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Efficient removal of chlorophenols from water with a magnetic reduced graphene oxide composite

Science china.Chemistry 2016年第3期59卷 350-359页

作者： Han Yan Qing Du Hu yang Aimin Li Rongshi cheng state key Laboratory of {2. control and resource reuse School of the EnvironmentSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China

A magnetic reduced graphene oxide composite(MRGO) was successfully prepared by a simple and green method. MRGO was then used as an adsorbent and found to exhibit enhanced removal efficiency for various chlorophenols(CPs) from water compared with its precursors, graphene oxide(GO) and reduced graphene oxide. The CPs were o-chlorophenol, p-chlorophenol, 2.4-dichlorophenol, and 2.4,6-trichlorophenol. Among them, 2.4,6-trichlorophenol, which exhibited the lowest water solubility and highest molecular weight, most easily bound to MRGO. The preferential interactions between MRGO and CPs were hydrophobic interactions(?-? stacking and hydrophobic effect). This result was confirmed by the equilibrium adsorption behavior in which isotherms were all well described by Freudlich model, indicating heterogeneous and multilayer adsorption. Therefore, CP adsorption was more favored under neutral and acidic conditions, and the decreased removal efficiency of MRGO at higher p H levels was due to the improved hydrophilicity of CPs for deprotonation effect. Moreover, MRGO showed fast removal of each CP, achieving adsorption equilibrium within 10.0 min, presented efficient separation from water under an external magnetic field, and was easily regenerated using dilute Na OH aqueous solution after reaching saturated adsorption. Adsorption capacity of the regenerated MRGO had almost no loss until after five cycles. In summary, MRGO was an efficient adsorbent for the removal of various CPs and had considerable application potential in water treatment.

关键词： magnetic reduced graphene oxide composite green preparation method chlorophenol adsorption mechanism

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hemin-histamine-montmorillonite clay conjugate as a model biocatalyst to mimic natural peroxidase

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Science china.Chemistry 2015年第4期58卷 731-737页

作者： Lihui Zhang cheng Gu Jian Xiong Mei yang Yong Guo state key Laboratory of {2. control & resource reuse School of the Environment Nanjing University

We successfully synthesized the first hemin-montmorillonite bio-conjugate with an amino acid residue to mimic natural peroxidase enzyme. Histamine was intercalated in montmorillonite by cation exchange, then a heroin molecule was loaded onto the histamine-montmorillonite with an adsorption capacity of 7.0 mg· g^-1. The hemin-histamine-montmorillonite conjugate shows high peroxidase activity as indicated by the oxidation of guaiacol, which is attributed to the activation of hemin by Fe-N complex formation between the imidazole group in histamine and the iron ion in the hemin molecule. Temperaturedependent peroxidase activity for this synthesized biomimetic material indicates that raising the reaction temperature could significantly enhance the activity of the conjugate. The biomimetic catalyst has good reusability; nearly 100% activity can be retained after three cycles. Because montmorillonite clay is widely distributed in the environment, this material offers great potential for in situ and ex situ remediation of many organic contaminants in surface/subsurface soils.

关键词： hemin-histamine-montmorillonite conjugates imidazole biomimetic catalyst peroxidase activity recycle

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Preparation of new base-aluminum-chloride-loaded fiber as adsorbent for fast removal of arsenic(Ⅴ) from water

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Chinese Chemical Letters 2012年第7期23卷 863-866页

作者： Ying Meng Jin Nan Wang cheng cheng Xin {2. Ai Min Li state key Laboratory of {2. control and resource reuse&school of the environment Nanjing UniversityNanjing 210046China

A new base-aluminum-chloride-loaded fiber[PET-AA-NN-Al_2.OH）_nCl_（6-n）]was prepared with polyethylene glycol terephthalate （PET） as adsorbent for fast removal of arsenic（Ⅴ） from *** new fibrous adsorbent was characterized by using SEM and C NMR *** kinetic curve indicated that this new fibrous adsorbent could fast remove arsenic（Ⅴ） from water, and adsorption isotherm also indicated that PET-AA-NN-A1_2.OH）_nC1_（6-n） had high equilibrium adsorption capacity for arsenic（Ⅴ）.

