检索结果-内蒙古大学图书馆

Fabrication of CuS/BiVO 4 (0 4 0) binary heterojunction photocatalysts with enhanced photocatalytic activity for Ciprofloxacin degradation and mechanism insight

引用

Chemical Engineering Journal 2019年 358卷 891-902页

作者： Cui Lai Mingming Zhang Bisheng Li Danlian Huang Guangming Zeng Lei Qin Xigui Liu Huan Yi Min Cheng Ling Li Zhang Chen Liang Chen College of Environmental Science and Engineering Hunan University Changsha 410082 Hunan PR China Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education Changsha 410082 Hunan PR China Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection PR China Faculty of Life Science and Technology Central South University of Forestry and Technology Changsha Hunan 410004 PR China

The photocatalytic performance of BiVO 4 is restricted via the fast recombination of photogenerated carriers and low visible light absorption. Fabricating of CuS/BiVO 4 (0 4 0) binary heterogeneous photocatalysts by in suit growing of CuS on the surface of BiVO 4 can enhance the absorption range of visible light and the separation of photogenerated carriers. Simultaneously, CuS/BiVO 4 heterogeneous can provide large surface area and more active sites. The photocatalytic activity of CuS/BiVO 4 composites for Ciprofloxacin (CIP) removal was examined under visible light irradiation. The optimal mass ratio of CuS to BiVO 4 was determined to be 7%, and the first-order kinetic constant of CIP degradation over 7% CuS/BiVO 4 (0.02151 min −1 ) was 2.59 and 16.54 times of pristine BiVO 4 and CuS, respectively. The improved photodegradation efficiency is attributed to the effective separation of photogenerated carriers via formation of p-n heterojunction. The high photostability of as-prepared CuS/BiVO 4 heterojunction photocatalysts was explored by four successive cycling experiments. The detailed mechanism for improved photocatalytic performance was discussed and the possible degradation pathway of CIP was measured by Liquid Chromatography-Mass/Mass Spectrometry. The trapping experiments and electron spin resonance (ESR) spin-trapping tests confirm that holes are main active species in photocatalytic degradation of CIP.

关键词： Photocatalysis Heterojunction CuS/BiVO 4 Photocatalytic activity Photocatalytic mechanism

来源：评论

学校读者我要写书评

暂无评论

Revealing the formation of nanoparticulate mercury sulfide in Hg(II)-DOM-Sulfide(-II) systems with nanomolar Hg(II) by using liquid chromatography-ICP-MS analysis

引用

Journal of Environmental Sciences 2025年

作者： Ying Chen Peijie Yang Yingying Guo Yanwei Liu Tao Jiang Maoyong Song Jianbo Shi Ligang Hu Yongguang Yin Yong Cai Guibin Jiang Key Laboratory of Water Pollution Control Technology Hunan Research Academy of Environmental Sciences Changsha 410004 China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China Laboratory of Environmental Nanotechnology and Health Effect Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China School of Environment Hangzhou Institute for Advanced Study UCAS Hangzhou 310024 China Interdisciplinary Research Centre for Agriculture Green Development in Yangtze River Basin College of Resources and Environment Southwest University Chongqing 400716 China Department of Chemistry and Biochemistry Florida International University Miami Florida 33199 United States

