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Investigation of suitable precursors for manganese oxide catalysts in ethyl acetate oxidation

Journal of environmental Sciences 2021年第6期33卷 17-26页

作者： Yan Zhang Meng Wang Shunyu Kang Tingting Pan Hua Deng 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 Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationChinese Academy of SciencesNingbo 315800China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The control of ethyl acetate emissions from fermentation and extraction processes in the pharmaceutical industry is of great importance to the *** have developed three Mn_(2)O_(3)catalysts by using different Mn precursors(MnCl_(2),Mn(CH_(3)COO)_(2),MnSO_(4)),named as Mn_(2)O_(3)-Cl,-Ac,-SO_(4).The tested catalytic activity results showed a sequence with Mn precursors as:Mn_(2)O_(3)-Cl>Mn_(2)O_(3)-Ac>Mn_(2)O_(3)-SO_(4).The Mn_(2)O_(3)-Cl catalyst reached a complete ethyl acetate conversion at 212℃(75℃lower than that of Mn_(2)O_(3)-SO_(4)),and this high activity 100%could be maintained high at 212℃for at least 100 *** characterization data about the physical properties of catalysts did not show an obvious correlation between the structure and morphology of Mn_(2)O_(3)catalysts and catalytic performance,neither was the surface area the determining factor for catalytic activity in the ethyl acetate *** we firstly found there is a close linear relationship between the catalytic activity and the amount of lattice oxygen species in the ethyl acetate oxidation,indicating that lattice oxygen species were essential for excellent catalytic *** H_(2)temperature-programmed reduction(H_(2)-TPR)results,we found that the lowest initial reduction temperature over the Mn_(2)O_(3)-Cl had stronger oxygen mobility,thus more oxygen species participated in the oxidation reaction,resulting in the highest catalytic *** convenient preparation,high efficiency,and stability,Mn_(2)O_(3)prepared with MnCl_(2)will be a promising catalyst for removing ethyl acetate in practical application.

关键词： Ethyl acetate Catalytic oxidation Manganese Precursor Lattice oxygen species

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Nitrous oxide emissions and microbial communities variation in low dissolved oxygen and low carbon-to-nitrogen ratio anoxic–oxic wastewater treatment plant

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environmental Science and pollution Research 2024年第30期31卷 42779-42791页

作者： Yan, Wanli Li, Jianguo Gu, Lide Ye, Chengsong Liang, Jieping Fu, Jinjin Zheng, Shikan Yu, Xin College of the Environment and Ecology Xiamen University Xiamen361005 China Fujian Key Laboratory of Coastal Pollution Prevention and Control Xiamen University Xiamen361005 China State Key Laboratory of Marine Environmental Science and College of Ocean and Earth Sciences Xiamen University Xiamen361005 China School of Life Sciences Xiamen University Xiamen361005 China

Dissolved oxygen (DO) levels and carbon-to-nitrogen (C/N) ratio affect nitrous oxide (N2O) emissions by influencing the physiological and ecological dynamics of nitrifying and denitrifying microbial communities in activated sludge systems. For example, Nitrosomonas is a common N2O producing nitrifying bacteria in wastewater treatment plants (WWTPs), and DO conditions can affect the N2O production capacity. Previous studies have reported N2O emission characteristics under adequate DO and C/N conditions in A/O WWTPs. However, in actual operation, owing to economic and managerial factors, some WWTPs have a long-term state of low DO levels in oxic tanks and low influent C/N. Research on N2O emission characteristics in low DO-limited and low C/N ratio WWTPs is limited. This study investigated N2O emissions and the corresponding shifts in microorganisms within an anoxic–oxic (A/O) WWTP over 9-month. Quantitative PCR was used to assess the abundance of ten functional genes related to nitrification and denitrification processes, and high-throughput sequencing of the 16S rRNA gene was employed to determine the composition change of microorganisms. The findings revealed that 1) the average N2O emission factor was 1.07% in the studied WWTP;2) the DO-limited oxic tank primarily contributed to N2O;3) NO2–, TOC, and C/N ratios were key factors for dissolved N2O in the aerobic tank;and 4) Nitrosomonas and Terrimonas exhibited a robust correlation with N2O emissions. This research provides data references for estimating N2O emission factors and developing N2O reduction policies in WWTPs with DO-limited and low C/N ratios. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Wastewater treatment

