硅胶表面AuCl4-印迹聚乙烯亚胺的制备及识别特性研究

摘要

A functional graft material PEI-g-SiO2 was prepared via grafting functional polymer PEI (polyethyleneimine, PEI) onto the surface of silica gel particles. Then, PEI macromolecules grafted onto the surface of silica gel particles were crosslinked to produce ionic imprinted material IIP-PEI-g-SiO2by using AuCl4- as template ions and ethylene glycol diglycidyl ether (EGDE) as the crosslinking agent. The adsorption ability of IIP-PEI-g-SiO2 for AuCl4- was investigated through the static method. The experiment results showed that the ionic imprinted material IIP-PEI-g-SiO2displayed excellent adsorption performance and great ability of recognition memory for AuCl4-. The adsorption capacity could be up to 23.59 mg/g, and the relative selectivity coefficients relative to Cu2+ was 32.45. Furthermore, IIP-PEI-g-SiO2 also possessed an excellent reusability.%将功能高分子聚乙烯亚胺(polyethyleneimine，PEI)化学接枝在硅胶微粒表面，形成功能接枝材料PEI-g-SiO2；再以AuCl4-为模板离子，乙二醇二缩水甘油醚(EGDE)为交联剂，将接枝在硅胶表面的PEI大分子链进行交联，同时实施AuCl4-的印迹，制备了AuCl4-印迹材料IIP-PEI-g-SiO2。采用静态法考察了IIP-PEI-g-SiO2对AuCl4-的吸附特性。实验结果表明，IIP-PEI-g-SiO2对AuCl4-具有优良的吸附性能与较强的记忆识别能力。吸附容量可以达到23.59 mg/g，相对于Cu2+，印迹材料对AuCl4-的选择性系数为32.45。此外，IIP-PEI-g-SiO2还具有优良的重复使用性能。