高性能铬酸根阴离子表面印迹材料的制备及其离子识别与结合特性  

Preparation of chromate anion surface-imprinted material with high performance and its ion recognition and combination character

作　　者：李晓静[1] 高保娇[1] 张婷婷[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《环境化学》2014年第3期485-493,共9页Environmental Chemistry

基　　金：山西省自然科学基金资助项目(201002100843)资助

摘　　要：采用表面引发接枝聚合法,首先实施了单体甲基丙烯酸二甲基氨基乙酯(DMAEMA,含叔胺基团的单体)在硅胶微粒表面的接枝聚合,制得接枝微粒PDMAEMA/SiO2;然后以环氧氯丙烷为试剂,使接枝的大分子PDMAEMA发生季铵化反应,实现了接枝微粒的季铵化(Quaternization)转变,制得了功能微粒QPDMAEMA/SiO2;考察了该功能微粒对CrO2-4阴离子的强吸附作用.在此基础上,采用本课题组建立的新型离子表面印迹技术,以CrO2-4阴离子为模板离子,己二胺为交联剂,对功能微粒表面的大分子链QPDMAEMA/SiO2进行了离子印迹,制备了CrO2-4离子表面印迹材料IIP-QPDMAEMA/SiO2,深入研究了其离子识别与结合特性.实验结果表明,该离子表面印迹材料对CrO2-4阴离子具有特异的识别选择性与优良的结合亲和性,相对于NO-3和HPO2-4离子,印迹材料IIP-QPDMAEMA/SiO2对CrO2-4离子的识别选择性系数高达8.39和10.02,显示出很高的离子识别能力.The graft-polymerization of a ternaryamino-containing monomer, dimethylaminoethyl methacrylate （DMAEMA） was carried out via surface-initiated graft-polymerization, and the grafted particles PDMAEMA/SiO2 were obtained. Subsequently, the grafted macromolecule PDMAEMA on the grafted particles PDMAEMA/SiO2 was quaternized with epichlorohydrin as reagent, and the quaternization transform of the grafted particles was realized, resulting in the functional particles QPDMAEMA/SiO2. The adsorption property of the functional particles towards CrO42- anion was examined. On this basis, the ion imprinting towards the functional macromolecules QPDMAEMA was conducted with CrO42- anion as template ion and hexamethylenediamine as crosslinker by using a novel ionic surface-imprinting technique, and CrO42- anion surface-imprinted material IIP-QPDMAEMA/SiO2 was prepared. The ion recognition and combination characters of IIP-QPDMAEMA/SiO2 particles were examined and investigated in deepth. The experimental results show that this chromate anion surface-imprinted material IIP-QPDMAEMA/SiO2 has excellent recognition selectivity and combination affinity for the template CrO42- anion. Compared to the two contrast anions, NO3- and HPO42- anions, the coefficients of selectivity of IIP-QPDMAEMA/SiO2 for CrO42- anion reach up to 8.39 and 10.02, respectively, displaying its very high ion recognition ability.

关 键 词：铬酸根离子 离子表面印迹 表面引发接枝聚合 甲基丙烯酸二甲基氨基乙酯 季铵化反应 离子识别 

分 类 号：O631.3[理学—高分子化学]