磁性胺肟基功能化CMC对铀酰离子的吸附行为研究  

Poly( amidoxime) / carboxymethylated cellulose magnetic composite: characterization and adsorption behavior for uranyl

作　　者：高阳阳[1] 袁亚莉[1] 胡建邦[1] 马丹丹[1] 李玉慧[1] 徐文慧[1] 

机构地区：[1]南华大学化学化工学院,湖南衡阳421001

出　　处：《应用化工》2014年第3期427-431,434,共6页Applied Chemical Industry

基　　金：湖南省自然科学基金资助项目(12JJ6014)

摘　　要：采用两步法合成磁性胺肟基功能化CMC(简称PAO/CMC/Fe3O4),用批示法研究了PAO/CMC/Fe3O4对U(VI)的吸附行为,考察了pH值、吸附时间、吸附剂用量等对吸附效果的影响。结果表明,PAO/CMC/Fe3O4对U(VI)的吸附容量大,速度快,最大吸附容量119.21 mg/g,30 min左右达到吸附平衡,平衡数据符合Langmuir等温方程,符合伪二阶动力学吸附模型,说明PAO/CMC/Fe3O4对U(VI)的化学吸附过程是速率控制步骤。Magnetic functional composite of polyamidoxime （PAO）-grafted magnetic carboxymethylated cellulose （CMC/Fe3O4） was prepared by two-step method.The adsorptive features of PAO/CMC/Fe3O4 for UO22＋ with respect to pH,adsorbent dose,contact time were investigated using batch sorption techniques.The results showed that the maximum adsorption capacity of the magnetic composite toward U（Ⅵ） was 119.21 mg/g.Equilibrium data were well described by the Langmuir sorption isotherm.Suitable adsorption kinetics was found,and the process followed pseudo-second-order reversible kinetics,indicating that the rate controlling step was chemical adsorption.

关 键 词：磁性 CMC 吸附 铀酰离子 

分 类 号：TQ028.15[化学工程] TQ039.2