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Effects of Drought-Rewetting Process and Salinity Variations on Dissolved Organic Matter Transformation and its Bacterial Mechanisms in Lacustrine Pore Water

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SSRN 2022年

作者： Zhu, Xiang Xie, Lei Ma, Yushen Wang, Longmian Pang, Qingqing Peng, Fuquan Xu, Zhipeng Xu, Bin He, Fei Ni, Lixiao Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China College of Environment Hohai University Nanjing210098 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science and Technology Nanjing210044 China

Climate change and anthropogenic activities cause salinity fluctuations and frequent drought-rewetting process in lacustrine littoral zones. However, the synergistic effects of these processes on the quality, quantity, and bacterial mechanisms of dissolved organic matter (DOM) in pore water are not well understood. An experiment was conducted to analyze the influence of drought-rewetting processes and salinity variations on DOM characteristics and the resident bacterial communities. The results showed that higher salinity (6,000 mg/L) resulted in a higher humification index (HIX), lower spectral slope ratio (S R ), E2/E3, and biological index (BIX) of pore water, and an accelerated degradation of protein-like substances. The dominant DOM fluorescent components were protein-like substances before the drought-rewetting process, which changed to humic-like substances after the drought-rewetting process. The synergistic effects of higher salinity and drought-rewetting process were to retain more humified, more aromatic, and less bioavailable DOM in the pore water, to maintain lower concentrations of pore water DOM, and to increase the dominance of autotrophic bacteria, such as the Thiobacillus belong to Hydrogenophilaceae. Before the drought-rewetting process Hydrogenophilaceae, Oxalobacteraceae, and Flavobacteriaceae participated in the DOM transformation, while after the drought-rewetting process, the Hydrogenophilaceae, Desulfobacteraceae, Anaerolineacea, Planococcaceae, and Clostridiaceae were associated with the DOM components. Hydrogenophilaceae, Desulfobacteraceae, and Anaerolineacea were resistant to increased salinity, but other functional bacteria were negatively correlated with salinity. The drought-rewetting process greatly reduced the compactness of interrelationships among the bacteria and altered interactions between Hydrogenophilaceae and other bacteria. Continuous recharge of water with appropriate salinity and flow instead of intermittent recharge to b

关键词： Drought

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Co2 Methanation Over the Ni-Based Catalysts Supported on Nano-Ceo2 with Varied Morphologies

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SSRN 2022年

作者： Xu, Leilei Bian, Yufang Xu, Chunying Wen, Xueying Cui, Yan Wang, Shuhan Wu, Cai-E Qiu, Jian Cheng, Ge Chen, Mindong Collaborative Innovation Center of the Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing210044 China College of Light Industry and Food Engineering Nanjing Forestry University Nanjing210037 China Jiangsu ShuangLiang Environmental Technology Co. Ltd. Jiangyin214400 China

A series of CeO2 supports with particular morphologies (nanorods, nanocubes, nanooctas, and nanoparticles) were successfully fabricated by controlling the parameters of the hydrothermal method. The obtained nano-CeO2 materials were utilized as the supports of the Ni-based CO2 methanation catalysts prepared by the incipient impregnation method. It was found that the catalyst supported on the CeO2 nanoparticles (5Ni/NPs) exhibited much higher catalytic activity and better stability than those of catalysts with other morphological CeO2 supports. Thus, the catalytic performance of Ni/CeO2 catalysts could be facilely tuned and optimized by precisely designing the morphology of the CeO2 support. The XPS, CO2-TPD, and H2-TPR characterizing techniques showed that Ni-based catalysts supported on nano-CeO2 with varied morphologies displayed different catalytic performances. It was supposed that the typical merits, such as the abundant oxygen vacancy, medium basic sites, moderate metal-support interaction, excellent reduction ability, etc., were considered as the main origins for the enhancement of the low-temperature catalytic activities. Furthermore, the kinetic study revealed that the Ni-based catalysts supported on the nano-CeO2 with varied morphologies performed the different apparent activation energies toward CO2 methanation. The specific reaction intermediates and possible reaction pathways were carefully investigated though the in-situ DRIFTS and online TPSR techniques. Overall, this work would provide new perspectives that the roles of the morphology effect of the support ought to be emphatically considered when designing new catalysts. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Bearing Faults Diagnosis for Axle-Box of High Speed Train Based on Cepstrum Pre-Whitening and Envelope Demodulation

Bearing Faults Diagnosis for Axle-Box of High Speed Train Ba...