Sulfidation of mercury (Hg) in Hg(II)-dissolved organic matter (DOM)-sulfide (S(-II)) systems has crucial impacts on its transport, transformation, and bioavailability risks in food chains (e.g., from fish to humans) under anoxic environments. Probing this process remains a significant challenge due to low Hg concentrations and poor sensitivity of conventional characterization methods. Here, we systematically identified nanoparticulate mercury sulfide (nano-HgS) formation in Hg(II)-DOM-S(-II) systems at nanomolar Hg(II) levels and deciphered its environmental factors by integrating liquid chromatography (LC)-ICP-MS combined with ultrafiltration-transmission electron microscopy (TEM). Ultrafiltration-TEM with energy dispersive spectroscopy confirmed the spherical nano-HgS (∼5 nm) formation. Formation kinetics demonstrated a rapid formation of nano-HgS, followed by a slow size increase. Environmental factors, including pH, DOM, S(-II), and Ca 2+ , modulated nano-HgS size distributions by altering surface charge interactions (e.g., electrostatic repulsion), whereas natural ligands (Cl - , citrate, mercaptopropionic acid) showed negligible effects. Crucially, nano-HgS was the predominant Hg species in the Hg(II)-DOM-S(-II) systems, rather than dissolved HgS species (e.g., HgS 0 aq and HgS 2 2- ). Although nano-HgS, especially aged nano-HgS exhibits lower methylmercury production than Hg(II)-DOM complex at 24 h incubation by Geobacter sulfurreducens PCA, higher methylation for newborn nano-HgS at the initial 8 h further highlights the previously proposed “Trojan horse” mechanism of uptake followed by intracellular dissolution of nano-HgS. This work provides a significant analytical tool for accurately identifying and quantifying nano-HgS in the Hg(II)-DOM-S(-II) systems and highlights the importance of assessing the methylation of newborn nano-HgS because it may amplify Hg toxicity in food chains through providing higher methylation production.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Study on Soil Properties of Eucalyptus Plantation inHainan

引用

Agricultural Science & technology 2019年第6期20卷 36-42页

作者： XU Wei ZHANG Yu-ping YANG Zhen-yu LI Meng-yuan LI Si-yu YIN Li-chu College of Resources and Environment Hunan Agricultural UniversityNational Engineering Laboratory of Soil and Resources Efficient UtilizationHunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources UseHunan Provincial Key Laboratory of Plant Nutrition in Common UniversityChangsha 410128PRC

Taking Hainan Eucalyptus plantation as the research object with 4 other kinds of plantations or natural forest as reference plots, the effects of different forest land types on soil nutrient contents were analyzed, and the differences of soil properties were discussed. The results showed that: (1) Eucalyptus plantations were relatively helpful to reduce soil bulk density and enhance the stability of water-stable aggregates;(2) Eucalyptus plantations can improve the content of soil organic matter;(3) Soil pH showed an overall acidi fication trend under forest land conditions in Hainan;total nitrogen and alkali-hydrolyzed nitrogen content of Eucalyptus plantations showed a downward trend with the deepening of soil layer;total phosphorus and available phosphorus content showed a downward trend, while organic matter, total potassium and available K showed an upward trend. (4) The contents of total phosphorus and available phosphorus in the soil of Eucalyptus plantations of different ages did not change significantly, whereas the contents of other nutrients decreased gradually with the increase of soil depth.

关键词： Eucalyptus plantation Soil nutrients Forest age Hainan

来源：评论

学校读者我要写书评

暂无评论

Building surface defects by doping with transition metal on ultrafine TiO_2 to enhance the photocatalytic H_2 production activity

引用

Chinese Journal of Catalysis 2018年第3期39卷 542-548页

作者： Qi‐Feng Liu Qian Zhang Bing‐Rui Liu Shiyou Li Jing‐Jun Ma College of Science and Technology Agricultural University of Hebei Huanghua 061100 Hebei China Hunan Provincial Key Laboratory of Pollution Control and Resources Technology University of South China Hengyang 421001 Hunan China Hebei Agricultural Products Processing Engineering Technology Research Center Baoding 071001 Hebei China

Inefficient charge separation and limited light absorption are two critical issues associated with high‐efficiency photocatalytic H2production using *** defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic *** this study,surface defects(oxygen vacancies and metal cation replacement defects)were induced with a facile and effective approach by surface doping with low‐cost transition metals(Co,Ni,Cu,and Mn)on ultrafine *** obtained surface‐defective TiO2exhibited a3–4‐fold improved activity compared to that of the original ultrafine *** addition,a H2production rate of3.4μmol/h was obtained using visible light(λ>420nm)*** apparent quantum yield(AQY)at365nm reached36.9%over TiO2‐Cu,significantly more than the commercial *** enhancement of photocatalytic H2production activity can be attributed to improved rapid charge separation efficiency andexpanded light absorption *** hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.

