绿泥石对U(VI)的吸附特征研究

Study on sorption of chlorite to uranium(VI)

以绿泥石为研究对象,利用静态吸附的方法,探究了吸附时间、U(VI)初始浓度、固液比、pH值、离子类型等对U(VI)吸附效果的影响.并讨论了U(VI)在绿泥石上的吸附动力学行为.结果表明:准二级动力学模型可以用来描述U(VI)在绿泥石上的吸附;绿泥石对U(VI)的吸附20 h即趋于稳定;最佳吸附固液附比为1∶150;最佳吸附初始浓度为20μg·mL^(-1);当pH为7时,吸附效果最好.过酸或过碱都会影响绿泥石对U(VI)的吸附;溶液中Ca^(2+)、HCO_3^-、CO_3^(2-)、SO_4^(2-)、Mg^(2+)对U(VI)的吸附有较强的抑制作用.

In this paper, employing the static adsorption methods, we explored the effects of adsorption time, U(VI) initial concentration, solid liquid ratio, pH value, ion type, temperature and other factors on the adsorption of U(VI) by chlorite. The adsorption kinetics of U(VI) in chlorite is discussed. The results show that the quasi-secondary dynamics model can be used to describe the adsorption of uranium on chlorite;The adsorption rate of chlorite on U(VI) is relatively fast, and the adsorption of 20 h is stable;The optimal solid-liquid adsorption ratio is 1∶150;The optimal initial concentration is 20 μg·mL^-1;The best adsorption effect can be obtained when pH is 7. The acid or alkaloid will affect the adsorption of chlorite on U(VI);Ca ^2+, HCO ^3 -, CO3 ^2-, SO4 ^2-, Mg ^2+ in the solution have inhibitory effect on the adsorption of U(VI).