关键词： Base-aluminum-chloride-loaded fiber Removal Arsenic (V)

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Preparation of a novel chelating resin for the removal of Ni^(2.)from water

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Chinese Chemical Letters 2014年第2期25卷 265-268页

作者： Yuan-Hui Peng Jin-Nan Wang Xin yang cheng cheng Thomas Wintgens state key Laboratory of {2. control and resource reuse ε school of the environment university of Applied Sciences Northwestern Switzerland(FHNW)

A new chelating resin DVB-MA-HDA modified with hydroxamic acid groups was prepared for the fast removal of Ni2. from water. SEM, BET, elemental analysis, FT-IR spectroscopy and XPS were used to characterize this new adsorbent. Batch adsorption experiment indicated that the equilibrium adsorption capacity of DVB-MA-HD for Ni2. was more than 130mg/g, and the adsorption isotherm can be well fitted by the Langmuir model. The adsorption kinetic curve indicates that more than 60% of the adsorption amount of Ni2. at equilibrium occurred within the initial 2. rain. 0.1 mol/L EDTA solution could desorb Ni2. from DVB-MA-HDA effectively.

关键词： jChelating resin Adsorption Ni2.

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A Comparative Analysis of environmental Quality Assessment Methods for heavy Metal-Contaminated Soils

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Pedosphere 2008年第3期18卷 344-352页

作者： LI Wei-Xin ZHANG Xu-Xiang WU Bing sun Shi-Lei CheN Yan-Song PAN Wen-{2. ZHAO Da-Yong cheng Shu-Pei state key Laboratory of {2. control and resource reuse School of the Environment Nanjing University Nanjing210093 （China） nanjing Institute of environmental Sciences State Environmental Protection Administration Nanjing 210042 （China） Department of Biology Anhui Institute of Education Hefei 230061 （China）

Four assessment methods （two pollution indexes and two fuzzy mathematical models） were employed to investigate the environmental quality of four soils around a ferroalloy plant in nanjing City. environmental quality was assessed as class Ⅳ （moderately polluted） for each soil with single-factor index method, and was identified to be classes Ⅳ, Ⅲ （slightly polluted）, Ⅲ, and Ⅲ for soils A, B, C, and D, respectively, with the comprehensive index model. In comparison with the single-factor index method, the comprehensive index model concerned both dominant parameter and average contribution of all factors to the integrated environmental quality. Using the two fuzzy mathematical methods （single-factor deciding and weighted average models）, the environmental risks were determined to be classes Ⅳ, Ⅲ, Ⅱ （clean）, and Ⅱ for soils A, B, C, and D, respectively. However, divergence of the membership degree to each pollution class still occurred between the two methods. In fuzzy mathematical methods, membership functions were used to describe the limits between different pollution degrees, and different weights were allocated for the factors according to pollution contribution. Introduction of membership degree and weight of each factor to fuzzy mathematical models made the methods more reasonable in the field of environmental risk assessment.

关键词： environmental assessment fuzzy mathematical model heavy metal pollution pollution index method soil

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微藻在农业可持续发展中的应用研究进展

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农业工程学报 2024年第3期40卷 14-25页

作者：赵江侯琤沈峥张亚雷上海市乡村振兴研究中心上海200002 同济大学环境科学与工程学院上海200092 同济大学新农村发展研究院上海200092 同济大学国家设施农业工程技术研究中心上海200092 同济大学污染控制与资源化研究国家重点实验室上海200092

近年来,饲料、饵料产量不足和化肥、农药大量施用带来的环境污染问题给农业可持续发展带来了巨大挑战。微藻因其含有能够促进动植物生长、提高农产品品质的营养元素和生物活性物质,且能同化氮、磷等污染物,被广泛应用于农业种植业、畜... 详细信息

近年来,饲料、饵料产量不足和化肥、农药大量施用带来的环境污染问题给农业可持续发展带来了巨大挑战。微藻因其含有能够促进动植物生长、提高农产品品质的营养元素和生物活性物质,且能同化氮、磷等污染物,被广泛应用于农业种植业、畜禽业和水产养殖业。该文系统总结和分析了微藻在土壤改良、农作物保护、直接刺激农作物生长、畜禽和水产养殖废水处理、饲料和饵料等领域的应用现状、特征和环境与经济效益,以及面临的机遇和挑战。分析发现,通过优化微藻培养技术降低其规模化应用的采收成本和提高其对污染物的去除效率,系统增强其在农业应用中的经济价值和可持续性,为农业可持续发展提供科技支撑是未来微藻研究的重点关注方向。