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International Conference on Sensing, Diagnostics, Prognostics, and control (SDPC)

作者： Zhongdong Jiang Weigang Hu Hongzheng Fang Huanzhen Fan Beijing Aerospace Measure & Control Corp (AMC). Ltd. National and Local Joint Engineering Research Centre of Equipment Life Cycle Condition Monitoring and Health Management Technology and Application Beijing China Beijing Aerospace Measure & Control Corp (AMC). Ltd. Beijing Key Laboratory of High-speed Transport Intelligent Diagnostic and Health Management Beijing China

ISBN: (数字)9781728170503

ISBN: (纸本)9781728170510

As the key load transfer component of high-speed train, axle-box bearing plays important role of load bearing, wear reducing and resistance. At present, it is a very effective method to monitor the bearing state by monitoring the vibration signal of the train axle-box online and adopting relevant methods. In this paper, a method of bearing fault diagnosis based on the combination of pre-whitening of cepstrum editing procedure (CEP) and envelope demodulation is proposed. The cepstrum pre-whitening can eliminate the periodic vibration component of the bearing vibration signal, extract the non-stationary impact vibration response of the bearing vibration signal containing noise, and analyze the envelope of the bearing vibration signal after pre-whitening to enhance the fault characteristic component in the case of the unknown optimal resonant frequency band. Through the data analysis and verification of the actual vehicle test-bed, this method can effectively diagnose the axle-box bearing fault, especially for the bearing inner ring and outer ring fault diagnosis.

关键词： Vibrations Fault diagnosis Cepstrum Acceleration monitoring Frequency control Demodulation

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One-Pot Synthesis of Hexagonal Mesoporous Silica Confined Ni Based Catalysts with Advanced Co2 Methanation Performance

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SSRN 2022年

作者： Xu, Leilei Xu, Chunying Chen, Bin Bian, Yufang Wen, Xueying Cheng, Ge Wu, Cai-E Qiu, Jian Chen, Mindong Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing210044 China College of Light Industry and Food Engineering Nanjing Forestry University Nanjing210037 China Jiangsu ShuangLiang Environmental Technology Co. Ltd. Jiangyin214400 China

In this work, a series of hexagonal mesoporous silica (HMS) confined Ni based CO2 methanation catalysts were successfully synthesized by the facile one-pot strategy. In the Ni-HMS system, the metallic Ni active sites were embedded in the framework of HMS support. Hence, the metallic Ni active sites were highly dispersed and stably confined by the HMS framework. The kinetic study demonstrated that the Ni-HMS catalysts behaved much lower apparent activation energy than the 15Ni/HMS and 15Ni/SiO2 catalysts, accounting for their enhanced low-temperature activities. Meanwhile, the online TPSR and in-situ DRIFTS of the CO2 methanation were employed to study the reaction intermediates over these catalysts. The CHOO-, CH x O-, and CO x were considered as the reaction intermediates over the Ni-HMS catalysts and the possible reaction pathways were also proposed. In conclusion, the Ni-HMS catalysts were considered as a series of efficient and stable catalyst candidates for CO2 methanation. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Development of efficient and economic Bi2O3/BN/Co3O4 composite photocatalyst: Degradation mechanism, pathway and toxicity study of norfloxacin

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Chemosphere 2024年 352卷 141481页

作者： Wang, Ning Wang, Wei Qi, Dan Kang, Guodong Wang, Bo Zhang, Houhu Ruan, Jiuli Lei, Rongrong Zhang, Zhenhua Zhang, Shenghu Zhou, Hao Nanjing Institute of Environmental Sciences Ministry of Ecology and Environment Nanjing210042 China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology 219 Ningliu Road Nanjing210044 China State Environmental Protection Key Laboratory of Ecological Industry Chinese Research Academy of Environmental Sciences Beijing100012 China Xinjiang Tianxi Environmental Protection Technology Co. LTD Wulumuqi830026 China

