the surface sediments near the sewage outlet in Pond-1(50.2 ng/g dw)and Pond-5(average 15.1 ng/g dw)were 1–2 orders of magnitude higher than those in other *** general,the legacy PFAS,i.e.,perfluorooctane sulfonic acid was considered to be the major pollutant in the polluted area,on average,accounting for 73.0%of the total concentration of PFAS *** evaluating the regional distribution of different PFAS homologs,the short-chain PFAS pollutants with lower K_(ow)were found to migrate farther in both horizontal and vertical *** sewage outlets in Pond-1 and Pond-5are the main pollution sources in polluted area and the emerging PFAS pollutants in Pond-5have replaced the legacy PFAS pollutants as the main *** on positive matrix factorization analysis,three main industrial sources of PFAS pollutants in the study area were identified:protective coating,fire-fighting,and food packaging ***,the environmental risk assessment results showed that most study areas exhibited medium environmental risk(0.01≤Risk quotient(RQ)<1),indicating that the ecological environment risks in this area need further attention.

关键词： Perfluoroalkyl substances Distribution Migration mechanism Risk assessment

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CO_(2) mineralization by typical industrial solid wastes for preparing ultraﬁne CaCO_(3): A review

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Green Energy & Environment 2024年第11期9卷 1679-1697页

作者： Run Xu Fuxia Zhu Liang Zou Shuqing Wang Yanfang Liu Jili Hou Chenghao Li Kuntong Song Lingzhao Kong Longpeng Cui Zhiqiang Wang Department of Coal and Syngas Conversion Sinopec Research Institute of Petroleum Processing CO.Ltd.Beijing100083China School of environmental science and Engineering Suzhou University of Science and TechnologySuzhou215000China

Mineral carbonation is a promising CO_(2) sequestration strategy that can utilize industrial wastes to convert CO_(2) into high-value CaCO_(3).This review summarizes the advancements in CO_(2) mineralization using typical industrial wastes to prepare ultraﬁne CaCO_(3).This work surveys the mechanisms of CO_(2) mineralization using these wastes and its capacities to synthesize CaCO_(3),evaluates the effects of carbonation pathways and operating parameters on the preparation of CaCO_(3),analyzes the current industrial application status and economics of this *** to the large amount of impurities in solid wastes,the purity of CaCO_(3) prepared by indirect methods is greater than that prepared by direct *** CaCO_(3) includes three *** polymorph of CaCO_(3) synthesized by carbonation process is determined the combined effects of various *** parameters essentially impact the nucleation and growth of CaCO_(3) by altering the CO_(2) supersaturation in the reaction system and the surface energy of CaCO_(3) *** the initial pH of the solution and the CO_(2)ﬂow rate favors the formation of vaterite,but calcite is formed under excessively high *** formation is favored at lower temperatures and residence *** increased temperature and prolonged residence time,it passes through aragonite metastable phase and eventually transforms into ***,polymorph modiﬁers can decrease the surface energy of CaCO_(3) grains,facilitating the synthesis of ***,the large-scale application of this technology still faces many problems,including high costs,high energy consumption,low calcium leaching rate,low carbonation efﬁciency,and low product ***,it is necessary to investigate ways to accelerate carbonation,optimize operating parameters,develop cost-effective agents,and understand the kinetics of CaCO_(3) nucleation and crystallization to obtain products with speciﬁc crystal ***

关键词： industrial solid wastes Resource utilization Mineral carbonation Ultraﬁne CaCO_(3) Carbon emission reduction

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Definitions and progress of ecosystem health and ecological security

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Ecological Economy 2006年第3期2卷 327-336页

作者： Weng Changhua Zhang Luoping David Klumpp environmental science Research centre Xiamen University Xiamen 361005 P. R. China Australian institute of Marine science PMB NO.3 Townsville MC Qld 4810 Australia

Along with industrial development, adverse impacts on the natural environment become more serious, and the states of ecosystem health and ecological security have also deteriorated. As the basic needs for human survival, ecosystem health and ecological security possess very important meanings. Therefore, ecosystem health and ecological security have become research hot topics in recent decades. This paper reviewed the developments of definitions and applications of ecosystem health and ecological security, and found that the research on ecosystem health had achieved a lot. However, the research on ecological security was still relatively undeveloped. Moreover, there are also some confusion between the concepts of ecosystem health and ecological security. We consider that ecosystem health indicates the status of the ecosystem in normal conditions, whereas, ecological security indicates the capabilities of an ecosystem to react to external accidents or extremely adverse effects. An ecosystem which is healthy does not mean that it is secure. However, the ecological security requires an ecosystem to possess the capacity for integrity against any risk, and ecosystem health is the precondition to ecological security.

关键词： Ecosystem health Ecological security Definition Research progress

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Ceftriaxone sodium degradation by carbon quantum dots(CQDs)-decorated C-doped a-Bi_(2)O_(3) nanorods

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environmental science and Ecotechnology 2023年第1期13卷 96-106页

作者： Xianbo Sun Ying Pan Yanyu Song Wen Liu Long D.Nghiem Qilin Wang Zhengqing Cai National Engineering Research Center of industrial Wastewater Detoxication and Resource Recovery East China University of Science and TechnologyShanghai200237China The Key Laboratory of Water and Sediment sciences Ministry of EducationCollege of Environmental Sciences and EngineeringPeking UniversityBeijing100871China centre for Technology in Water and Wastewater School of Civil and Environmental EngineeringUniversity of Technology SydneyUltimoNSW2007Australia Shanghai institute of Pollution Control and Ecological Security Shanghai200237China

A novel carbon quantum dots decorated C-doped a-Bi_(2)O_(3)photocatalyst(CBO/CQDs)was synthesized by solvothermal *** synergistic effect of adsorption and photocatalysis highly improved contaminants removal *** ceftriaxone sodium degradation rate constant(k)of CBO/CQDs was 11.4 and 3.2 times that of pure a-Bi2O3 and C-doped a-Bi_(2)O_(3),*** interstitial carbon doping generated localized states above the valence band,which enhanced the utilization of visible light and facilitated the separation of photogenerated electrons and holes;the loading of CQDs improved the charge carrier separation and extended the visible light response;the reduced particle size of CBO/CQDs accelerated the migration of photogenerated ***·O2-and ht were identified as the dominant reactive species in ceftriaxone sodium degradation,and the key role of·O2-was further investigated by NBT transformation *** Fukui index was applied to ascertain the molecular bonds of ceftriaxone sodium susceptible to radical attack,and intermediates analysis was conducted to explore the possible degradation *** toxicity evaluation revealed that some degradation intermediates possessed high toxicity,thus the contaminants require sufficient mineralization to ensure safe *** present study makes new insights into synchronous carbon dopping and CQDs decoration on modification of a-Bi2O3,which provides references for future studies.

关键词： Photocatalytic Antibiotics C-doped Carbon quantum dots Toxicity assessment

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