关键词：微藻农业可持续发展微藻肥料微藻饲料饵料农业废水治理

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Clean-up and disposal process of polluted sediments from urban rivers

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Journal of environmental Sciences 2001年第4期13卷 435-438页

作者： he Pin-jing SHAO Li-ming GU Guo-wei BIAN cheng-lin XU Chen state key Laboratory of {2. control and resource reuse school of environmental Science and Engineering Tongji UniversityShanghai 200092China Urban River Management Agency Yangpu Di strictShanghai 200093China

In this paper, the discussion is concentrated on the properties of the polluted sediments and the combination of clean-up and disposal process for the upper layer heavily polluted sediments with good flowability. Based on the systematic analyses of various clean-up processes, a suitable engineering process has been evaluated and recommended. The process has been applied to the river reclamation in yangpu District of Shanghai City, china. An improved centrifuge is used for dewatering the dredged sludge, which plays an important role in the combination of clean-up and disposal process. The assessment of the engineering process shows its environmental and technical economy feasibility, which is much better than that of traditional dredging-disposal processes.

关键词： urban rivers polluted sediments clean-up disposal dredging dewatering feasibility analysis

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Formable porous biochar loaded with La-Fe(hydr)oxides/montmorillonite for efficient removal of phosphorus in wastewater:process and mechanisms

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Biochar 2022年第1期4卷 296-314页

作者： Enhui sun Yanyang Zhang Qingbo Xiao Huayong Li Ping Qu {2. Yong Bingyu Wang Yanfang Feng Hongying Huang Linzhang yang Charles Hunter key Laboratory of Saline-Alkali Soil Improvement and Utilization(Coastal Saline-Alkali Lands) Ministry of Agriculture and Rural AffairsJiangsu Collaborative Innovation Center for Solid Organic Waste Resource UtilizationInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China school of Life Sciences College of AgricultureEngineering and ScienceUniversity of KwaZulu-Natal(Pietermaritzburg Campus)Private Bag X01Scottsville 3209Republic of South Africa state key Laboratory of {2. control and resource reuse School of the EnvironmentNanjing UniversityNanjing 210023China Institute of Germplasm resources and Biotechnology Jiangsu Academy of Agricultural SciencesNanjing 210014China Jiangsu key Laboratory of Chemical {2. control and resources reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China

The development of biochar-based granule-like adsorbents suitable for scaled-up application has been attracting increasing attention in the field of water ***,a new formable porous granulated biochar loaded with La-Fe(hydr)oxides/montmorillonite(LaFe/MB)was fabricated via a granulation and pyrolysis process for enhanced phosphorus(P)removal from *** acted as a binder that increased the size of the granulated biochar,while the use of Fe promoted the surface charge and facilitated the dispersion of La,which was responsible for selective phosphate ***/MB exhibited rapid phosphate adsorption kinetics and a high maximum adsorption capacity(Langmuir model,52.12.mg P g^(−1)),which were better than those of many existing granulated *** desorption and recyclability experiments showed that LaFe/MB could be regenerated,and maintained 76.7%of its initial phosphate adsorption capacity after four adsorption *** high hydraulic endurance strength retention rate of the developed material(91.6%)suggested high practical applicability in actual ***-static attraction,surface precipitation,and inner-sphere complexation via ligand exchange were found to be involved in selective P removal over a wide pH range of *** thermodynamic parameters were determined,which revealed the feasibility and spontaneity of *** on approximate site energy distribution analyses,high distribution frequency contributed to efficient P *** research results provide a new insight that LaFe/MB shows great application prospects for advanced phosphate removal from wastewater.

