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Methylmercury and sulfate-reducing bacteria in mangrove sediments from Jiulong River Estuary,China

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Journal of Environmental Sciences 2011年第1期23卷 14-21页

作者： Hao Wu Zhenhua Ding Yang Liu Jinling Liu Haiyu Yan Jiayong Pan Liuqiang Li Huina Lin Guanghui Lin haoliang lu Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems and School of Life Sciences Xiamen University Xiamen 361005 China State Key Laboratory of Environmental Geochemistry Institute of Geochemistr) Chinese Aeademy of Sciences Guiyang 550002 China Key Laboratory of Nuclear Resources and Environment East China Institute of Technology Minist~ of Education Nanchang 330013 China

Estuaries are important sites for mercury （Hg） methylation, with sulfate-reducing bacteria （SRB） thought to be the main Hg methylators. Distributions of total mercury （THg） and methylmercury （MeHg） in mangrove sediment and sediment core from Jiulong River Estuary Provincial Mangrove Reserve, China were determined and the possible mechanisms of Hg methylation and their controlling factors in mangrove sediments were investigated. Microbiological and geochemical parameters were also determined. Results showed that SRB constitute a small fraction of total bacteria （TB） in both surface sediments and the profile of sediments. The content of THg, MeHg, TB, and SRB were （350 ± 150） ng/g, （0.47 ± 0.11） ng/g, （1.4× 10^011 ± 4.1 × 10^9） cfu/g dry weight （dw）, and （5.0× 10^6 d： 2.7 × 10^6） cfu/g dw in surficial sediments, respectively, and （240 ± 24） ng/g, （0.30 ± 0.15） ng/g, （1.9 × 10^11 ± 4.2 × 10^9） cfu/g dw, and （1.3 × 10^6 ± 2.0 × 10^6） cfu/g dw in sediment core, respectively. Results showed that THg, MeHg, TB, MeHg/THg, salinity and total sulfur （TS） increased with depth, but total organic matter （TOM）, SRB, and pH decreased with depth. Concentrations of MeHg in sediments showed significant positive correlation with THg, salinity, TS, and MeHg/THg, and significant negative correlation with SRB, TOM, and pH. It was concluded that other microbes, rather than SRB, may also act as main Hg methylators in mangrove sediments.

关键词： mercury methylmercury sediment mangrove sulfate-reducing bacteria

Mapping the scientific knowledge of glomalin-related soil protein with implications for carbon sequestration

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Ecosystem Health and Sustainability 2022年第1期8卷 324-341页

作者： Shanle Liu Qizhi Wang lu Qian Binghuang Zhang Xiangwen Chen Hualong Hong Shengjie Wu Jingchun Liu Chongling Yan haoliang lu Ministry of Education Key Laboratory of the Coastal and Wetland EcosystemsXiamen UniversityFujianChina College of the Environment and Ecology Fujian Key Laboratory of Coastal Pollution Prevention and ControlXiamen UniversityFujianChina

Arbuscular mycorrhizal fungi(AMF)derived refractory organic matter,mainly in glomalinrelated soil protein(GRSP),stores globally significant amounts of carbon,attracting wide attention in response to climatic ***,there is no synthesis review has been done so far toreveal global research progresses on GRSP,especially its ecological role forclimate ***,we conducted a bibliometric analysis of the papers on GRSP research from 1998 to 2021,based on the Web of Science(WOS)Core *** collected a total of 634 papers and analyzed the characteristics of publication outputs in various countries and *** addition,keywords analysis was conducted to reveal the main researchdirections and hot trends in the field of *** confirmed that 1)the number of papers published per year has gradually increased since 2010,and increased sharply in 2019;2)the United States was the earliest country to conduct GRSP research,while Chinacurrently has the largest number of publications;3)relevant studies focus on the role from AMF and GRSP in soil health and plant health;4)the contribution of GRSP to soil carbon and its ecological function in mitigatingclimate change are the hotspot of *** benefits of GRSP have become a consensus,however,the nature of glomalin and the mechanisms of GRSP-associated benefits still need to *** an important soil recalcitrant organic carbon,further studies are need to elucidate the land-ocean biogeochemical processes of GRSP and its contribution to global blue carbon.

关键词： Carbon sequestration plant resistance heavy metal soil aggregate

Processes of coastal ecosystem carbon sequestration and approaches for increasing carbon sink

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Science China Earth Sciences 2017年第5期60卷 809-820页

作者： ZHANG Yao ZHAO MeiXun CUI Qiu FAN Wei QI JiaGuo CHEN Ying ZHANG YongYu GAO KunShan FAN JingFeng WANG GuangYi YAN ChongLing lu haoliang luO YaWei ZHANG ZiLian ZHENG Qiang XIAO Wei JIAO NianZhi State Key Laboratory for Marine Environmental Science Xiamen 361100 China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education Ocean University of China Qingdao 266101 China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao 266101 China Ocean College Zhejiang University Zhoushan 316021 China National Marine Environmental Monitoring Center Dalian 116023 China School of Environmental Science and Engineering Tianjin University Tianjin 300387 China College of the Environment and Ecology Xiamen University Xiamen 361100 China