关键词： Construction of surface defects Ultrafine TiO2 Low‐cost transition metal Surface doping Photocatalytic H2 production

来源：评论

学校读者我要写书评

暂无评论

controlled Deformation of Soft Nanogel Particles Generates Artificial Biominerals with Ordered Internal Structure

引用

Angewandte Chemie 2023年第19期135卷

作者： Yingxiang Dong Dr. Jialin Chi Zelun Ren Biao Xiong Ziqing Liu Wenjun Zhang Prof. Lijun Wang Prof. Syuji Fujii Prof. Steven P. Armes Prof. Yin Ning College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Guangzhou 510632 China College of Resources and Environment Huazhong Agricultural University Wuhan 430070 China Present address: National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agroenvironmental Pollution Control and Management Institute of Eco-environmental and Soil Sciences Guangdong Academy of Sciences Guangzhou 510650 China Department of Applied Chemistry Faculty of Engineering and Nanomaterials Microdevices Research Center Osaka Institute of Technology 5-16-1 Omiya Asahi-ku Osaka 535-8585 Japan Department of Chemistry University of Sheffield Brook Hill Sheffield South Yorkshire S3 7HF UK

Biominerals can exhibit exceptional mechanical properties owing to their hierarchically-ordered organic/inorganic nanocomposite structure. However, synthetic routes to oriented artificial biominerals of comparable complexity remain a formidable technical challenge. Herein we design a series of soft, deformable nanogels that are employed as particulate additives to prepare nanogel@calcite nanocomposite crystals. Remarkably, such nanogels undergo a significant morphological change—from spherical to pseudo-hemispherical—depending on their degree of cross-linking. This deformation occurs normal to the growth direction of the (104) face of the calcite and the underlying occlusion mechanism is revealed by in situ atomic force microscopy studies. This model system provides new mechanistic insights regarding the formation of oriented structures during biomineralization and offers new avenues for the design of synthetic nanocomposites comprising aligned anisotropic nanoparticles.

关键词： Biomineralization Nanogels Nanoparticle Occlusion Organic/Inorganic Nanocomposite Crystals Orientation

来源：评论

学校读者我要写书评

暂无评论

The bottom ash from municipal solid waste and sewage sludge co-pyrolysis technology: characteristics and performance in the cement mortar and concrete

引用

IOP Conference Series: Earth and Environmental Science 2020年第1期585卷

作者： Erping Li Haoyun Chen Fenglian Huang Shiqing Tian Zhiyuan Yu Hunan Research Academy of Environmental Sciences (Hunan Provincial Key Laboratory of Water Pollution Control Technology) Changsha Hunan 410002 China College of Environmental Science and Engineering Hunan University Changsha 410082 China

To efficiently and environmentally treat the municipal solid waste (MSW), co-pyrolysis technology was further developed by adding high heat value substance of sewage sludge (SS). As the co-pyrolysis technology for MSW and SS has been popularly developed, the production of the bottom ash is constantly increased. The treatment and utilization of this part of bottom has become an urgent issue. This work investigated the basic characteristics of the co-pyrolysis bottom ash and evaluated the application possibility of the co-pyrolysis bottom ash as building materials. The co-pyrolysis bottom ash possessed high chemical contents of CaO + MgO/SiO2 + Al2O3 over 88 %. Excellent performance of comprehensive and flexural strength for cement mortar and concrete were realized with the co-pyrolysis bottom ash incorporated.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Climate warming fuels the global antibiotic resistome by altering soil bacterial traits

