离子印迹磁性壳聚糖微球对铀离子的吸附特性  

Adsorption Properties for Uranium(VI)Ions Using Ion-Imprinted Magnetic Chitosan Microspheres

作　　者：尚超[1] 周利民[1,2] 

机构地区：[1]核资源与环境省部共建国家重点实验室培育基地(东华理工大学),江西南昌330013 [2]天津大学化工学院,天津300072

出　　处：《高分子材料科学与工程》2013年第1期56-59,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(21166001);江西省教育厅科技项目(GJJ12380)

摘　　要：以U(VI)为模板,利用印迹-交联技术制备具有良好吸附性能的离子印迹磁性壳聚糖微球(IMCR)。IMCR粒径为10μm^35μm,磁化强度为29.7 emu/g,对U(VI)吸附最佳pH为5.0,随温度升高,U(VI)吸附容量下降。吸附符合拟二级动力学,且为自发放热过程。吸附等温线符合Langmuir模型,为单分子层吸附。由Dubinin-Radushkevich模型计算的E>8 kJ/mol,表明为化学吸附。IMCR对U(VI)最大吸附容量为187.3 mg/g,高于非印迹树脂(NIMCR 160.8 mg/g),并且有更好的选择性。吸附后的IMCR可用0.5 mol/L EDTA溶液洗脱再生。The ion-imprinted magnetic chitosan resins （IMCR） prepared using uranium [ U （VI） ] as a template have the diameter of 10μm-35μm and the magnetic strength of 29.7emu/g. The optimum pH value for U （VI） adsorption onto IMCR was pH 5.0, and U（VI） adsorption capacity decreased with the temperature increasing. The adsorption process was spontaneous and exothermic, following the second-order kinetics. Equilibrium isotherms were well-fitted with Langmuir isotherm equation for the monolayer adsorption. The E values （〉 8 kJ/mol） calculated from Dubinin-Radushkevich model indicate that the adsorption of the U （VI） ions is predominant on the chemisorptions process. The maximum adsorption capacity value 187.3 mg/g for IMCR is higher than that for un- imprinted resins （NIMCR160.8 mg/g）. Moreover, the higher selectivity for U（VI）was also observed for IMCR. The regeneration of IMCR could be achieved using 0.5 mol/L ethylenediaminetetraaeetic acid solution for adsorbing U（VI） again.

关 键 词：离子印迹树脂 壳聚糖 磁性吸附 U(VI) 

分 类 号：TQ424.3[化学工程]