采用新型离子表面印迹材料在皮米尺度上对相邻稀土离子进行识别分离的研究  

Studies on Recognition and Separation of Neighbor Rare Earth Ions on Scale of Picometer Using Novel Surface Ion-Imprinted Material

作　　者：高学超[1] 高保娇[1] 牛庆媛[1] 赵婧[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《化学学报》2010年第11期1109-1118,共10页Acta Chimica Sinica

基　　金：山西省自然科学基金(No.2008021013)资助项目

摘　　要：将丙烯腈接枝聚合于硅胶微粒表面,然后将接枝的聚丙烯腈转化为聚偕胺肟(PAO),制得了功能接枝微粒PAO/SiO2.采用本课题组建立的新型分子表面印迹技术,以稀土钆离子为模板离子,戊二醛为交联剂,对接枝在硅胶表面的PAO大分子链进行了离子印迹(IIP),制备了钆离子表面印迹材料IIP-PAO/SiO2.以与钆元素相邻的稀土元素铕及钐的离子为对比物,采用静态与动态两种方法,考察研究了表面印迹材料IIP-PAO/SiO2对钆离子的结合性能与离子识别特性.研究结果表明,离子表面印迹材料IIP-PAO/SiO2对钆离子具有特异的识别选择性与优良的结合亲和性.相对于离子半径与其仅差1～3pm的相邻稀土离子铕离子及钐离子,IIP-PAO/SiO2对钆离子的识别选择性系数分别为7.49与7.93.此外,印迹材料IIP-PAO/SiO2还具有良好的洗脱性能,以稀盐酸溶液作为洗脱液,29个床体积内解吸率可达99.54%.Acrylonitrile （AN） was graft-polymerized on micron-sized silicon particles, resulting in grafted particles PAN/SiO2. Subsequently, the grafted PAN was converted to poly（amidoxime） （PAO） via amidoximation reaction, obtaining functional particles PAO/SiO2. Then, the ionic imprinting towards the grafted PAO was performed with Gd^3＋ ion as template ion and glutaral as crosslinking agent by using the novel surface-molecular imprinting technique established by our research group, and the Gd^3＋ ion-imprinted material IIP-PAO/SiO2 was prepared. Rare earth element Eu and Sm are adjacent to Gd in lanthanum elements, and the ionic radius difference between Eu^3＋ and Sm^3＋ ions and Gd^3＋ ion is only 1 -3 pm. In this work, with Eu^3＋ and Sm^3＋ ions as contrast substances, both static and dynamic methods were adopted to study the binding properties and ion recognition character of IIP-PAO/SiO2 for Gd^3＋ ion. The experiment results show that IIP-PAO/SiO2 have specific recognition selectivity and excellent binding affinity for Gd^3＋ ion, and the selectivity coefficients of IIP-PAO/SiO2 for Gd^3＋ ion with respect of Eu^3＋ ion and Sm^3＋ ion are 7.49 and 7.93, respectively. Besides, IIP-PAO/SiO2 has excellent elution property, with diluted HCl solution as eluent, the desorption ratios of Gd^3＋ ion reach 99.54% in 29 BV.

关 键 词：聚偕胺肟 硅胶 离子印迹 表面印迹 稀土离子 离子识别 

分 类 号：O614.33[理学—无机化学]