Fe-SDS-柱撑蒙脱石制备与吸附镉的实验研究  

Preparation of Fe-SDS-Montmorillonite and Its Sorption of Cadmium

作　　者：吴伟民[1] 吴平霄[1] 李媛媛[1] 邢宁[1] 黎淑贞[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510640

出　　处：《矿物学报》2009年第3期302-308,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:40573064);广东省自然科学基金(批准号:0602566604020017);广东省科技计划(2006B36601004);教育部新世纪优秀人才支持计划(NCET-06-0747)

摘　　要：以天然的钙基蒙脱石为基质,在超声波处理的条件下制备了新型的十二烷基硫酸钠(SDS)-铁复合柱撑蒙脱石,并采用X射线粉末衍射(XRD)、红外光谱(FT-IR)和热重(TGA)对其进行表征。研究了镉在复合柱撑蒙脱石上的吸附特性,从动力学角度探讨了吸附机理。结果表明,吸附过程符合准二级动力学方程,化学吸附控制了吸附过程的速度,且平衡吸附量qe与平衡浓度eρ之间的关系符合Langmuir等温方程。Novel Fe-SDS-montmorillonite was intercalated by iron and sodium dodecyl sulfates by using Ca-montmorillonite directly under ultrasonic treatment. The results of XRD, FT-IR and TGA indicated that the modifiers have intercalated into the galleries of MMT. The adsorption capability of Fe-SDS-montmorillonite to cadmium in aqueous solution was studied, and the adsorption mechanism was focused on the viewpoint of kinetics. The adsorption dynamics follows the laws of pseudo second-order kinetics, and the chemisorption process was the rate determining step. The relationship between adsorbing capacity （qe） and equilibrium mass concentration （pe） is in accord with the isothermal adsorption equation of Langmuir.

关 键 词：Fe-SDS-柱撑蒙脱石 吸附 镉 动力学 

分 类 号：P578.967[天文地球—矿物学] P579[天文地球—地质学]