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Identifying priority areas of Four Major Chinese carps’ species in the Pearl River basin based on the MaxEnt model

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Watershed Ecology and the environment 2023年第1期5卷 18-23页

作者： Shao, Xiaojing Liu, Xing Cai, Jie Cai, Yanzi Cui, Baoshan Research Center for Monitoring and Environmental Sciences Taihu Basin & East China Sea Ecological Environment Supervision and Administration Authority Ministry of Ecology and Environment of the People's Republic of China Shanghai 200125 China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China

The Pearl River basin (PRB) is an important producing area and the gene pool of wild resources of Four Major Chinese carps (FMCC). However human activities and climate changes causes the area shrink of the river network in PRB, the pollution aggregation, the serious habitat destroy of aquatic organisms, and the threat of biological resources and their living environment. Based on the accurate location and distribution data of FMCC from the literature and the field survey report of 2015–2016, this study used the MaxEnt model to predict the hot spot distribution area of FMCC in PRB. The simulation results show that the distribution of FMCC in the PRB gradually increases from the upper reaches to the middle and lower reaches. According to the MaxEnt model, the hot spots of FMCC in the PRB are mainly distributed in the south reaches and the lower reaches of the southeast. The model simulation also demonstrates that the hottest spots for the distribution of FMCC species in the PRB are the Yujiang basin, the Qianjiang basin and the lower reaches of the Xijiang basin. This study can provide the scientific guidance for the protection and the restoration of FMCC species in the PRB. © 2022 The Authors

关键词： Biodiversity MaxEnt model Pearl River basin Prior conservation area

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Real-world emission characteristics of carbonyl compounds from agricultural machines based on a portable emission measurement system

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Journal of environmental Sciences 2023年第2期124卷 846-859页

作者： Wenhan Yu Xianbao Shen BoboWu Lei Kong Kaijie Xuan Cheng Zhao Xinyue Cao Xuewei Hao Xin Li Hanyu Zhang Zhiliang Yao School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business UniversityBeijing 100048China

Emissions of carbonyl compounds from agricultural machines cannot be *** compounds can cause the formation of ozone(O3)and secondary organic aerosols,which can cause photochemical smog to *** this study,20 agricultural machines were tested using portable emission measurement system(PEMS)under real-world tillage *** exhaust gases were sampled using 2,4-dinitrophenylhydrazine cartridges,and 15 carbonyl compounds were analyzed by high-performance liquid *** compound emission factors for agricultural machines were 51.14–3315.62 mg/(kg-fuel),and were 2.58±2.05,0.86±1.07 and 0.29±0.20 g/(kg-fuel)for China 0,China II and China III emission standards,*** compound emission factor for sowing seeds of China 0 agricultural machines was 3.32±1.73 g/(kg-fuel).Formaldehyde,acetaldehyde and acrolein were the dominant carbonyl compounds *** in emission standards and tillage processes impact ozone formation potential(OFP).The mean OFP was 20.15±16.15 g O3/(kg-fuel)for the China 0 emission *** OFP values decreased by 66.9% from China 0 to China II,and 67.4%from China II to China *** mean OFP for sowing seeds of China 0 agricultural machines was 25.92±13.84 g O3/(kg-fuel).Between 1.75 and 24.22 times more ozone was found to be formed during sowing seeds than during other processes for China 0 and China II agricultural *** carbonyl compound emissions from agricultural machines in China was 19.23 Gg in *** results improve our understanding of carbonyl compound emissions from agricultural machines in China.

