巯基改性蒙脱石对Cd2＋的吸附及酸雨解吸  

Cd^(2+) Adsorption on Thiol-modified Montmorillonite and Desorption by Acid Rain

作　　者：刘慧[1] 朱霞萍[1] 韩梅[1] 赖凤[1] 刘文华[2] 赵秋香[2] 

机构地区：[1]成都理工大学材料与化学化工学院,四川省矿产资源化学高校重点实验室,四川成都610059 [2]广东省物料实验检测中心,广东广州510080

出　　处：《非金属矿》2013年第3期69-72,共4页Non-Metallic Mines

基　　金：广东省财政厅地质专项(2011208)

摘　　要：使用3-巯丙基三甲氧基硅烷对蒙脱石原土(MMT)进行巯基改性,采用FT-IR和X射线衍射进行表征。结果表明,MMT被成功嫁接巯基,得到巯基改性蒙脱石(MMT-SH)。对MMT和MMT-SH进行Cd2+的吸附及酸雨对其吸附Cd2+的解吸实验,结果表明,MMT-SH对Cd2+的吸附能力远高于MMT,Cd2+饱和吸附容量提高了近39倍,酸雨对其吸附的Cd2+解吸量远低于MMT;pH值、固液比、离子强度等因素对MMT-SH吸附Cd2+及酸雨对其吸附的Cd2+解吸的影响远小于MMT;MMT-SH吸附Cd2+是以螯合作用为主,离子交换与静电吸附为辅。Thiol-modified montmorillonite （MMT-SH） was prepared through modifying nature montmorillonite （MMT） with 3-mercaptopropyltfi methoxysilane, the characteristic result of FT-IR and XRD indicated the successful tethering of thiol group on montmorillonite. The experimental results of cadmium adsorption on MMT and MMT-SH and desorption by acid rain showed that adsorption capacity of MMT-SH was much better than MMT, saturated adsorption capacity of Cd2＋ had increased by 39 times, and desorption capacity of Cd~＋ by acid rain was far less than MMT; the effects of pH value, solid-liquid ratio and ionic strength on cadmium adsorption and desorption on MMT-SH were much less than that on MMT; cadmium adsorption on MMT-SH was dominated by chelation and supplemented by ion-exchange and electrostatic adsorption.

关 键 词：巯基 蒙脱石 镉 吸附 解吸 

分 类 号：TD975.5[矿业工程—选矿] X703[环境科学与工程—环境工程]