The production of cheap, efficient, and stable photocatalysts for degrading antibiotic contaminants remains challenging. Herein, Bi2O3/boron nitride (BN)/Co3O4 ternary composites were synthesized using the impregnation method. The morphological characteristics, structural features, and photochemical properties of the prepared photocatalysts were investigated via X-ray diffraction, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy, and ultraviolet–visible (Vis) diffuse reflectance spectrum techniques. BN was used as a charge transfer bridge in the ternary composites, which afforded a heterojunction between the two semiconductors. The formation of the heterojunction substantially enhanced the charge separation and improved the photocatalyst performance. The degradation activity of the Bi2O3/BN/Co3O4 ternary composites against norfloxacin (NOR) under Vis light irradiation was investigated. The degradation rate of NOR using 5-wt% Bi2O3/BN/Co3O4 reached 98% in 180 min, indicating excellent photocatalytic performance. The ternary composites also exhibited high photostability with a degradation efficiency of 88.4% after five cycles. Hydroxyl radicals (•OH), superoxide radicals (•O2−), and holes (h+) played a synergistic role in the photocatalytic reaction, where h+ and •O2− were more important than •OH. Consequently, seven intermediates and major photocatalytic degradation pathways were identified. Toxicity experiments showed that the toxicity of the degradation solution to Chlorella pyrenoidosa decreased. Finally, the ecotoxicity of NOR and its intermediates were analyzed using the Toxicity Estimation Software Tool, with most intermediates exhibiting low toxicity. © 2024 Elsevier Ltd

关键词： Toxicity

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The 2022 report of synergetic roadmap on carbon neutrality and clean air for China:Accelerating transition in key sectors

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Environmental Science and Ecotechnology 2024年第3期19卷 4-18页

作者： Yu Lei Zhicong Yin Xi Lu Qiang Zhang Jicheng Gong Bofeng Cai Cilan Cai Qimin Chai Huopo Chen Renjie Chen Shi Chen Wenhui Chen Jing Cheng Xiyuan Chi Hancheng Dai Xiangzhao Feng Guannan Geng Jianlin Hu Shan Hu Cunrui Huang Tiantian Li Wei Li Xiaomei Li Jun Liu Xin Liu Zhu Liu Jinghui Ma Yue Qin Dan Tong Xuhui Wang Xuying Wang Rui Wu Qingyang Xiao Yang Xie Xiaolong Xu Tao Xue Haipeng Yu Da Zhang Ning Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Xin Zhang Zengkai Zhang Bo Zheng Yixuan Zheng Jian Zhou Tong Zhu Jinnan Wang Kebin He Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100041China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100041China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China School of Public Health Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of HealthFudan UniversityShanghai200032China School of Economics and Management Beijing University of Chemical TechnologyBeijing100029China Department of Earth System Science University of CaliforniaIrvineCA92697USA National Meteorological Center China Meteorological AdministrationBeijing100081China College of Environmental Sciences and Engineering Peking UniversityBeijing100871China Policy Research Center for Environment and Economy Ministry of Ecology and Environment of the People's Republic of ChinaBeijing100029China Jiangsu Key Laboratory of Atmospheric Environment Monitoring

China is now confronting the intertwined challenges of air pollution and climate *** the high synergies between air pollution abatement and climate change mitigation,the Chinese government is actively promoting synergetic control of these two *** Synergetic Roadmap project was launched in 2021 to track and analyze the progress of synergetic control in China by developing and monitoring key *** Synergetic Roadmap 2022 report is the first annual update,featuring 20 indicators across five aspects:synergetic governance system and practices,progress in structural transition,air pollution and associated weather-climate interactions,sources,sinks,and mitigation pathway of atmospheric composition,and health impacts and benefits of coordinated *** to the comprehensive review presented in the 2021 report,the Synergetic Roadmap 2022 report places particular emphasis on progress in 2021 with highlights on actions in key sectors and the relevant *** milestones include the proportion of non-fossil power generation capacity surpassing coal-fired capacity for the first time,a decline in the production of crude steel and cement after years of growth,and the surging penetration of electric ***,in 2022,China issued the first national policy that synergizes abatements of pollution and carbon emissions,marking a new era for China's pollution-carbon *** changes highlight China's efforts to reshape its energy,economic,and transportation structures to meet the demand for synergetic control and sustainable ***,the country has witnessed a slowdown in carbon emission growth,improved air quality,and increased health benefits in recent years.

