双模板铅离子印迹吸附剂的制备及其应用于环境水及沉积物样品中铅的选择性吸附  

Preparation of Pb^(2+) Double-template Imprinted Sorbent for Selective Separation of Pb^(2+) from Environmental Water and Sediment Samples

作　　者：谢发之[1] 宣寒[1] 葛业君[1] 王颖[1] 曹田[1] 张克华[1] 

机构地区：[1]安徽建筑工业学院材料与化学工程学院,合肥230022

出　　处：《分析化学》2011年第1期77-81,共5页Chinese Journal of Analytical Chemistry

基　　金：安徽省高校省级优秀青年人才基金(No.2010SQRL089)项目资助

摘　　要：利用溶胶-凝胶法制备了一种双模板介孔Pb2+印迹吸附剂(Pb-CTMAB-imp)。通过平衡吸附实验,研究了Pb-CTMAB-imp的吸附性能和对Pb2+的选择识别性能。结果表明,Cd2+存在时,Pb-CTMAB-imp对Pb2+的选择系数可以达到91,远高于只用十六烷基三甲基溴化铵(CTMAB)作为模板的印迹吸附剂(CTMAB-imp)的0.40。Pb-CTMAB-imp对Pb2+的相对选择系数为228,而CTMAB-imp仅为9.35。Pb-CTMAB-imp对Pb2+的吸附容量和选择吸附能力均高于未使用CTMAB时Pb2+单模板印迹吸附剂(Pb-imp)。Pb2+在Pb-CT-MAB-imp的吸附可以用Langmiur等温吸附方程描述,理论吸附容量可达0.222mmol/g。制备的Pb-CTMAB-imp在5min内吸附率可达到95%,且重复使用性能良好。应用于标准水系沉积物样品和环境水样中Pb2+的分离与富集结果满意。A double-template imprinted sorbent was prepared by a sol-gel imprinting approach for the selective separation of Pb^2 ＋ from environmental water and sediment samples.The adsorption property and selective recognition ability of the sorbents were studied by equilibrium-adsorption method.Results showed that in the presence of Cd^2 ＋,the selectivity coefficient and the relative selectivity coefficient of the double-template imprinted sorbents for Pb^2 ＋ was 91 and 228,respectively,which is much higher than those of CTMAB-imp sorbents（0.4 and 9.35）.The uptake capacities and the selectivity coefficients of the double-template imprinted sorbent were much higher than those of the sorbent prepared without CTMAB template.The extraction behavior of the matrix was conformed by Langmuir＇s equation.Theoretical sorption capacity was 0.222 mmol/g.Furthermore,the new imprinted sorbent possessed a fast kinetics for the removal of Pb^2 ＋ from aqueous solution with the saturation time less than 5 min and could be repeatedly used.This sorbent has been successfully applied to the separation and determination of the trace Pb^2 ＋ in standard reference sediment materials and real water samples.

关 键 词：双模板 印迹吸附剂 十六烷基三甲基溴化铵 铅 选择性吸附 

分 类 号：X832[环境科学与工程—环境工程]