氨基膨润土制备、表征及对铜、镍、镉的吸附性能研究  

Preparation,Characterization and Adsorption Ability to Cu^(2+),Ni^(2+),Cd^(2+) of Amine-modified Bentonite

作　　者：项念念[1] 朱霞萍[1] 田应凤[1] 谭俊[1] 刘文华[2] 赵秋香[2] 李海萍[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4期79-82,共4页Non-Metallic Mines

基　　金：国土资源部公益性行业科研专项项目(201111016)

摘　　要：以钙基膨润土为原料,四乙烯五胺(TEPA)为改性剂,采用溶液法制备氨基化膨润土。最佳制备条件为:反应液固比40∶1(mL/g)、膨润土与四乙烯五胺固液比1∶0.05(g/mL)、反应时间5 h、反应温度25℃。采用傅里叶变换红外光谱(FTIR)、X射线衍射分析(XRD)技术对改性前后膨润土进行了表征,证实TEPA已成功负载到膨润土上,没有改变膨润土原有晶体结构。对氨基膨润土吸附去除模拟废水中Cu2+、Ni2+、Cd2+进行了研究,结果表明,氨基化膨润土对这3种重金属离子的饱和吸附容量分别达到450、300、230 mmol/kg,吸附能力都明显优于原土,分别是原土的14.88、8.88、13.05倍。氨基膨润土对这3种金属离子的吸附容量大小与四乙烯五胺形成的络合物的稳定性有关。In this paper, a new amine-modified bentonite was prepared by solution method with the Ca-base bentonite as raw materials and tetraethylenepentamine（TEPA） as modifier. The optimal conditions for the preparation were obtained, the proportion between liquid and solid reactant was 40 ： 1 （mL/g）, the ratio of bentonite and TEPA was 1 ： 0.05 （g/mL）, the reaction time was 5 h and the reaction temperature was 25 ℃. The original bentonite and amine-modified bentonite were characterized by FTIR and XRD, the results indicated that TEPA was incorporated onto bentonite successfully, but the original crystal structure of bentonite was not changed. The adsorption experiments of amine-modified bentonite to Cd^2＋, Ni^2＋, Cu^2＋ in simulated wastewater were carried out, the results showed that the saturated adsorption capacity were 450, 300, 230 mmol/kg, respectively. The adsorption ability of amine-modified bentonite to Cd^2＋, Ni^2＋, Cu^2＋ were much better than Ca-basebentonite, were 14.88, 8.88 and 13.05 times as much as original bentonite, respectively. The adsorption capacity was in accord with the complexing stability constant of metal ions and TEPA.

关 键 词：膨润土 四乙烯五胺 表征 金属离子 吸附 

分 类 号：X703[环境科学与工程—环境工程] TQ424.24[化学工程]