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天然有机质和金属离子在矿物表面的共吸附
引用本文:易层,严玉鹏,王小明,胡震,熊娟,刘凡,冯雄汉,谭文峰.天然有机质和金属离子在矿物表面的共吸附[J].农业环境科学学报,2018,37(8):1574-1583.
作者姓名:易层  严玉鹏  王小明  胡震  熊娟  刘凡  冯雄汉  谭文峰
作者单位:华中农业大学资源与环境学院农业部长江中下游耕地保育重点实验室
基金项目:国家重点研发计划项目(2017YFD0200201);国家自然科学基金项目(41603100)
摘    要:天然有机质(NOM)在土壤、沉积物和水体等环境中无处不在,其中富里酸和胡敏酸是主要形态。富里酸及胡敏酸活性高,易与天然矿物颗粒和金属离子发生相互作用,影响矿物的表面化学特性以及金属离子的形态与迁移性,进而在控制环境中金属离子的生物有效性和毒性等方面起重要作用。本文主要综述了富里酸和胡敏酸等NOM和金属离子在矿物表面共吸附特性与主要影响因素,归纳了表面络合模型和现代光谱技术在上述三元体系研究中的应用及其反应机制研究进展。NOM在较大程度上改变了金属离子在矿物表面的吸附特性和反应机制,并受体系pH、金属离子类型和浓度、NOM浓度、NOM和金属离子的添加顺序、矿物类型等因素的影响。低pH时,NOM通常促进矿物对金属离子的吸附。NOM和金属离子在矿物表面的共吸附机制包括:NOM和金属离子竞争吸附表面活性吸附位点;在溶液中形成NOM-金属离子络合物;形成金属离子桥接矿物表面位点与NOM的A型三元络合物(矿物-金属离子-NOM)或NOM联接矿物表面与金属离子的B型三元表面络合物(矿物-NOM-金属离子);静电作用改变表面电荷特征。最后展望了天然有机质等配体与金属离子在矿物表面共吸附有关的研究热点和方向。

关 键 词:天然有机质  富里酸  胡敏酸  金属离子  矿物  共吸附
收稿时间:2018/3/7 0:00:00

Co-sorption of natural organic matter and metal ions on minerals
YI Ceng,YAN Yu-peng,WANG Xiao-ming,HU Zhen,XIONG Juan,LIU Fan,FENG Xiong-han and TAN Wen-feng.Co-sorption of natural organic matter and metal ions on minerals[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2018,37(8):1574-1583.
Authors:YI Ceng  YAN Yu-peng  WANG Xiao-ming  HU Zhen  XIONG Juan  LIU Fan  FENG Xiong-han and TAN Wen-feng
Institution:Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China,Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China and Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Abstract:Natural organic matter(NOM)is ubiquitous in soils, sediments, and water. Fulvic acid(FA)and humic acid(HA), which are predominant NOM species, are highly reactive and can readily interact with natural mineral particles and metal ions. These reactions can affect the surface chemical properties of minerals as well as the speciation and mobility of metal ions, thereby controlling the bioavailability and toxicity of metals in the environment. This review discusses the co-adsorption characteristics and major factors influencing the interaction of NOM(such as FA and HA)with metal ions on mineral surfaces in the ternary complex. Progress on research on spectroscopic and surface complexation modeling methods used to study the ternary systems and related reaction mechanisms are summarized. The role of NOM in changing the adsorption characteristics and reaction mechanisms of metal ions on a mineral surface is affected by many factors; major ones include pH, types and concentrations of metal ions and NOM, the order in which NOM and metal ions are added, and type of mineral. The presence of NOM generally leads to the increased sorption of metal ions on minerals at low pH. Possible mechanisms include i) NOM and metal ion competition for the reactive sites on mineral surfaces; ii)formation of metal ion-NOM complexes; iii)formation of type A ternary surface complexes(in which cations form bridges between mineral surfaces and NOM)or type B ternary surface complexes(in which cations are associated with the ligands on NOM that are not involved in complexation with mineral surfaces); and iv)electrostatic interactions that change the charge of the surface. Finally, gaps and future efforts needed on research on the co-sorption of ligands, such as NOM, with metal ions on mineral surfaces are discussed.
Keywords:natural organic matter  fulvic acid  humic acid  metal ions  minerals  co-adsorption
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