采用静态批式法对UO2^2+在Ca型石灰性土壤上的吸附行为进行了研究,考察了接触时间、固液比、pH和富里酸(FA)对UO2^2+在Ca型石灰性土壤上吸附和解吸的影响。研究结果表明,UO2^2+在Ca型石灰性土壤上的吸附在约5 h内可达吸附平衡,且符合准二级动力学模型。UO22+在Ca型石灰性土壤上的吸附为不可逆过程;但当FA浓度增至10 mg/L时,UO2^2+在土壤表面的解吸作用明显增强。
In order to investigate the sorption behavior of UO2+2 on Ca-calcareous soil,the batch technique was performed to study the effects of contact time,solid-to-liquid ratio,pH,and fulvic acid(FA) on the sorption of UO2+2.The results indicate that UO2+2 sorption on Ca-calcareous soil can achieve equilibrium in a very short time,and the sorption process accords with the pseudo-second-order kinetic model.The sorption process of UO2+2 on Ca-calcareous soil is an irreversible process;however the desorption is significantly enhanced when the concentration of FA increases to 10 mg/L.