凹凸棒石对Zn^2+、Cu^2+、Cd^2+的等温吸附实验研究  

Study of attapulgite on the isotherm adsorption of Zn^2+,Cu^2+and Cd^2+

作　　者：杨秀敏 YANG Xiumin(ZHAI Mingguo Academician Workstation,University of Sanya,Sanya 572022,China)

机构地区：[1]三亚学院翟明国院士工作站,海南三亚572022

出　　处：《中国矿业》2020年第11期94-99,共6页China Mining Magazine

基　　金：三亚学院引进人才项目“黏土矿物与菌根联合原位钝化土壤重金属的实验研究”资助(编号:USYRC19-19);海南省基础与应用基础研究计划(自然科学领域)高层次人才项目“海南省岛水资源承载力时空动态特征及预警预测研究”资助(编号:2019RC256);国家社科基金项目“基于生态系统生产总值核算的海南省生态文明建设范例研究”资助(编号:15BJY025)。

摘　　要：凹凸棒石是一种比表面积大,吸附能力强的天然黏土矿物。为了研究凹凸棒石的吸附特征,通过等温吸附实验,进行了凹凸棒石对复合重金属离子Zn^2+、Cu^2+、Cd^2+的吸附容量、去除率、吸附选择性和富集系数的研究。结果表明:凹凸棒石对Zn^2+、Cu^2+、Cd^2+吸附容量表现为随溶液初始浓度的增加而增加,吸附选择特征表现为对Cu^2+的吸附大于对Zn^2+和Cd^2+的吸附。当重金属离子初始浓度在20 mg/L时凹凸棒石对Cu^2+的去除率为97.40%,而对Zn^2+、Cd^2+的去除率分别为96.76%和96.22%;当浓度增加到300 mg/L时,对Cu^2+的去除率降低至73.19%,而对Zn^2+、Cd^2+的去除率降至48.18%和38.84%。富集系数与吸附特征反应的结果一致,并且吸附符合Langmuir方程和Freundlich方程。研究结果表明凹凸棒石可用于水体和土壤重金属污染的修复。Attapulgite is a natural clay mineral with large specific surface and strong adsorption ability.The given paper is aimed to make an exploration of adsorption characteristics of attapulgite on the heavy metal ion Zn^2+,Cu^2+and Cd^2+,the adsorption capacity,removal rate,adsorption selectivity and enrichment coefficients of heavy metal ions Zn^2+,Cu^2+and Cd^2+by using attapulgite were studied through the adsorption isotherm experiment.The results show that the adsorption capacity of attapulgite to Cu^2+,Zn^2+and Cd^2+increased with the increase of the initial concentration of the solution,and the characteristics of adsorption selection are Cu^2+>Zn^2+>Cd^2+.The removal rate of Cu^2+by attapulgite was 97.40%,Zn^2+and Cd^2+by was 96.76%and 96.22%,respectively,when the initial concentration of attapulgite was 20 mg/L.When the concentration increased to 300 mg/L,the removal rate of Cu^2+decreased to 73.19%,the removal rate of Zn^2+and Cd^2+decreased to 48.18%and 38.84%.The enrichment coefficient is consistent with the result of adsorption characteristic,and the adsorption accords with Langmuir and Freundlich equations.The results show that attapulgite can be used for remediation of heavy metal pollution in water and soil.

关 键 词：凹凸棒石 吸附特征 重金属离子 富集系数 

分 类 号：X53[环境科学与工程—环境工程]