关键词： Agricultural machines Carbonyl compounds Emission characteristics Tillage process PEMS

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Experimental and numerical investigations of biochar-facilitated Cd^(2+)transport in saturated porous media:role of solution pH and ionic strength

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Biochar 2023年第1期5卷 175-190页

作者： Dan Zhou Xingyue Bao Zhe Chen Rui Liu Mingzheng Huang Yonglian Xia Chao Li Yi Huang State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil&Water Pollution College of Ecology and EnvironmentChengdu University of Technology610059 ChengduChina State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology610059 ChengduChina College of Geosciences Chengdu University of Technology610059 ChengduChina.

The nanoscale biochar(N-BC)generated during the production and weathering of bulk biochar has caused significant concerns for its cotransport with contaminants spreading the *** this study,the cotransport behaviors of N-BC with Cd^(2+)under variable solution chemistry were investigated for the first time,which can pose environmental contamination risks but have received little *** column experiment results showed that increasing ionic strength(IS)or decreasing pH retarded the transport of N-BC but promoted the transport of Cd^(2+)in their individual *** cotransport scenarios,Cd^(2+)facilitated the deposition of N-BC on the quartz sand with increasing IS or decreasing pH by providing additional sorption sites and led to the ripening of N-BC via cation bridging.N-BC retarded the transport of Cd^(2+)under all ***,lower pH and higher IS could facilitate the release of Cd^(2+)from the immobile *** cotransport modeling results demonstrated that the Cd^(2+)adsorption on and desorption from the immobile N-BC controlled the retention and release of Cd^(2+)under variable pH and IS,while the influence of mobile N-BC on Cd^(2+)transport was *** study provided new insight for evaluating the potential contamination-spreading risks and suggested that rational use of biochar with great caution is necessary.

关键词： Nanoscale biochar Cadmium Cotransport Numerical modeling

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Degradation of odorous 2,4,6-trichloroanisole in chlorinated water by UV-LED/chlorination: kinetics and influence factors

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environmental Science and pollution Research 2023年第15期30卷 44325-44336页

作者： Zhang, Yun-Lu Lin, Yi-Li Zhang, Tian-Yang Lu, Yong-Shan Zhou, Xiao-Yang Liu, Zhi Zheng, Zheng-Xiong Xu, Meng-Yuan Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan

2,4,6-Trichloroanisole (2,4,6-TCA) has aroused a special concern for their odor problem and potential threats. In this study, the degradation of 2,4,6-TCA by UV/chlorination with different UV sources was compared, including low-pressure mercury lamp (LPUV, 254 nm) and ultraviolet light-emitting diode (UV-LED, 275 and 285 nm). The maximum removal of 2,4,6-TCA can be achieved by 275-nm UV-LED/chlorination in neutral and alkaline conditions which was 80.0%. The reaction, kinetics, and water matrix parameters on 2,4,6-TCA degradation were also evaluated. During UV-LED (275 nm)/chlorination, 2,4,6-TCA degradation was mainly caused by direct UV photolysis and indirect hydroxyl radical (HO·) oxidation, while reactive chlorine radicals (RCSs) had a negligible contribution. The second-order rate constant between HO· and 2,4,6-TCA was determined as 3.1 × 109 M−1 s−1. Increasing initial chlorine dosage and decreasing 2,4,6-TCA concentration or pH value significantly promoted 2,4,6-TCA degradation during UV/chlorination process. The presence of natural organic matter (NOM) and bicarbonate (HCO3−) can inhibit 2,4,6-TCA degradation, while chloride ion (Cl−) had a negligible effect. The kinetic model for 2,4,6-TCA degradation was established and validated, and the degradation pathways were proposed based on the identified intermediates. Furthermore, UV-LED (275 nm)/chlorination also exhibited a promising effect on 2,4,6-TCA removal in real water, which can be used to control 2,4,6-TCA pollution and odor problems. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Alkalinity

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Air pollutant emissions induced by rural-to-urban migration during China's urbanization(2005-2015)

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environmental Science and Ecotechnology 2022年第2期10卷 45-53页

