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

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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 {3. 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

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 {3. control & resource reuse School of the Environment Nanjing University

We successfully synthesized the first hemin-montmorillonite bio-con{3.gate 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 con{3.gate 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 con{3.gate. 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

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 yang Ai Min Li state key laboratory of {3. 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)

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 {3. 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 13.mg/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 20 rain. 0.1 mol/L EDTA solution could desorb Ni2＋ from DVB-MA-HDA effectively.

关键词： jChelating resin Adsorption Ni2+

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-yang ZHAO Da-Yong {3. Shu-Pei state key laboratory of {3. 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 {3.al quality of four soils around a ferroalloy plant in Nanjing City. {3.al 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 {3.al quality. Using the two fuzzy mathematical methods （single-factor deciding and weighted average models）, the {3.al 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 {3.al risk assessment.

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

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 cheng 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 {3. 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 {3. 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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中国碳收支:1980~2021年

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 {3. 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 {3. Tianjin Normal UniversityTianjin 300387China Institute of environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Jiangsu key laboratory of Atmospheric {3. 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 1994,2005,2010,2012,and *** CO_(2)emissions in china have increased by 7.3. 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 2010-2021,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

不同晶型锰氧化物去除地下水中氨的效能与机理

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中国环境科学 2024年第9期44卷 4978-4986页

作者：程亚苗安琪黄廷林文刚西安建筑科技大学环境与市政工程学院陕西省环境工程重点实验室西北水资源与环境生态教育部重点实验室陕西省水污染控制与水质安全保障协同创新中心陕西西安710055

研究了3.不同晶型二氧化锰(α-MnO_(2)、γ-MnO_(2)、δ-MnO_(2))去除地下水中氨的效能与机理,并考察了负载γ-MnO_(2)滤料填充滤柱实际应用效果.结果表明,γ-MnO_(2)催化氧化除氨效果最优(γ-MnO_(2)>α-MnO_(2)>δ-MnO_(2)),第20d 5m... 详细信息

研究了3.不同晶型二氧化锰(α-MnO_(2)、γ-MnO_(2)、δ-MnO_(2))去除地下水中氨的效能与机理,并考察了负载γ-MnO_(2)滤料填充滤柱实际应用效果.结果表明,γ-MnO_(2)催化氧化除氨效果最优(γ-MnO_(2)>α-MnO_(2)>δ-MnO_(2)),第20d 5mg/L氨可以被完全去除,且其中间产物亚硝酸盐氮的积累时间最短,峰值最低.γ-MnO_(2)负载滤料填充滤柱可以快速(第6d)具备优异的催化除氨能力,当进水氨为2.0mg/L时,出水氨低于标准限值(<0.5mg/L).结合材料表征分析结果发现,γ-MnO_(2)具备最优的催化氧化除氨能力主要是由于其较高的锰平均氧化态与其丰富的表面羟基氧,其电子传递能力最强.本研究为锰氧化物在饮用水除氨领域的应用提供了理论指导,γ-MnO_(2)负载滤料具有良好的催化氧化除氨稳定性和效能,为实际工程中催化氧化活性滤料的制备提供了新思路.

关键词：晶型锰氧化物氨催化氧化地下水

Cationic content effects of biodegradable amphoteric chitosan-based flocculants on the flocculation properties

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Journal of environmental Sciences 2012年第8期24卷 1378-1385页

作者： Zhen yang Yabo Shang Xin Huang Yichun Chen Yaobo Lu Aimin Chen Yuxiang Jiang Wei Gu Xiaozhi Qian Hu yang Rongshi cheng state key laboratory of {3. control and resource reuse School of the EnvironmentSchool of Chemistry&Chemical EngineeringNanjing UniversityNanjing 210093China Zhenjiang Water Supply Company Zhenjiang 212009China

A series of biodegradable amphoteric chitosan-based flocculants （3.chloro-2-hydroxypropyl trimethyl ammonium chloride （CTA） modified carboxymethyl chitosan, denoted as CMC-CTA） with different substitution degrees of CTA were prepared successfully. The content of carboxymethyl groups in each CMC-CTA sample was kept almost constant. The solubility of the various flocculants showed that, higher cationic content of flocculants caused a better solubility. The flocculation experiments using kaolin suspension as synthetic water at the laboratory scale indicated that the substitution degree of CTA was one of the key factors for the flocculation properties. With the increase of cationic content, the flocculants were demonstrated better flocculation performance and lower dosage requirement. Flocculation kinetics model of particles collisions combining zeta potential and turbidity measurements was employed to investigate the effects of the cationic content of the flocculants on the flocculation properties from the viewpoint of flocculation mechanism in detail. Furthermore, flocculation performance using raw water from Zhenjiang part of yangtze River at the pilot scale showed the similar effects to those at the laboratory scale.

关键词： amphoteric chitosan-based flocculants substitution degree of CTA flocculation kinetics and mechanism