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建立了一种新的离子表面印迹(IIP)方法.使用偶联剂γ-氨丙基三甲氧基硅烷(AMPS)对微米级硅胶微粒进行表面改性,制得表面含有氨基的改性硅胶AMPS-SiO2.凭借离子交换作用,阳离子单体甲基丙烯酰氧乙基三甲基氯化铵(DMC)结合在模板离子磷酸根周围;改性硅胶AMPS-SiO2表面的氨基与溶液中的过硫酸盐构成氧化还原引发体系,使DMC及交联剂N,N’-亚甲基双丙烯酰胺(MBA)在硅胶微粒表面发生接枝交联聚合,从而实现了磷酸根离子的表面印迹,制得了阴离子表面印迹材料IIP-PDMC/SiO2.采用静态与动态两种方法,考察研究了IIP-PDMC/SiO2对PO43-离子的识别特性与结合性能.研究结果表明,离子表面印迹材料IIP-PDMC/SiO2对PO43-离子具有特异的识别选择性与优良的结合亲和性,相对于对比离子高锰酸根离子,IIP-PDMC/SiO2对PO43-离子的识别选择性系数为9.58.
A new ionic surface imprinting (IIP) method was developed.Microspheres were modified with γ-aminopropyltrimethoxysilane (AMPS) -SiO2. By virtue of ion exchange, the cationic monomer methacryloyloxyethyltrimethylammonium chloride (DMC) binds around the template ionophosphate; the amino group on the surface of the modified silica gel AMPS-SiO2 and the persulfate in the solution Salt redox initiator system DMC and cross-linking agent N, N’-methylene-bis-acrylamide (MBA) graft polymerization occurs on the surface of the silica particles to achieve the surface of phosphate ions imprinted, prepared IIP-PDMC / SiO2, an anionic surface imprinting material, has been studied by static and dynamic methods.The results show that IIP-PDMC / SiO2 The specific recognition selectivity and excellent binding affinity for PO43- ions are 9.58 for the identification of PO43- ions by IIP-PDMC / SiO2 relative to the comparative ion permanganate ions.