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Highly time-resolved aerosol characteristics during springtime in Weizhou Island

Journal of environmental Sciences 2018年第10期72卷 64-74页

作者： Jingying Mao Zhiming Chen Zhaoyu Mo Xiaoyang Yang Hong Li Yonglin Liu Huilin Liu Jiongli Huang Junchao Yang Hongjiao Li scientific research academy of guangxi environmental protection Institute for environmental and Climate research Jinan University Chinese research academy of environmental Sciences

A single particle aerosol mass spectrometer was deployed to measure the changes of single particle species and sizes during March 2015 in Weizhou Island of the Beibu Gulf, guangxi province, South China. In this campaign, a total of 3,100,597 particles were sized, and 25.8%particles with both positive and negative mass spectrum were collected and 24.8%characterized in combination with the ART-2 a neural network algorithm. The distribution of sized particles was mainly in from 520 to 600 nm, and the diameters ranging from 340 to1000 nm accounted for above 90%. Eight types of particles were classified: Elemental Carbon containing(EC), Organic Carbon containing(OC), EC and OC combined containing particles,Na containing particles, K containing particles(K), Levoglucosan containing particles,mineral containing particles, and Heavy Metal containing particles(HM). EC, OC and K were the major containing particles, which accounted for 84.3% in the eight types particles. The relative ratio and size distribution of the three types were EC(48.1%, 620 nm), OC(12.7%,440 nm), and K(23.5%, 600 nm), respectively. The three types of particles were a bit increasing ratios compared with those in clean periods during haze pollution *** with the back-trajectory results from the Hysplit-4 model and local pollution sources revealed that the ambient air quality on the Weizhou Island may be influenced by biomass burning in the Indochina Peninsula(biomass burning in the Indochina Peninsula)from the transportation on higher level atmospheric layer and by mainland of south China located northeast of Weizhou Island on the ground.

关键词： Characteristics Transportation Single particle aerosol mass spectrometer Biomass burning Weizhou Island

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[Determination of 12 halogenated organic pollutants in edible fish by ultra performance liquid chromatography-high resolution mass spectrometry combined with ultrasound-assisted extraction and gel permeation chromatography purification]

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Se pu = Chinese journal of chromatography 2025年第1期43卷 68-77页

作者： Yi-Zhe Zhu Rui-Fen Zheng Zi-Hao Fan Ling Liu Jing-Yao Ye Kai Wang Cai-Ming Tang research Center for Eco-environmental Engineering Dongguan University of Technology Dongguan 523808 China. Guangdong Key Laboratory of environmental Resources Utilization and protection Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China.

Halogenated organic pollutants (HOPs) have attracted considerable attention owing to their persistence, bioaccumulation, and toxicity. The development of methods to detect HOPs in fish is challenging owing to the compositional complexity of fish matrices, which contain high levels of lipids and relatively low concentrations of HOPs. In addition, the lipophilicity of most HOPs renders their extraction difficult. Moreover, the simultaneous determination of multiple HOPs to achieve the high-throughput screening of these analytes is complex. In this study, a reliable and efficient pretreatment method based on ultrasound-assisted extraction, gel permeation chromatography purification, and ultra performance liquid chromatography-high resolution mass spectrometry (UPLC-HRMS) was developed for the determination of 12 HOPs in edible fish. The procedures of sample extraction and purification and LC-HRMS detection parameters were optimized to improve the performance of the method. Fresh fish samples were thoroughly rinsed with water, and non-edible parts, including the skin, bones, and phosphorus, were removed. The fish were weighed, cut into small pieces, and vacuum freeze-dried for 48 h. Subsequently, a freeze grinder was used to grind the dried fish into a fine powder. Exactly 2 g of the fish powder was weighed, fortified with isotope-labeled internal standards of the HOPs, and allowed to stand for 5 min. Methanol-acetonitrile (1∶1, v/v) was then added, followed by vortex mixing and ultrasonication. After centrifugation, the supernatant was transferred to a fresh tube. The extraction process was repeated twice and all extracts were combined. The extract was evaporated under a gentle nitrogen flow and redissolved in a mixture of ethyl acetate-cyclohexane (1∶1, v/v). The sample mixture was cleaned using gel permeation chromatography, and the eluate was collected and concentrated under a nitrogen flow. Sample residuals were reconstituted with water-methanol (1∶1, v/v) prior to

关键词： edible fish gel permeation chromatography (GPC) halogenated organic pollutants (HOPs) ultra performance liquid chromatography-high resolution mass spectrometry (UPLC-HRMS)

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Pollution characteristics of peroxyacetyl nitrate in karst areas in Southwest China