引用

Nature ecology & evolution 2025年 2025 Jun 4页

作者： Da Lin Shuai Du Zhe Zhao Tianlun Zhang Lu Wang Qi Zhang Shu-Yi-Dan Zhou David W Graham David T Tissue Dong Zhu Yong-Guan Zhu Josep Penuelas Peter B Reich State Key Laboratory of Regional and Urban Ecology Ningbo Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Xiamen China. University of Chinese Academy of Sciences Beijing China. Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in Beilun Ningbo China. State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing China. College of Chemistry and Chemical Engineering Shaoxing University Shaoxing China. Guangdong Provincial Key Laboratory of Applied Botany South China Botanical Garden Chinese Academy of Sciences Guangzhou China. sydzhou@***. Department of Biosciences Durham University Durham UK. Hawkesbury Institute for the Environment Western Sydney University Richmond Australia. State Key Laboratory of Regional and Urban Ecology Ningbo Observation and Research Station Institute of Urban Environment Chinese Academy of Sciences Xiamen China. dzhu@***. Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in Beilun Ningbo China. dzhu@***. Global Ecology Unit CREAF-CSIC-UAB CSIC Barcelona Spain. CREAF Universitat Autònoma de Barcelona Barcelona Spain. Institute for Global Change Biology and School for Environment and Sustainability University of Michigan Ann Arbor MI USA. Department of Forest Resources University of Minnesota St. Paul MN USA. Hawkesbury Institute for the Environment Western Sydney University Sydney New South Wales Australia.

Understanding the implications of global warming on the spread of antibiotic resistance genes (ARGs) and virulence factor genes (VFGs) within soil ecosystems is crucial for safeguarding human well-being and sustaining ecosystem health. However, there is currently a lack of large-scale, systematic underpinning data needed to examine this issue. Here, using an integrative approach that combines field experiments, extensive global metagenomic data and microbial culturing, we show that warming enriches bacteria with ARGs and VFGs, increases metabolic complexity and adaptability in bacteria, and accelerates genetic alterations related to ARG and VFGs development. Our validation experiments confirm that the warming effect is more pronounced in colder regions. Machine learning predictions further suggest that warming will increase the soil ARG abundance, especially in some areas that rely heavily on fossil fuels. These results suggest another major negative consequence of global warming, highlighting the importance of developing and implementing sustainability policies that simultaneously combat climate change and antibiotic resistance.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Enzymatic nitrous oxide emissions from wastewater treatment

引用

Frontiers of Environmental Science & Engineering 2018年第1期12卷 113-124页

作者： Gang Guo Yayi Wang Tianwei Hao Di Wu Guang-Hao Chen Department of Civil ＆ Environmental Engineering The Hong Kong University of Science and Technology Hong Kong 999077 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Institute for Advanced Study The Hong Kong University of Science and Technology Hong Kong 999077 China Hong Kong Branch of the Chinese National Engineering Research Center for Control ＆ Treatment of Heavy Metal Pollution The Hong Kong University of Science and Technology Hong Kong 999077 China Wastewater Treatment Laboratory FYT Graduate School The Hong Kong University of Science and Technology Guangzhou 511458 China

Nitrous oxide （N20）, a potent greenhouse gas, is emitted during nitrogen rernoval in wastewater treatment, significantly contributing to greenhouse effect. Nitrogen removal generally involves nitrification and denitrification catalyzed by specific enzymes. N20 production and consumption vary considerably in response to specific enzyme-catalyzed nitrogen imbalances, but the mechanisms are not yet completely understood. Studying the regulation of related enzymes＂ activity is essential to minimize N20 emissions during wastewater treatment. This paper aims to review the poorly understood related enzymes that most commonly involved in producing and consuming N20 in terms of their nature, structure and catalytic mechanisms. The pathways of N20 emission during wastewater treatment are briefly introduced. The key environmental factors influencing N20 emission through regulatory enzymes are summarized and the enzyme-based mechanisms are revealed. Several enzyme- based techniques for mitigating N20 emissions directly or indirectly are proposed. Finally, areas for further research on N20 release during wastewater treatment are discussed.

