pH、离子强度、时间和温度对Cd(Ⅱ)在伊利石上吸附的影响  

Effects of pH,Ionic Strength,Time and Temperature on the Sorption of Cd(Ⅱ) to Illite

作　　者：刘霞[1] 陈元涛[1] 胡君[2] 张炜[1] 池亚玲[1] 郭智军[1] 肖江[1] 

机构地区：[1]青海师范大学化学系,青海西宁810008 [2]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《核化学与放射化学》2012年第6期358-363,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(20967006;21107115)

摘　　要：用批量平衡法研究了pH值、离子强度、反应时间和温度对Cd(Ⅱ)在伊利石上吸附的影响。并用Lagrange准二级动力学方程、Langmuir等温线方程、Freundlich等温线方程以及D-R等温线方程对实验数据进行拟合。结果表明:pH值和离子强度对Cd(Ⅱ)在伊利石上的吸附均有明显的影响,低pH值下Cd(Ⅱ)在伊利石上的吸附主要是通过外层络合和离子交换;而在高pH值下Cd(Ⅱ)的吸附主要是通过内层络合作用进行;Cd(Ⅱ)在伊利石上的吸附动力学符合Lagrange准二级动力学方程;热力学符合Langmuir等温线方程;升高温度有利于Cd(Ⅱ)在伊利石上的吸附。The sorption of Cd（ Ⅱ） on illite was studied as a function of pH, ionic strength, time and temperature under ambient conditions using batch technique. The results indicate that sorption of Cd（ Ⅱ ） on illite is strongly dependent on pH values and ionic strength. At low pH, the sorption is dominated by outer-sphere surface complexation and ion exchange on illite surfaces, whereas inner-sphere surface complexation is the main sorption mechanism at high pH. The adsorption of Cd（Ⅱ ） on illite is found to follow pseudo-second-order kinetic model well. Sorption of Cd（ Ⅱ ） increase with increasing temperature and fit the Langmuir isotherm well.

关 键 词：伊利石 吸附 Cd(Ⅱ) 

分 类 号：TL942.1[核科学技术—辐射防护及环境保护]