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Atmospheric and Oceanic Science Letters 2024年第2期17卷 27-32页

作者： Songjun Guo Xu Wei Hongjiao Li Wen Qin Yijun Mu Jiongli Huang Chuan Nong Junchao Yang Dabiao Zhang Hua Lin Jingying Mao Zhaoyu Mo College of Resources Environment and MaterialsGuangxi UniversityNanningGuangxiChina scientific research academy of guangxi environmental protection NanningGuangxiChina

桂林是世界著名的地处喀斯特地区的旅游胜地,其光化学污染问题日益严重,过氧乙酰硝酸酯(PAN)被认为是光化学污染的可靠指标,也是本研究的重点.本研究于2021年10月首次观测了桂林的PAN的浓度为0.087-2.559ppb,同时探讨了PAN典型高值过程... 详细信息

桂林是世界著名的地处喀斯特地区的旅游胜地,其光化学污染问题日益严重,过氧乙酰硝酸酯(PAN)被认为是光化学污染的可靠指标,也是本研究的重点.本研究于2021年10月首次观测了桂林的PAN的浓度为0.087-2.559ppb,同时探讨了PAN典型高值过程的成因.此次污染主要来源于东北方向污染气团的水平和高空输送,同时,高温,强辐射和低湿度等气象条件也促进了本地PAN的形成.本研究同时估算了桂林市的O3背景浓度为20.347ppb.这项研究为城市的光化学污染控制工作提供了理论基础。

关键词：过氧乙酰硝酸酯光化学反应传输影响气象因素

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Influence of carbon sources on nutrient removal in A2/O-MBRs： Availability assessment of internal carbon source

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Journal of environmental Sciences 2016年第10期28卷 59-68页

作者： Rongle Xu Yaobo Fan Yuansong Wei Yawei Wang Nan Luo Min Yang Xing Yuan Rong Yu scientific research academy of guangxi environmental protection Jiaoyu Road 5 QingXiu Distr. Nanning 530022 China. research Center for Eco-environmental Sciences Chinese Academy of Sciences Shuangqing Road 18 Haidian Distr. Beijing 100085 China

Both intemal carbon source and some external carbon sources were used to improve the nutrient removal in Anaerobic-Anoxic-Oxic-Membrane Bioreactor （A2/O-MBRs）, and their technical and cost analysis was investigated. The experimental results showed that the nutrient removals were improved by all the carbon source additions. The total nitrogen and phosphorus removal efficiency were higher in the experiments with external carbon source additions than that with internal carbon source addition. It was found that pathways of nitrogen and phosphorus transform were different dependent on different carbon source additions by the mass balance analysis. With extemal carbon source addition, the simultaneous nitrification and denitrification occurred in aerobic zone, and the P-uptake in aerobic phase was evident. Therefore, with addition of C-MHP （internal carbon source produced from sludge pretreatment by microwave-H2O2 process）, the denitrification and phosphorus-uptake in anoxic zone was notable. Cost analysis showed that the unit nitrogen removal costs were 57.13 CNY/kg N of C-acetate addition and 54.48 CNY/kgN of C-MHP addition, respectively. The results indicated that the C-MHP has a good technical and economic feasibility to substitute extemal carbon sources partially for nutrient removal.

关键词： Carbon sourceNutrient removalMass balanceCost analysis

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Electrochemical conversion of methane to bridge the gap in the artificial carbon cycle

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Journal of Energy Chemistry 2025年第1期100卷 286-308页

作者： Yuhao Peng Yuefeng Song Ihar Razanau Juanxiu Xiao Wei Xiao Di Hu Guoxiong Wang College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) Dalian Institute of Chemical Physics Chinese Academy of Sciences Laboratory of Physical-Chemical Technologies SSPA Scientific and Practical Materials Research Centre of NAS of Belarus State Key Laboratory of Marine Resources Utilization in South China Sea Collaborative Innovation Center of Marine Science and Technology School of Marine Science and Engineering Hainan University Department of Chemical and environmental Engineering University of Nottingham Ningbo China

Methane, an abundant one-carbon（C1） resource, is extensively used in the industrial production of vital fuels and value-added chemicals. However, current industrial methane conversion technologies are energy-and carbon-intensive, mainly due to the high activation energy required to break the inert C–H bond, low selectivity, and problematic side reactions, including CO2emissions and coke deposition. Electrochemical conversion of methane（ECM） using intermittent renewable energy offers an attractive solution, due to its modular reactor design and operational flexibility across a broad spectrum of temperatures and pressures. This review emphasizes conversion pathways of methane in various reaction systems, highlighting the significance and advantages of ECM in facilitating a sustainable artificial carbon cycle. This work provides a comprehensive overview of conventional methane activation mechanisms and delineates the complete pathways of methane conversion in electrolysis contexts. Based on surface/interface chemistry, this work systematically analyzes proposed reaction pathways and corresponding strategies to enhance ECM efficiency towards various target products, including syngas, hydrocarbons, oxygenates, and advanced carbon materials. The discussion also encompasses opportunities and challenges for the ECM process, including insights into ECM pathways, rational electrocatalyst design, establishment of benchmarking protocols, electrolyte engineering, enhancement of CH4conversion rates, and minimization of CO2emission.

