【摘要】 实验研究硅胶对硝酸体系中Zr、Pu(Ⅳ)的静态吸附和动态吸附行为。在1.0-4.0 mol/L HNO3中,硅胶对Zr的静态吸附容量(以干硅胶计)约为20 mg/g,对Pu(Ⅳ)的吸附分配系数为0.7-1.4 mL/g。随着料液酸度的降低,硅胶对Zr、Pu的吸附增加。动态吸附实验结果表明,进料酸度为2.0 mol/LHNO3时,硅胶吸附柱的工作容量约为3.5倍柱体积。使用2 mol/L HNO3淋洗液可将吸附Zr、Pu后的硅胶柱中的部分Zr、Pu洗脱,但洗脱不完全。用2倍柱体积的0.2 mol/L H2C2O4可将硅胶吸附的Zr、Pu解吸下来。硅胶柱用0.2 mol/L H2C2O4解吸后复用6次,Zr的穿透曲线位置相同。更多还原

【Abstract】 The static and dynamic adsorption behaviors of zirconium and plutooium(Ⅳ) on silica gel were studied.In 1.0-4.0 mol/L HNO3 solution,the static capacity of Zr on silica gel is about 20 mg/g,and the adsorption distribution coefficient of Pu(Ⅳ) is 0.7-1.4 mL/g. The adsorption of Zr and Pu increases with the decrease of aqueous acidity. The results of dynamic adsorption show that the effective capacity of dynamic adsorption for silica gel column is 3.5 times of bed volume.Zr and Pu absorbed in column can be partly eluted by 2 mol/L HNO3.0.2 mol/L H2C2O4 can be used to elute Zr and Pu completely.The silica gel column eluted by 0.2 mol/L H2C2O4 can be reused six times and the position of dynamic adsorption curve of each time is the same.更多还原