作者： Guang Shi Xi Lu Hongxia Zhang Haotian Zheng Zhonghua Zhang Shi Chen Jia Xing Shuxiao Wang State Key Joint Laboratory of Environment Simulation and Pollution Control and School of Environment Tsinghua UniversityBeijing100084PR China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084PR China Beijing Laboratory of Environmental Frontier Technologies Tsinghua UniversityBeijing100084PR China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084PR China School of Applied Economics Renmin University of ChinaBeijing100872PR China

As the world's most populous country,China has witnessed rapid urbanization in recent decades,with population migration from rural to urban(RU)regions as the major driving *** to the large gap between rural and urban consumption and investment level,large-scale RU migration impacts air pollutant emissions and creates extra uncertainties for air quality ***,we integrated population migration assessment,an environmentally extended inputeoutput model and structural decomposition analysis to evaluate the NOx,SO2 and primary PM2.5 emissions induced by RU migration during China's urbanization from 2005 to *** results show that RU migration increased air pollutant emissions,while the increases in NOx and SO2 emissions peaked in approximately 2010 at 2.4 Mt and 2.2 Mt,accounting for 9.2%and 8.7%of the national emissions,*** primary PM2.5 emissions induced by RU migration also peaked in approximately 2012 at 0.3 Mt,accounting for 2.8%of the national *** indirect emissions embodied in consumption and investment increased,while household direct emissions *** widening gap between urban and rural investment and consumption exerted a major increasing effect on migration-induced emissions;in contrast,the falling emission intensity contributed the most to the decreasing effect benefitting from end-of-pipe control technology applications as well as improving energy *** peak of air pollutant emissions induced by RU migration indicates that although urbanization currently creates extra environmental pressure in China,it is possible to reconcile urbanization and air quality improvement in the future with updating urbanization and air pollution control policies.

关键词： Urbanization Population migration Air pollutant emission reduction Inputeoutput model Structural decomposition analysis

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Approaching the upper boundary of driver-response relationships:identifying factors using a novel framework integrating quantile regression with interpretable machine learning

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Frontiers of environmental Science & Engineering 2023年第6期17卷 153-163页

作者： Zhongyao Liang Yaoyang Xu Gang Zhao Wentao Lu Zhenghui Fu Shuhang Wang Tyler Wagner National Engineering Laboratory for Lake Pollution Control and Ecological Restoration State Environment Protection Key Laboratory for Lake Pollution ControlChinese Research Academy of Environmental SciencesBeijing 100012China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China College of the Environment&Ecology Xiamen UniversityXiamen 361102China Key Laboratory of Urban Environment and Health Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Department of Global Ecology Carnegie Institution for ScienceStanfordCA 94305USA Institute of Strategic Planning Chinese Academy of Environmental PlanningBeijing 100012China The Center for Beautiful China Chinese Academy of Environmental PlanningBeijing 100012China U.S.Geological Survey Pennsylvania Cooperative Fish and Wildlife Research UnitPennsylvania State UniversityUniversity ParkPA 16802USA

The identification of factors that may be forcing ecological observations to approach the upper boundary provides insight into potential mechanisms affecting driver-response relationships,and can help inform ecosystem management,but has rarely been *** this study,we propose a novel framework integrating quantile regression with interpretable machine *** the first stage of the framework,we estimate the upper boundary of a driver-response relationship using quantile ***,we calculate“potentials”of the response variable depending on the driver,which are defined as vertical distances from the estimated upper boundary of the relationship to observations in the driver-response variable scatter ***,we identify key factors impacting the potential using a machine learning *** illustrate the necessary steps to implement the framework using the total phosphorus(TP)-Chlorophyll a(CHL)relationship in lakes across the continental *** found that the nitrogen to phosphorus ratio(N:P),annual average precipitation,total nitrogen(TN),and summer average air temperature were key factors impacting the potential of CHL depending on *** further revealed important implications of our findings for lake eutrophication *** important role of N:P and TN on the potential highlights the co-limitation of phosphorus and nitrogen and indicates the need for dual nutrient *** wetter and/or warmer climate scenarios can decrease the potential which may reduce the efficacy of lake eutrophication *** novel framework advances the application of quantile regression to identify factors driving observations to approach the upper boundary of driver-response relationships.