关键词： Activation energy

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Boosting Photocatalytic Performance of Cu-Mn Co-doped CeO_(2) Nanoparticles for Tetracycline Degradation

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 42-48页

作者： XU Rongqi MI Jianxin WANG Shulin XU Man ZHU Li BAI Lei TANG Dandan LEI Yu Engineering research Center of environmental Materials and Membrane Technology of Hubei Province School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Shaanxi Coal Chemical Industry Technology research Institute Co. Ltd.Xi’an 710100China

Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading *** and TEM results showed that Cu and Mn were successfully co-doped into CeO_(2) without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer ***,the optimized Cu3Mn2CeO_(2) nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.

关键词： photocatalyst co-doped charge separation water treatment

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Characterization of precipitation in the background of atmospheric pollutants reduction in Guilin: Temporal variation and source apportionment

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Journal of environmental Sciences 2020年第12期32卷 1-13页

作者： Ling Li Hong Li Liang Peng Yongshan Li Yi Zhou Fahe Chai Zhaoyu Mo Zhiming Chen Jingying Mao Wenxing Wang State Key Laboratory of environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China College of Chemistry and Chemical Engineering Southwest Petroleum UniversityChengdu 610500China Guilin environmental Monitoring Center Station Guilin 541002China scientific research academy of guangxi environmental protection Nanning 530022China Institute of environmental and Climate research Jinan UniversityGuangzhou 511443China environmental research Institute Shandong UniversityQingdao 266237China

Rainfall samples were collected from three observation sites in Guilin from 2013 to 2017, and the chemical composition characteristics of precipitation and the contribution made by different ion sources were analyzed when atmospheric pollutants levels were reduced. The results showed that acid gas emissions and atmospheric pollutant concentrations continued to decline during the study period. However, the change in the volume-weighted mean p H at the three sites suggested that acid rain pollution was not alleviated and began to deteriorate after 2015. The continuing downward trend for alkaline neutralizing ions(Ca^(2+), NH_4^+) in precipitation indicated that the reduction in alkaline neutralizing substances in the atmosphere was an important factor that led to the deterioration in acid rain across Guilin. The principal component analysis and spearman correlation analysis indicated five sources of ions in precipitation. Quantitative assessment of these five sources indicated that fossil fuel combustion contributed the most ions concentration in precipitation at the three sites, followed by agriculture, terrestrial(crustal) sources, marine sources, and biomass burning. Long-distance airflow might affect the acidity, the electrical conductivity(EC), and ion concentrations in precipitation across Guilin. The airflow trajectory from the west and southeast directions corresponded to higher acidity and ion concentrations. According to the current air pollution control strategy planned by Guilin, reducing atmospheric coarse particles and NH_3 at the same time may potentially lead to further deteriorations in acid rain contents. Therefore, Guilin needs to develop more reasonable pollution prevention measures that synergistically control atmospheric pollutants and acid rain pollution.

关键词： Precipitation chemistry Characterization Source contributions Synergistic control Guilin

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Functional and numerical responses of Cyrtorhinus lividipennis to eggs of Nilaparvata lugens are not affected by genetically modified herbicide-tolerant rice

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Journal of Integrative Agriculture 2015年第10期14卷 2019-2026页

作者： JIANG Xian-bin HUANG Qian LING Yan CHEN Yu-chong XIAO Guo-ying HUANG Suo-sheng WU Bi-qiu HUANG Feng-kuan CAI Jian-he LONG Li-ping guangxi Key Laboratory of Rice Genetics and Breeding Rice Research Institute Guangxi Academy of Agricultural Sciences Plant protection research Institute Guangxi Academy of Agricultural Sciences guangxi academy of Agricultural Sciences Institute of Subtropical Agriculture Chinese Academy of Sciences

