UO_2^(2+)在Ca型石灰性土壤上的吸附行为  

Study of UO_2^(2+) Sorption Onto Ca-Calcareous Soil

作　　者：张昱莹[1] 范桥辉[1] 王耀芹[1] 许江[1] 牛智伟[1] 吴王锁[1] 许君政[1] 

机构地区：[1]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《原子能科学技术》2011年第6期651-656,共6页Atomic Energy Science and Technology

基　　金：国家自然科学人才培养基金资助项目(J0630962);国家自然科学基金资助项目(20871062);2010年度教育部博士研究生学术新人奖项目资助

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。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.

关 键 词：石灰性土壤 UO22+ 吸附 解吸 富里酸 

分 类 号：O647.32[理学—物理化学]