关键词： Nitrous oxideMitigationEnzyme catalysisNitrogen removalWastewater treatment

来源：评论

学校读者我要写书评

暂无评论

An Overlooked Natural Hydrogen Evolution Pathway: Ni2+Boosting H2O Reduction by Fe(OH)2Oxidation during Low-Temperature Serpentinization

引用

Angewandte Chemie 2021年第45期133卷

作者： Han Song Dr. Xinwen Ou Dr. Bin Han Haoyu Deng Prof. Wenchao Zhang Prof. Chen Tian Prof. Chunfang Cai Prof. Anhuai Lu Prof. Zhang Lin Prof. Liyuan Chai School of Metallurgy and Environment Central South University Changsha Hunan 410083 China School of Environment and Energy Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling South China University of Technology Guangzhou Guangdong 510006 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Changsha Hunan 410083 China Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Beijing Key Laboratory of Mineral Environmental Function School of Earth and Space Sciences Peking University Beijing 100871 China

Natural hydrogen (H 2 ) has gained considerable attentions as a renewable energy resource to mitigate the globally increasing environmental concerns. Low-temperature serpentinization (<200 °C) as a typical water–rock reaction is a major source of the natural H 2 . However, the reaction mechanism and the controlling step to product H 2 remained unclear, which hinders the further utilization of natural H 2 . Herein, we demonstrated that the H 2 production rate could be determined by the Fe(OH) 2 oxidation during low-temperature serpentinization. Moreover, the co-existence of Ni 2+ could largely enhance the H 2 production kinetics. With the addition of only 1 % Ni 2+ , the H 2 production rate was remarkably enhanced by about two orders of magnitude at 90 °C. D 2 O isotopic experiment and theoretical calculations revealed that the enhanced H 2 production kinetics could be attributed to the catalytic role of Ni 2+ to promote the reduction of H 2 O.

关键词： Fe(OH)2 oxidation hydrogen production low-temperature serpentinization nickel water reduction

来源：评论

学校读者我要写书评

暂无评论

Study on Occurrence Speciation and Activity of Uranium Tailing Contaminants in the Presence of *** MR-1 under Anaerobic Conditions 2

Study on Occurrence Speciation and Activity of Uranium Taili...

引用

2018 2nd International Symposium on Resource Exploration and Environmental Science, REES 2018

作者： Zhang, Xichen Xie, Shuibo Liu, Hongjuan Liu, Yingjiu Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology University of South China Hengyang China Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy University of South China Hengyang China Institute of Nuclear Science and Technology University of South China Hengyang China

Taked a uranium tailings pond in hunan province as the research object, three groups of reaction systems including min (mineral group), min-dbio (mineral-dead bacteria) and min-bio (mineral-viable bacteria) were set up for the sequential batch experiments. The metal elements of U, Fe, Cd, and Pb in the uranium tailings which have reacted with S. oneidensis MR-1 for 2d, 4d, 10d, and 20d were studied by the sequential chemical extraction methods, to analyzed the effect of species of contaminants in Uranium Tailings by S. oneidensis MR-1. The results showed that the residual state is the main occurrence mode of each metal element. The release of contaminants from tailings is mainly attributed to the dissolution of exchangeable state. The complexation or adsorption of the dead bacteria and metal elements leads to the increase of the organic matter. The effect of *** MR-1 promoted the release of each metal elements in the exchangeable state, carbonate binding state, organic matter binding state and the amorphous iron manganese oxide binding state of tailings sample, and the reduction of S. oneidensis MR-1 caused U6+ to produce U4+, resulting in an increase in the content of residuals, while Fe3+ was reduced to Fe2+, resulted in an increase in the binding state of crystalline iron-manganese oxides. © Published under licence by IOP Publishing Ltd.

关键词： Bacteria

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：