β-环糊精交联磁性壳聚糖对U(Ⅵ)的吸附性能及机制研究  

Adsorption Properties and Mechanism of U(Ⅵ) Onto β-Cyclodextrin Cross-Linked Magnetic Chitosan

作　　者：邹晓亮[1] 王劲松[1] 莫辉艳[1] 彭瑞婷[1] 皮艾南[1] 贾亮[1] 

机构地区：[1]南华大学城市建设学院,湖南衡阳421001

出　　处：《原子能科学技术》2013年第4期540-545,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(21177053)

摘　　要：利用接枝共聚的方法制备了β-环糊精交联磁性壳聚糖,并将其用于吸附水溶液中的U(Ⅵ),考察了溶液初始pH、吸附时间、温度等因素对U(Ⅵ)去除率的影响。吸附实验结果表明:β-环糊精交联磁性壳聚糖对U(Ⅵ)的吸附平衡时间为60min;温度越低,吸附剂投加量越大;溶液初始pH在3.0～6.0的弱酸性范围内有利于β-环糊精交联磁性壳聚糖对U(Ⅵ)的吸附。解吸实验结果表明,β-环糊精交联磁性壳聚糖经5次解吸后对U(Ⅵ)的吸附去除率仅下降7.41%。SEM表明,β-环糊精交联磁性壳聚糖表面粗糙。IR分析显示,β-环糊精交联磁性壳聚糖表面的—OH、—NH2是U(Ⅵ)结合的主要位点,吸附U(Ⅵ)后并未明显改变原有结构。A β-cyclodextrin cross-linked magnetic chitosan, prepared by the method of graft copolymer, was used to adsorb U（Ⅵ） from aqueous solution. The effects of initial solution pH, adsorption time, temperature and other factors on U（Ⅵ） removal rate by β-eyelodextrin cross-linked magnetic ehitosan were studied. The adsorption experimental results show that the adsorption equilibrium time of U （Ⅵ） onto β-cyclodextrin cross- linked magnetic chitosan is 60 min, and low temperature and high adsorbent dosage are beneficial for the adsorption. The optimum pH for the adsorption ranges from 3.0 to 6.0. The desorption experimental results show that the U（Ⅵ） adsorption removal rate is reduced by only 7. 41% after desorption of U（VI） in the β-cyclodextrin cross-linkedmagnetic chitosan for 5 times. SEM results show that the surface of β-cyclodextrin cross-linked magnetic chitosan is rough. Furthermore, the IR analysis shows that the --OH and --NH2 are the main binding sites on surface of β-cyclodextrin cross-linked magnetic chitosan, and its original structure has no significant change after adsorption of U（VI）.

关 键 词：β-环糊精交联磁性壳聚糖 吸附 U(Ⅵ) 

分 类 号：X703.1[环境科学与工程—环境工程] TB383[一般工业技术—材料科学与工程]