The oceans are the largest carbon pools on Earth, and play the role of a "buffer" in climate change. Blue carbon, the carbon(mainly organic carbon) captured by marine ecosystems, is one of the important mechanisms of marine carbon *** carbon was initially recognized only in the form of visible coastal plant carbon sequestration. In fact, microorganisms(phytoplankton, bacteria, archaea, viruses, and protozoa), which did not receive much attention in the past, account for more than 90% of the total marine biomass and are the main contributors to blue carbon. Chinese coastal seas, equivalent to 1/3 of China's total land area, have a huge carbon sink potential needing urgently research and development. In this paper, we focus on the processes and mechanisms of coastal ocean's carbon sequestration and the approaches for increasing that sequestration. We discuss the structures of coastal ecosystems, the processes of carbon cycle, and the mechanisms of carbon sequestration. Using the evolution of coastal ocean's carbon sinks in sedimentary records over geologic times, we also discuss the possible effects of natural processes and anthropogenic activities on marine carbon sinks. Finally, we discuss the prospect of using carbon sequestration engineering for increasing coastal ocean's carbon storage capacity.

关键词： Coastal ocean's carbon sink Mechanism for increasing carbon sink Microorganism Climate change

In-situ tracking of phase conversion reaction induced metal/metal oxides for efficient oxygen evolution

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Science China Materials 2021年第2期64卷 362-373页

作者： Shahid Khan Chao Wang haoliang lu Yufeng Cao Zeyang Mao Chenglin Yan Xianfu Wang Soochow Institute for Energy and Materials Innovations College of EnergySoochow UniversitySuzhou215006China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China School of Chemical and Environmental Engineering College of ChemistryChemical Engineering and Material ScienceSoochow UniversitySuzhou215123China

Due to the unique interface and electronic structure,metal/metal oxide composite electrocatalysts have been designed and exploited for electrocatalytic oxygen evolution reaction(OER)in alkaline ***,how to fabricate metal/metal oxides with abundant interfaces and well-dispersed metal phases is a challenge,and the synergistic effect between metal and metal oxides on boosting the electrocatalytic activities is still ***,by controlling the lithium-induced conversion reaction of metal oxides,metal/metal oxide composites with plentiful interfaces and excellent electrical interconnection are fabricated,which can enhance the active sites,and accelerate the mass transfer during the electrocatalytic *** a result,the electrocatalytic oxygen evolution activities of the as-fabricated metal/metal oxide composite catalysts including NiCo/NiCo2O4,NiMn/NiMn2O4 and CoMn/CoMn2O4 are greatly *** catalytic mechanism is also explored using the in-situ X-ray and Raman spectroscopic tracking to uncover the real active centers and the synergistic effect between the metal and metal oxides during water *** functional theory plus U(DFT+U)calculation confirms the metal in the composite can optimize the catalytic reaction path and reduce the reaction barrier,thus boosting the electrocatalytic kinetics.

关键词： in-situ tracking electrochemical conversion reaction metal/metal oxide interfaces electrocatalytic mechanism oxygen evolution

Highly efficient lithium utilization in lithium metal full-cell by simulated missile guidance and confinement systems

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Science China Materials 2021年第4期64卷 830-839页

作者： Jinqiu Zhou haoliang lu Xi Zhou Haoqing Ji Yawen Sun Tao Qian Chenglin Yan Soochow Institute for Energy and Materials Innovations College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Institute of Chemical Industry of Forestry Products Chinese Academy of ForestryNanjing 210042China

The efficient utilization of metallic lithium(Li)is the key to enable application of Li metal full-cell with low amount of excess Li,contributing to higher safety and energy ***,we report an extraordinary Li metal full-cell with only 20%excess Li,which demonstrated significantly improved reversibility and high Coulombic *** simulated missile guidance and confinement system(SMGCS)was designed to guide and confine Li deposition through constructing compatible silver lithiophilic sites and nitrate *** sites act as effective Li nuclei to attract Li ions and direct the initial *** generated nitrate layer affords an interfacial environment favorable for confined and uniform deep Li deposition,which is theoretically verified by molecular dynamics(MD)*** two combined merits offer a robust and dendrite-free Li deposition,enabling the application of Li metal full-cell with slight excess *** also result in an outperformed Li cycling efficiency of ca.99%for over 300 cycles along with deep cycling at a high capacity of 10 mA h cm^(-2)in carbonate *** unprecedented high degree of Li utilization opens a new avenue for the future development of highly efficient Li metal full-cells.