To safely and sustainably utilize genetic breeding techniques for crop production, greater understanding of the potential effects of genetically modified herbicide-tolerant（GMHT） crops on the ecological functions of predators is required. In the laboratory, we examined the functional and numerical responses of Cyrtorhinus lividipennis Reuter to eggs of brown planthopper（BPH）, Nilaparvata lugens（St？l）, which were reared on GMHT rice Bar68-1; the untransformed parental cultivar, D68; or a BPH-susceptive rice variety, Taichung Native 1. All stages of nymphs and female adult of C. lividipennis, either on GMHT rice or control plants, exhibited typical type II functional responses when fed on BPH eggs; the attacking rate and handling time of C. lividipennis on GMHT rice Bar68-1 was not significantly different from that on D68. The numerical responses of C. lividipennis on GMHT rice or controls fit Beddington＇s model; there were no significant differences in the parameters of numerical responses between GMHT rice Bar68-1 and D68. The results indicated that the functional and numerical responses of C. lividipennis to BPH eggs are not affected by GMHT rice Bar68-1.

关键词： transgenic rice green mirid bug brown planthopper natural enemy non-target organisms predator herbicide resistant safety assessm

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Eutrophication development and its key regulating factors in a water-supply reservoir in North China

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Journal of environmental Sciences 2013年第5期25卷 962-970页

作者： Liping Wang Lusan Liu Binghui Zheng State environmental protection Key Laboratory of Estuary and Coastal Environment Chinese Research Academy of Environmental Sciences

Yanghe Reservoir is an important source of drinking water for Qinhuangdao City,North China;however,in recent decades this water source has been eutrophic with recurrent summer cyanobacterial *** trophic grade of the system in summer was mesotrophiceutrophic in 1990 and became hypertrophic in *** nutrient availability is extremely high during the entire year,and the water temperature should be the primary driver of the summer *** May-October of 2010 and 2011,abrupt variations were observed in the Secchi depth（SD） and chlorophyll a（Chl-a）,and both the correlated analysis of Chl-a-SD and trophic status indices（TSI） deviation（TSI Chl-a-TSI SD） showed that algal cell density dominated light *** the algal bloom outbreak,the microcystin concentration was found to vary between 0.35-2.12 μg/L in 2010 and 0.11-1.86 μg/L in *** maximum microcystin content was more than two times the safety limit required for drinking *** discharges were most concentrated in the summer,with periods of lower residence time and the largest water level fluctuation over the entire *** a high availability of nutrients promoted a high Chl-a concentration in the whole system,it appeared that the instability caused by the decrease in residence time could not produce effective changes in the cyanobacterial *** results indicated that nutrient enrichment in the aquatic systems of Yanghe Reservoir is the most serious problem and that the status would not been modified effectively by increasing hydrological fluctuations（e.g.,decreasing the residence time）.Therefore,decreasing the nutrient concentrations is the only route to improve the water quality of this reservoir.

关键词： eutrophication trophic state cyanobacterial bloom limiting factors water-supply reservoir

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Synthesis of carbon-coated magnetic nanocomposite(Fe_3O_4@C) and its application for sulfonamide antibiotics removal from water

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Journal of environmental Sciences 2014年第5期26卷 962-969页

作者： Xiaolei Bao Zhimin Qiang Jih-Hsing Chang Weiwei Ben Jiuhui Qu State Key Laboratory of environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences State environmental protection Engineering Center for Pharmacy Wastewater Pollution Control Hebei Provincial Environmental Scientific Research Department of environmental Engineering and Management Chaoyang University of Technology

The occurrence of antibiotics in the environment has recently raised serious concerns regarding their potential threat to human health and aquatic ecosystem. A new magnetic nanocomposite, Fe304@C （Fe304 coated with carbon）, was synthesized, characterized, and then applied to remove five commonly-used sulfonamides （SAs） from water. Due to its combinational merits of the outer functionalized carbon shell and the inner magnetite core, Fe3O4@C exhibited a high adsorption affinity for selected SAs and a fast magnetic separability. The adsorption kinetics of SAs on Fe304 @ C could be expressed by the pseudo second-order model. The adsorption isotherms were fitted well with the Dual-mode model, revealing that the adsorption process consisted of an initial partitioning stage and a subsequent hole-filling stage. Solution pH exerted a strong impact on the adsorption process with the maximum removal efficiencies （74% to 96%） obtained at pH 4.8 for all selected SAs. Electrostatic force and hydrogen bonding were two major driving forces for adsorption, and electron-donor-acceptor interactions may also make a certain contribution. Because the synthesized Fe304@C showed comprehensive advantages of high adsorptivity, fast magnetic separability, and prominent reusability, it has potential applications in water treatment.

关键词： magnetic nanocomposite carbon shell sulfonamides adsorption water

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