C/M及TCE初始浓度对有机-矿物质复合体中有机质的吸附行为影响  

The influence of C/M and TCE initial concentrations on the organic adsorption behavior in simulated organo-mineral complexes

作　　者：张小亮[1] 何江涛[1] 石钰婷[1] 苏思慧[1] 

机构地区：[1]中国地质大学水资源与环境学院,水资源与环境工程北京市重点实验室,北京100083

出　　处：《岩石矿物学杂志》2013年第6期809-817,共9页Acta Petrologica et Mineralogica

基　　金：国家自然科学基金项目(40702060);中央高校基本科研业务资助项目(2011PY0220)

摘　　要：有机污染物在有机-矿物质复合体上的吸附行为,是直接影响有机污染物在地质环境中迁移、转化及归宿的重要因素。为研究有机-矿物质复合体的形成及对有机污染物的吸附机理,以蒙脱石和腐植酸分别模拟地质吸附剂中的粘土矿物和有机质,制备成不同有机质含量与粘土矿物比率(C/M)的有机-矿物质复合体,对TCE进行吸附批实验。实验结果表明,腐殖酸与蒙脱石结合后提高了有机-矿物质复合体的界面疏水性,同时两者之间的相互作用也可能使得复合体中部分腐殖酸变的更加紧密,从而在一定程度上影响了整个固相介质的吸附行为;源腐植酸的Kom值为0.587 1 L/g,形成有机-矿物质复合体后Kom值均大于源腐植酸,随着复合体中C/M值的增加Kom值变化较小;TCE初始浓度的高低影响Kom值,以液相初始浓度500μg/L为分界线,在低浓度段Kom值随着浓度的增加而减小,在高浓度段K值随着浓度的增加基本趋于稳定,此时TCE初始浓度对有机-矿物质复合体吸附行为的影响较小。In geological environment,the adsorption behavior of organic pollutants in organo-mineral complexes influences considerably the migration,transformation and end result of organic pollutants.Batch sorption experiments with clay mineral （montmorillonite） and organic matter （humic acid） ratio were designed to adsorb trichloroethylene （TCE） with the purpose of studying the formation and adsorption mechanism of organo-mineral complexes.The results indicate that the interaction between organic and clay mineral improves the interface hydrophobicity of organo-mineral complexes.Meanwhile,the compositions,structures and properties of organic matter in the organo-mineral complexes may change,which can also affect its adsorption behavior.The Kom of adsorbed TCE in the organo-mineral complexes is higher than that of the source humic acid （HA）（0.587 1 L/g）,and hardly changes with the increase of the C/M value.TCE initial concentration also has an influence on the Kom value.With C0 =500 μg/L as the boundary,the Kom value increases with the increase of C/M when the concentration is lower than C0,and it tends to be stable when the concentration is higher than C0,with the TCE initial concentration having little effect on adsorption behavior.

关 键 词：有机-矿物质复合体 吸附 有机质与无机矿物比率(C M) 三氯乙烯 

分 类 号：X783[环境科学与工程—环境工程] P579[天文地球—矿物学]