Adsorption behavior of Zr(IV) and Hf(IV) on a silica-based macroporous TODGA adsorbent  

作　　者：YIN Xiangbiao WEI Yuezhou ZU Jianhua 

机构地区：[1]School of Nuclear Science and Engineering, Shanghai Jiao Tong University

出　　处：《Nuclear Science and Techniques》2013年第4期9-16,共8页核技术（英文）

基　　金：Supported by National Natural Science Foundation of China(No.91126006,and 91226111)

摘　　要：In order to separate Zr(IV) and Hf(IV) in acidic solution,several kinds of silica-based macroporous adsorbents were synthesized.Their adsorption selectivity for Zr(IV) and Hf(IV) in HCl solution was investigated,and the TODGA adsorbent for the two elements had the largest adsorption difference.The effects of acid type,HCl concentration,and temperature on the adsorption behavior of Zr(IV) and Hf(IV) onto the TODGA adsorbent were conducted by batch experiments.It was found that H+exhibited a quite strong influence on adsorption capacity of Zr(IV) and Hf(IV).Isotherm fitting showed that the Langmuir model agrees well with the experimental data.The thermodynamic parameters indicate that the adsorption processes for both elements are endothermic reactions.The TODGA adsorbent had the higher adsorption selectivity for Zr(IV) over Hf(IV) and could be promising for their mutual separation.In order to separate Zr（IV） and Hf（IV） in acidic solution, several kinds of silica-based macroporous adsorbents were synthesized. Their adsorption selectivity for Zr（IV） and Hf（IV） in HCl solution was investigated, and the TODGA adsorbent for the two elements had the largest adsorption difference. The effects of acid type, HCl concentration, and temperature on the adsorption behavior of Zr（IV） and Hf（IV） onto the TODGA adsorbent were conducted by batch experiments. It was found that H＋ exhibited a quite strong influence on adsorption capacity of Zr（IV） and Hf（IV）. Isotherm fitting showed that the Langmuir model agrees well with the experimental data. The thermodynamic parameters indicate that the adsorption processes for both elements are endothermic reactions. The TODGA adsorbent had the higher adsorption selectivity for Zr（IV） over Hf（IV） and could be promising for their mutual separation.

关 键 词：大孔吸附剂 吸附行为 二氧化硅 LANGMUIR模型 锆 吸附选择性 铪 实验数据 

分 类 号：TL341[核科学技术—核技术及应用]