关键词： Formable porous biochar Montmorillonite Metal(hydr)oxide Wastewater phosphate removal Adsorption mechanism

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Changes of Bacterial Community Structure in Copper Mine Tailings After Colonization of Reed (Phragmites communis)

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Pedosphere 2008年第6期18卷 731-740页

作者： CheN Yu-Qing REN Guan-ju AN Shu-Qing {2. Qing-Ye LIU Chang-Hong SHUANG Jing-Lei College of Life Science Nanjing Normal University Nanjing 210046 （China） The state {2. Laboratory of pollution control and resource reuses School of Life Science Nanjing University Nanjing 210093 （China） school of Life Science Anhui University Hefei 230039 （China）

Soil samples were collected from both bare and vegetated mine railings to study the changes in bacterial communities and soil chemical properties of copper mine tailings due to reed （Phragmites communis） colonization. The structures of bacterial communities were investigated using culture-independent 16S rRNA gene sequencing method. The bacterial diversity in the bare mine tailing was lower than that of the vegetated mine tailing. The former was dominated by sulfur metabolizing bacteria, whereas the latter was by nitrogen fixing bacteria. The bare mine tailing was acidic （pH = 3.78）, whereas the vegetated mine tailing was near neutral （pH ： 7.2.）. The contents of organic matter, total nitrogen, and ammonium acetate-extractable potassium in vegetated mine tailings were significantly higher than those in the bare mine railings （P 〈 0.01）, whereas available phosphorus and electrical conductivity were significantly lower than those in the bare mine tailings （P 〈 0.01）. The results demonstrated that 16S rRNA gene sequencing could be successfully used to study the bacterial diversity in mine tailings. The colonization of the mine tailings by reed significantly changed the bacterial community and the chemical properties of tailings. The complex interactions between bacteria and plants deserve further investigation.

关键词： 16S rRNA gene bacterial diversity bacterial community functional group mine tailings

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中国碳收支:1980~2.2.年

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Science Bulletin 2024年第1期69卷 114-124页

作者：夏晓圣任培阳王旭辉刘丹陈修治丹利何斌何洪林居为民梁敏琪陆星劼彭静覃章才夏江周郑博魏静乐旭于贵瑞朴世龙袁文平 school of Atmospheric Sciences Guangdong Province Data Center of Terrestrial and Marine Ecosystems Carbon CycleSun Yat-sen UniversityZhuhai 510245China Sino-French Institute for Earth System Science College of Urban and Environmental SciencesPeking UniversityBeijing 100091China state key Laboratory of Tibetan Plateau Earth System Resources and EnvironmentInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China key Laboratory of Regional Climate-environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China state key Laboratory of Earth Surface Processes and {2. Ecology College of Global Change and Earth System ScienceBeijing Normal UniversityBeijing 100875China Synthesis Research Center of china.s Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China International Institute for Earth System Science Nanjing UniversityNanjing 210023China Tianjin key Laboratory of Water resources and {2. Tianjin Normal UniversityTianjin 300387China Institute of environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Jiangsu key Laboratory of Atmospheric {2. Monitoring and pollution control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing 210044China

As one of the world's largest emitters of greenhouse gases,china.has set itself the ambitious goal of achieving carbon peaking and carbon ***,it is crucial to quantify the magnitude and trend of sources and sinks of atmospheric carbon dioxide(CO_(2.),and to monitor china.s progress toward these *** state-of-the-art datasets and models,this study comprehensively estimated the anthropogenic CO_(2.emissions from energy,industrial processes and product use,and waste along with natural sources and sinks of CO_(2.for all of china.during *** recognize the differences among various methods of estimating greenhouse emissions,the estimates are compared with china.s National Greenhouse Gas Inventories(NGHGIs)for 1994,2.05,2.10,2.12.and *** CO_(2.emissions in china.have increased by 7.39 times from 1980 to 12.77 Gt CO_(2.a^(-1)in *** benefiting from ecological projects(e.g.,Three Norths Shelter Forest System Project),the land carbon sink in china.has reached 1.65 Gt CO_(2.a^(-1)averaged through 2.10-2.2.,which is almost 15.81 times that of the carbon sink in the *** average,china.s terrestrial ecosystems offset 14.69%±2.49%of anthropogenic CO_(2.emissions through *** provincial-level administrative regions of china.Xizang and Qinghai,have achieved carbon neutrality according to our estimates,but nearly half of the administrative regions of china.have terrestrial carbon sink offsets of less than 10%of anthropogenic CO_(2.*** study indicated a high level of consistency between NGHGIs and various datasets used for estimating fossil CO_(2.emissions,but found notable differences for land carbon *** estimates of the terrestrial carbon sinks of NGHGIs urgently need to be verified with process-based models which integrate the comprehensive carbon cycle processes.

关键词： CO_(2.emission Land carbon sink china Carbon neutrality Carbon budget

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