粘土矿物对胡敏酸的吸附行为研究  

Study of the Sorption of Humic Acids on the Clays

作　　者：廖平凡[1] 吴平霄[1] 吴伟民[1] 陈秋强[1] 徐玉芬[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006

出　　处：《矿物岩石地球化学通报》2009年第3期272-277,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40573064);广东省自然科学基金资助项目(06025666;04020017);广东省科技计划项目(2006B36601004);教育部新世纪优秀人才支持计划(NCET-06-0747)

摘　　要：以蒙脱石和高岭土为吸附剂,分别与胡敏酸反应,研究胡敏酸在蒙脱石和高岭石上的吸附行为,并运用红外光谱、热重和Zeta电位等分析方法,表征分析了吸附前后的粘土矿物。实验结果表明,吸附过程受胡敏酸的初始浓度和pH值等因素影响;胡敏酸对粘土矿物的吸附等温线符合Freundlich等温方程;表征分析表明两种粘土矿物与胡敏酸复合体的红外光谱出现了C—H振动吸收峰;粘土矿物与胡敏酸结合后Zeta电位下降。实验的结果将有助于进一步探明环境中粘土矿物对胡敏酸的吸附机理。In present study, montmorillonite and kaolinite were selected as adsorbents to adsorb a humic acid （HA）. The adsorption of humic acid on montmorillonite and kaolin was investigated and the characteristics of HA-clay were studied by Infrared Spectroscopy （IR）, Thermo Gravimetry （TGA） and Zeta potential （Zeta）. The results indicated that adsorption rate was significantly affected by the initial concentration of HA and solution pH; the adsorption isotherms of HA on clays were well fitted by the Freundlich equation; furthermore, adsorption peaks of hydrocarbon appeared in the IR spectra of HA-kaolin. In addition, the zeta potentials of clays decreased after ad- sorption. The conclusions of this study are very important in investigating the adsorption mechanisms of humic acids on clay minerals.

关 键 词：蒙脱石 胡敏酸 高岭石 吸附 

分 类 号：P579[天文地球—矿物学]