UO<SUB>2</SUB><sup>2+</sup>在Ca型石灰性土壤上的吸附行为

UO₂²⁺在Ca型石灰性土壤上的吸附行为

摘要: 采用静态批式法对UO₂²⁺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UO₂²⁺在Ca型石灰性土壤上吸附和解吸的影响。研究结果表明，UO₂²⁺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，UO₂²⁺在土壤表面的解吸作用明显增强。

Abstract: In order to investigate the sorption behavior of UO₂²⁺ 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 UO₂²⁺. The results indicate that UO₂²⁺ 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 UO₂²⁺ on Ca-calcareous soil is an irreversible process; however the desorption is significantly enhanced when the concentration of FA increases to 10 mg/L.