关键词： Synergetic roadmap Carbon neutrality Clean air

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Large potential of strengthening the land carbon sink in China through anthropogenic interventions

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Science Bulletin 2024年第16期69卷 2622-2631页

作者： Xu Yue Hao Zhou Yang Cao Hong Liao Xiaofei Lu Zhen Yu Wenping Yuan Zhu Liu Yadong Lei Stephen Sitch Jürgen Knauer Huijun Wang 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&Technology(NUIST)Nanjing 210044China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Jiangsu Nanjing Environmental Monitoring Center Nanjing 210013China Key Laboratory of Agrometeorology of Jiangsu Province Institute of EcologySchool of Applied MeteorologyNUISTNanjing 210044China Institute of Carbon Neutrality Sino-French Institute for Earth System ScienceCollege of Urban and Environmental SciencesPeking UniversityBeijing 100871China Department of Earth System Science Tsinghua UniversityBeijing 100084China State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China College of Life and Environmental Sciences University of ExeterExeter EX44RJUK Hawkesbury Institute for the Environment Western Sydney UniversityPenrith 2751Australia Key Laboratory of Meteorological Disaster Ministry of EducationJoint International Research Laboratory of Climate and Environment ChangeCollaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNUISTNanjing 210044China

The terrestrial ecosystem in China mitigates 21%-45%of the national contemporary fossil fuel CO_(2) emissions every *** and strengthening the land carbon sink is essential for reaching China’s target of carbon ***,this sink is subject to large uncertainties due to the joint impacts of climate change,air pollution,and human ***,we explore the potential of strengthening land carbon sink in China through anthropogenic interventions,including forestation,ozone reduction,and litter removal,taking advantage of a well-validated dynamic vegetation model and meteorological forcings from 16 climate *** anthropogenic interventions,considering Shared Socioeconomic Pathways(SSP)scenarios,the land sink is projected to be 0.26-0.56 Pg C a^(-1) at 2060,to which climate change contributes 0.06-0.13 Pg C a^(-1) and CO_(2) fertilization contributes 0.08-0.44 Pg C a^(-1) with the stronger effects for higher emission *** anthropogenic interventions,under a close-to-neutral emission scenario(SSP1-2.6),the land sink becomes 0.47-0.57 Pg C a^(-1) at 2060,including the contributions of 0.12 Pg C a^(-1) by conservative forestation,0.07 Pg C a^(-1) by ozone pollution control,and 0.06-0.16 Pg C a^(-1) by 20%litter removal over planted *** sink can mitigate 90%-110% of the residue anthropogenic carbon emissions in 2060,providing a solid foundation for the carbon neutrality in China.

关键词： Carbon sink Forestation Ozone Litter removal

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Low-Level Alternative Halogenated Flame Retardants (Ahfrs) in Indoor Dust from Adelaide, South Australia Decades since National Legislative control on Polybrominated Diphenyl Ethers (Pbdes)

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SSRN 2021年

作者： Yang, Yan Yang, Liu Chen, Haojia Tan, Hongli Yang, Jing Sun, Fengjiang Sun, Jiachen Gong, Xue Tao, Lin Huang, Yichao School of Environmental Science and Engineering Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou 510006 China Synergy Innovation Institute of GDUT Shantou515041 China Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Shantou515041 China School of Environment Guangdong Key Laboratory of Environmental Pollution and Health Jinan University Guangzhou 510632 China State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring China National Environmental Monitoring Center Beijing100012 China College of Marine Life Science Ocean University of China Qingdao266000 China School of Agriculture Food & Wine The University of Adelaide AdelaideSA5000 Australia Department of Toxicology School of Public Health Anhui Medical University Hefei230032 China

Since commercial polybrominated diphenyl ethers (PBDEs) have been globally banned or restricted in 2000s, alternative halogenated flame retardants (AHFRs) appear increasingly dominant over PBDEs in many countries/regions. In this study, low levels of AHFRs were unexpectedly observed in the indoor dust from Adelaide, South Australia. Anti-dechlorane plus (anti-DP) was the most frequently detected AHFR with median concentration of 1.28 ng/g, while other AFHRs were less detected (detection frequency © 2021, The Authors. All rights reserved.

