Adsorption characteristics of thorium on silica-based anion exchange resins  

作　　者：陈彦良 赵龙 韦悦周 何林锋 唐方东 

机构地区：[1]Nuclear Chemical Engineering Laboratory, School of Nuclear Science and Engineering,Shanghai Jiao Tong University [2]Division of Chemistry and Ionizing Radiation Measurement Technology,Shanghai Institute of Measurement and Testing Technology

出　　处：《Nuclear Science and Techniques》2015年第6期55-62,共8页核技术（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.91026019)

摘　　要：To isolate and separate thorium from nitric acid solutions, three silica-based anion exchange resins were synthesized. Batch experiments were carried out to investigate adsorption behavior of thorium in nitric acid solutions. Adsorption at different concentrations of nitric acid and thorium, influence of contact time and coexisting metal ions, and effect of NO3– were investigated in detail. It was found that at high HNO3 concentrations,the resins exhibited higher adsorption capacity and better affinity towards thorium. The adsorption kinetics could be described by the pseudo-second order model equation, while the adsorption isotherms were well correlated by the Langmuir model. The maximum capacity towards thorium species on SiPyR-N4 was evaluated at 27–28 mg/g-resin. The thermodynamic parameters indicated the adsorption was an exothermic reaction. The presence of NO3– was found to promote the retention of the thorium species.To isolate and separate thorium from nitric acid solutions, three silica-based anion exchange resins were synthesized. Batch experiments were carried out to investigate adsorption behavior of thorium in nitric acid solutions. Adsorption at different concentrations of nitric acid and thorium, influence of contact time and coexisting metal ions, and effect of NO3^– were investigated in detail. It was found that at high HNO_3 concentrations,the resins exhibited higher adsorption capacity and better affinity towards thorium. The adsorption kinetics could be described by the pseudo-second order model equation, while the adsorption isotherms were well correlated by the Langmuir model. The maximum capacity towards thorium species on SiPyR-N_4 was evaluated at 27–28 mg/g-resin. The thermodynamic parameters indicated the adsorption was an exothermic reaction. The presence of NO3^– was found to promote the retention of the thorium species.

关 键 词：阴离子交换树脂 二氧化硅基 吸附特性 硝酸钍 硝酸溶液 模型方程 吸附动力学 吸附等温线 

分 类 号：TQ425.23[化学工程]