分子印迹技术改性壳聚糖吸附废水中钴(Ⅱ)  

Adsorption of Cobalt(Ⅱ) in Waste Water with Chitosan Modified by Molecular Imprinting Technique

作　　者：徐文峰[1] 

机构地区：[1]重庆文理学院化学与环境工程系,永川402160

出　　处：《理化检验（化学分册）》2010年第7期829-831,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：重庆市教育委员会科技研究项目(KJ081205;KJ091213);重庆文理学院项目资助金重点项目(Z2007HH11)

摘　　要：采用分子印迹技术对壳聚糖进行化学处理，制备出钴（Ⅱ）模板壳聚糖吸附剂。吸附试验结果表明：对于钴（Ⅱ）质量浓度≤350mg·L^-1的废水，当钴（Ⅱ）模板壳聚糖用量为8g·L^-1，吸附温度70℃，吸附时间25min，pH为6．0～6．5时，吸附容量最佳。在该条件下钴（Ⅱ）模板壳聚糖对含钴（Ⅱ）废水中钴（Ⅱ）的饱和吸附容量33．27mg·g^-1，比壳聚糖对钴（Ⅱ）的饱和吸附容量提高了17．92％。采用原子吸收光谱法测定钴。方法用于2件工业废水样品的分析，钴（Ⅱ）的加标回收率为99．0％和100．0％，测定值的相对标准偏差（n=6）为1．1％～1．4％。Cobalt （Ⅱ）-template chitosan adsorbant was prepared by modifying chitosan with molecular imprinting technique. The modified chitosan obtained was tested for its capacity for adsorption of Co（ Ⅱ ） ion from waste water. It was shown that when 8 g· L^-1 of the modified chitosan were used for adsorption of Co（ Ⅱ ） ion in amounts 4350 mg·L^-1 from a medium containing waste water at the pH values from 6. 0 to 6. 5 under the temperature of 70℃ for 25 min, the saturated adsorption capacity attained to a value of 33. 27 mg · g^-1, which is 17. 92% higher than that of the un-modified chitosan. The determination of cobalt（ Ⅱ ） was performed by atomic absorption spectrometry. The proposed method was applied to the analysis of industrial waste water, values of recovery found were 99. 0% and 100. 0%, and values of RSD＇s （n=6） were in the range of 1. 1%--1. 4%.

关 键 词：吸附 钴(Ⅱ)离子 废水 壳聚糖 钴(Ⅱ)离子模板壳聚糖 分子印迹技术 

分 类 号：O647.3[理学—物理化学]