关键词： Organic pollutants

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Co2 Methanation Over the Ni-Based Catalysts Supported on the Hollow Zsm-5 Zeolites: Effects of the Hollow Structure and Alkaline Treatment

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SSRN 2022年

作者： Cui, Yan Chen, Bin Xu, Leilei Chen, Mindong Wu, Cai-E Qiu, Jian Cheng, Ge Wang, Ning Xu, Jingxin Hu, Xun Collaborative Innovation Centre of the Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science & Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing210044 China College of Light Industry and Food Engineering Nanjing Forestry University Nanjing210037 China Jiangsu ShuangLiang Environmental Technology Co. Ltd. Jiangyin214400 China Faculty of Environment and Life Beijing University of Technology Beijing100124 China State Environmental Protection Key Laboratory of Atmospheric Physical Modeling and Pollution Control China Energy Science and Technology Research Institute Co. Ltd. Nanjing210023 China School of Material Science and Engineering University of Jinan Jinan250022 China

Hollow ZSM-5 zeolites prepared using different alkaline solutions were employed as Ni catalyst supports for the methanation of CO 2 . The catalysts were thoroughly characterized, and in-situ DRIFTS were used to study the CO 2 methanation intermediates. Using the hollow Ni-based catalysts led to enhanced CO 2 conversion as well as CH 4 selectivity compared to traditional Ni/ZSM-5, which was mainly due to the strong basicity of the hollow supports as well as the presence of oxygen vacancies. Meanwhile, the 15Ni/H-ZSM-5-T catalyst prepared with TPAOH solution had higher catalytic performance than 15Ni/H-ZSM-5-NT and 15Ni/H-ZSM-5-N. The introduction of the hollow zeolite morphology led to enhanced diffusion behavior in the catalyst, which inhibited catalyst deactivation. Therefore, the hollow structure and alkaline treatment of the support was an important consideration for the design and preparation of high-performance Ni-based catalysts for CO 2 methanation. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Temporal Variations of Major Inorganic Nutrient Concentration and Their Influences on Harmful Algal Blooms in the Bohai Sea Over the Past Thirteen Years

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SSRN 2023年

作者： Xiao, Rushui Zhang, Yuming Zhao, Zihan Guo, Junting Zhang, Shufang Lv, Xianqing Shi, Honghua Physical Oceanography Laboratory Ocean University of China Qingdao China State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control Ministry of Ecology and Environment of the People’s Republic of China Guangzhou China National Marine Environment Monitoring Center Dalian116023 China First Institute of Oceanography Ministry of Natural Resources Qingdao266061 China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology Qingdao266237 China

The Bohai Sea (BHS) has been subjected to harmful algal blooms (HABs). In this study, we compiled and analyzed datasets of HABs and related environmental parameters in BHS from 2006 to 2018 including dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP). However, quarterly monitoring cannot give direct in-situ observations when HABs happened. Therefore, we reconstructed spatially discrete seasonal observations to a spatial resolution of 0.25°*0.25° continuous monthly data from August 2006 to October 2019 using Chebyshev Polynomial Fitting (CPF) and seasonal decomposition methods. It was concluded that a coherent growing trend of the DIN and DIN/DIP ratio transitioned to a lowering trend from 2013, whereas the DIP concentration exhibits a consistent falling trend from 2012 to 2019. the occurrence of HABs was successfully controlled by the reduction of DIN and DIP, but the reduction may promote the occurrence or intensity of HABs events in some particular algal species. © 2023, The Authors. All rights reserved.

关键词： Dissolution

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