关键词： lithium utilization lithium metal full-cell Li nucleation Li deposition

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SP_3方程的非线性迭代解法研究

核动力工程 2017年第3期38卷 38-42页

作者：潘清泉卢皓亮蔡利李冬生王侃清华大学工程物理系北京100084 中广核研究院有限公司广东深圳518031

SP_3方程是简化球谐函数法三阶展开的中子输运方程,比扩散方程的计算精度更高。本文采用非线性迭代的方法求解SP_3方程,并且提出了带角度离散的耦合修正关系式,解决了SP_3方程在真空边界条件下耦合修正关系复杂和非线性迭代中二阶中子... 详细信息

SP_3方程是简化球谐函数法三阶展开的中子输运方程,比扩散方程的计算精度更高。本文采用非线性迭代的方法求解SP_3方程,并且提出了带角度离散的耦合修正关系式,解决了SP_3方程在真空边界条件下耦合修正关系复杂和非线性迭代中二阶中子注量率修正数值不稳定的问题。基于该方法编制非线性迭代求解SP_3方程的计算程序NLSP3,对基准题进行了计算。数值结果表明,本文所采用的非线性迭代求解SP_3的方法是正确的,且具有较好的计算精度。

关键词：半解析节块法非线性迭代简化球谐函数法数值不稳定性

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耐低温生物脱氮机制与对策研究进展

化工进展 2020年第1期39卷 372-379页

作者：陆浩良田晴朱艳彬张健焦彭博林欢东华大学环境科学与工程学院

废水处理系统中不可避免存在着低温环境,低温使得硝化菌和反硝化菌的活性下降,如何在低温条件下提高污水生物脱氮效果是废水处理研究工作中亟待解决的问题。本文对近年来研究发现的低温微生物耐低温机制进行了梳理,提出了最近发现的胞... 详细信息

废水处理系统中不可避免存在着低温环境,低温使得硝化菌和反硝化菌的活性下降,如何在低温条件下提高污水生物脱氮效果是废水处理研究工作中亟待解决的问题。本文对近年来研究发现的低温微生物耐低温机制进行了梳理,提出了最近发现的胞外聚合物(EPS)和聚羟基脂肪酸酯(PHA)的作用机理;介绍了几种已被研究证实能在低温下进行脱氮的功能菌与一些可以提高低温污水脱氮效果的新技术/工艺(包括使用新型填料、改变碳源投加方式、投加特定的重金属);阐述了目前研究所遇到的一些问题,如缺乏工程实践、处理水质与研究菌株单一,研究结论与实际废水处理应用还有着差距。指出未来可以通过特异性功能菌的固定与使用、生物倍增技术与工程实践结合等方法来降低运行成本,提高低温污水的脱氮效果。

关键词：耐冷菌低温硝化菌反硝化生物脱氮生物强化

微波-等离子体作用下催化氧化煤制乙二醇生化尾水

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环境工程学报 2017年第2期11卷 852-856页

作者：刘浩亮陆曦刘志英徐炎华南京工业大学环境学院江苏省节水减排重点实验室南京210009

采用微波-等离子体催化氧化技术对煤制乙二醇生化尾水进行了深度氧化实验研究,实验考察了不同方法、等离子体投加量、催化剂投加量及反应时间对生化尾水的COD、UV_(254)及UV_(410)的去除率的影响。结果表明,微波-等离子体催化氧化法比... 详细信息

采用微波-等离子体催化氧化技术对煤制乙二醇生化尾水进行了深度氧化实验研究,实验考察了不同方法、等离子体投加量、催化剂投加量及反应时间对生化尾水的COD、UV_(254)及UV_(410)的去除率的影响。结果表明,微波-等离子体催化氧化法比其他方法能更快速有效的处理煤制乙二醇生化尾水。在最优实验条件:催化剂投加量20 g·L^(-1),反应时间40min,微波功率660 W,等离子体投加量80 mg·L^(-1)下,COD、UV_(254)和UV_(410)的去除率分别达到了78%、52%和68%,达到了国家一级排放标准(GB 8978-1996)。

关键词：煤制乙二醇微波催化氧化深度处理

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基于非结构网格的中子输运方程计算方法研究

西安交通大学学报 2007年第5期41卷 562-566页

作者：吴宏春巨海涛卢皓亮刘国明曹良志西安交通大学能源与动力工程学院西安710049

针对非结构网格下中子输运方程的求解方法问题,分别研究了球谐函数(P_n)有限元方法、离散纵标(S_n)有限元方法、三角形穿透概率方法和三角形节块S_n方法的计算模型．结果表明:有限元方法具有比较高的计算精度;P_n方法避免了S_n方法中的... 详细信息

针对非结构网格下中子输运方程的求解方法问题,分别研究了球谐函数(P_n)有限元方法、离散纵标(S_n)有限元方法、三角形穿透概率方法和三角形节块S_n方法的计算模型．结果表明:有限元方法具有比较高的计算精度;P_n方法避免了S_n方法中的“射线效应”现象,而S_n有限元方法则具有容易处理真空边界条件的优点;三角形穿透概率方法的计算时间最快;三角形节块S_n方法则可以保证在计算较快的情况下同时具有较高的计算精度．根据上述4种方法分别研制了相应的计算程序,利用基准题进行了验证并分析了各自的优缺点,计算结果表明每种方法均能得到满意的计算精度．

关键词：中子输运非结构网格计算方法