关键词： Driver-response Upper boundary of relationship Interpretable machine learning Quantile regression Total phosphorus Chlorophyll a

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Highly stable carbon-coated nZVI composite Fe0@RF-C for efficient degradation of emerging contaminants

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environmental Science and Ecotechnology 2024年第6期22卷 233-244页

作者： Guizhou Xu Lin Sun Yizhou Tu Xiaolei Teng Yumeng Qi Yaoyao Wang Aimin Li Xianchuan Xie Xueyuan Gu State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing210023China Key Laboratory of Poyang Lake Environment and Resource Utilization Engineering Research Center of Watershed Carbon NeutralizationMinistry of EducationSchool of Resource and EnvironmentNanchang UniversityNanchang330031China Nanjing University&Yancheng Academy of Environment Protection Technology and Engineering Nanjing210023China Jiangxi Nanxin Environmental Protection Technology Co.LTD Jiujiang CityJiangxi Province330300China

Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and *** nZVI with carbon can effectively addresses these issues.A simple and scalable production method for carbon-coated nZVI composite is highly *** anti-oxidation and catalytic performance of carbon-coated nZVI composite merit in-depth *** this study,a highly stable carbon-coated core-shell nZVI composite(Fe0@RF-C)was successfully prepared using a simple method combining phenolic resin embedding and carbothermal ***0@RF-C was employed as a heterogeneous persulfate(PS)activator for degrading 2,4-dihydroxybenzophenone(BP-1),an emerging *** to commercial nZVI,Fe0@RF-C exhibited superior PS activation performance and oxidation *** 95%of BP-1 was removed within 10 min in the Fe0@RF-C/PS *** carbon layer promotes the enrichment of BP-1 and accelerates its degradation through singlet oxygen oxidation and direct electron transfer *** study provides a straightforward approach for designing highly stable carbon-coated nZVI composite and elucidates the enhanced catalytic performance mechanism by carbon layers.

关键词： Nanoscale zerovalent iron Carbon-coated nZVI Persulfate BP-1 Enhanced degradation

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Understand the local and regional contributions on air pollution from the view of human health impacts

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Frontiers of environmental Science & Engineering 2021年第5期15卷 133-143页

作者： Yueqi Jiang Jia Xing Shuxiao Wang Xing Chang Shuchang Liu Aijun Shi Baoxian Liu Shovan Kumar Sahu State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084China Beijing Municipal Research Institute of Environment Protection Beijing100037China Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology Beijing Municipal Environmental Monitoring CenterBeijing100048China

The source-receptor matrix of PM_(2.5)concentration from local and regional sources in the Beijing-Tianjin-Hebei(BTH)and surrounding provinces has been created in previous ***,because the spatial distribution of concentration does not necessarily match with that of the population,such concentration-based source-receptor matrix may not fully reflect the importance of pollutant control effectiveness in reducing the PM_(2.5)-related health *** demonstrate that,we study the source-receptor matrix of the PM_(2.5)-related deaths instead,with inclusion of the spatial correlations between the concentrations and the *** advanced source apportionment numerical model combined with the integrated exposure-response functions is used for BTH and surrounding regions in *** observed that the relative contribution to PM_(2.5)-related deaths of local emissions was 0.75%to 20.77%larger than that of PM_(2.5)*** results address the importance of local emissions control for reducing health impacts of PM_(2.5)particularly for local *** of regional transport to PM_(2.5)-related deaths in rural area was 22%larger than that in urban area due to the spatial pattern of regional transport which was more related to the rural *** resulted in an environmental inequality in the sense that people staying in rural area with access to less educational resources are subjected to higher impacts from regional transport as compared with their more resourceful and knowledgeable urban *** unexpected benefit from the multi-regional joint controls is suggested for its effectiveness in reducing the regional transport of PM_(2.5)pollution thus mitigating the associated environmental inequality.

关键词： PM_(2.5) Regional transport Local emissions Health impact environmental inequality

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