三氯乙酸阴离子表面印迹材料的制备及其识别特性  

Preparation and Recognition Character of Trichloroacetic Acid Anion Surface-Imprinted Material

作　　者：张婷婷[1] 高保娇[1] 李晓静[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《功能高分子学报》2013年第3期259-267,共9页Journal of Functional Polymers

基　　金：国家青年基金项目(20110210215)

摘　　要：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,制得表面键合有氨基的改性硅胶微粒AMPS-SiO2。在水溶液体系中,凭借静电相互作用,三氯乙酸(TCAA)阴离子与阳离子单体丙烯酰氧乙基三甲基氯化铵(DAC)相结合;溶液中的过硫酸盐与改性微粒AMPS-SiO2表面的氨基构成氧化还原引发体系,在硅胶微粒表面产生自由基,使DAC及交联剂N,N′-亚甲基双丙烯酰胺(MBA)在硅胶微粒表面的接枝交联聚合与TCAA阴离子的表面印迹同步进行;洗脱模板离子后,制得了TCAA阴离子表面印迹材料IIP-PDAC/SiO2。以化学结构与TCAA十分相似的一氯乙酸(MCAA)为对比物,采用静态结合、动态结合及竞争性吸附等实验方法,深入考察研究了阴离子表面印迹材料IIP-PDAC/SiO2对TCAA阴离子的识别与结合性能。研究结果表明,TCAA阴离子表面印迹材料IIP-PDAC/SiO2对TCAA具有良好的的识别选择性与结合亲和性,相对于MCAA阴离子,IIP-PDAC/SiO2对TCAA阴离子的识别选择性系数为3.612。Micron-sized silica gel particles were surface-modified with coupling agent γ-aminopropyltrimethoxysilane （AMPS）, and the modified particles AMPS-SiO2 bonded with amino groups were obtained. In aqueous solution, trichloroacetic acid （TCAA） anions combined with cationic monomer acryloxyethyltrimethyl ammonium chloride （DAC） by right of electrostatic interaction. A redox initiating system was constructed by the amino groups on AMPS-SiO2 and ammonium persulphate in the solution, and free radicals were produced on the surfaces of silica gel particles. These free radicals initiated the crosslinking copolymerization of the monomer DAC and the crosslinker N,N＇-methylene bisacrylamide （MBA） to be synchronously carried out with the surface-imprinting of TCAA. After removing the template ions, TCAA anion surface-imprinted material IIP-PDAC/SiO2 was obtained. The molecular structure of monochloroacetic acid （MCAA） is very similar to that of TCAA, so MCAA anion was selected as contrast ion. Both static and dynamic combination experiments and the competing sorption experiment were performed to study the binding properties and ion recognition character of IIP-PDAC/SiO2 for TCAA anion. Results show that IIP PDAC/SiO2 has fine recognition selectivity and binding affinity for TCAA anion, and its selectivitycoefficient for TCAA anion with respect to MCAA anion is 3. 612.

关 键 词：表面引发 接枝聚合 静电相互作用 离子表面印迹 三氯乙酸 离子识别 

分 类 号：O631[理学—高分子化学]