接枝壳聚糖对铅、镉吸附行为研究及应用  

Study on adsorption properties of carboxyl-containing grafted chitosan polymer toward Pb(Ⅱ) and Cd(Ⅱ) and its application

作　　者：侯明[1] 刘振国[2] 

机构地区：[1]成都理工大学,成都610059 [2]桂林工学院,桂林541004

出　　处：《分析试验室》2006年第10期1-6,共6页Chinese Journal of Analysis Laboratory

基　　金：广西自然科学基金(桂科自0342047);广西教育厅科研项目(桂教科研[2003]22号)资助项目

摘　　要：在碱性条件下，用环氧氯丙烷交联制备水不溶性交联壳聚糖（CCTS），将丙烯腈单体接枝到CCTS分子骨架上制得接枝壳聚糖（CTCA）。研究了CTCA对水中Pb^2＋、Cd^2＋的吸附富集行为和洗脱行为，用原子吸收光谱法测定。结果表明，溶液的pH值为6．0时，Pb^2＋、Cd^2＋的吸附率达94％和95％，吸附容量分别达到56．6mg／g、47．0mg／g。用1mol／L HCl洗脱，Pb^2＋、Cd^2＋的解吸率均可达97％。方法的检出限为：Pb^2＋，0．065μg／L；Cd^2＋，0．024μg／L。对10mg／L的Pb^2＋、Cd^2＋溶液进行分离富集和测定，其相对标准偏差为3．4％和5．2％。方法已用于天然水中Pb^2＋、Cd^2＋的分离富集和测定，其回收率：Pb^2＋，94％～101．9％；Cd^2＋，95．6％～108％。Carboxyl-containing grafted chitosan polymer （CTCA） was obtained by grafting acrylonitrile onto the crosslinked-chitosan. The properties of adsorption and desorption of Pb^2＋ , Cd^2＋ on CTCA was studied with the atomic absorption spectroscopy. The results showed that adsorption efficiencies for Pb^2＋ , Cd^2＋ were 94% and 95% at pH 6.0, and 1 mol/L HCl was sufficient for complete elution. The adsorption capacity of CTCA for Pb^2＋ , Cd^2＋ was 56.6 and 47.0 mg/g respectively. The detection limit of this method for Pb^2＋ 、 Cd^2＋ was 0. 065 and 0. 024 μg/L, and relative standard deviation was 3.4 % and 5.2 % （ n = 11 ） for Pb^2＋ , Cd^2＋. The method has been applied suceessfully to the determination of trace lead and cadmium in water samples with reeoveies of 94% ～ 101.9% for Pb^2＋ , 95.6% ～ 108% for Cd^2＋.

关 键 词：铅 镉 接枝壳聚糖 吸附行为 原子吸收分光光度法 

分 类 号：O657.1[理学—分析化学]