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本文使用了有机-无机杂化的方法制备了对甲基对硫磷具有特异性识别能力的纳米二氧化硅表面分子印迹材料。该方法使用丙烯酰胺作为功能性单体,KH-570硅烷作偶联剂,甲基对硫磷作为模板剂,以氨基修饰的纳米二氧化硅作为载体在氯仿溶液中进行表面的分子印迹嫁接。通过溶剂与功能性单体的作用,氨丙基功能性单体不仅能选择性地在硅材料表面发生聚合,还能作为一种辅助性地单体驱使模板剂进入到已形成的壳层结构中,从而产生有效的特异性识别位点。制备出的MIPs-Si O2纳米颗粒具有三维的核壳结构以及大的比表面积。分子印迹后的壳层结构为甲基对硫磷分子提供了丰富的识别位点,使其对模板剂具有强的选择性吸附能力。以MIPs-Si O2纳米颗粒作为一种固相分散萃取吸附剂的载体,可以选择性地萃取梨子及其他绿色蔬菜的样品中微量的甲基对硫磷,并且能够获得84.7~94.4%的回收率。
In this paper, organic-inorganic hybrid methods have been used to prepare nano-silica surface molecularly imprinted materials with specific recognition ability for methyl parathion. The method uses acrylamide as functional monomer, KH-570 silane as coupling agent, methyl parathion as templating agent and amino-modified nano-silica as carrier in surface molecular grafting in chloroform solution. Through the action of the solvent and the functional monomer, the aminopropyl functional monomer can not only selectively polymerize on the surface of the silicon material, but can also serve as an auxiliary monomer to drive the templating agent into the formed shell structure In order to produce efficient specific recognition sites. The prepared MIPs-Si O2 nanoparticles have a three-dimensional core-shell structure and a large specific surface area. The molecularly imprinted shell structure provides a rich site of recognition for the methyl parathion molecule and provides a strong selective adsorption of the template agent. Using MIPs-Si O2 nanoparticles as a carrier for solid-phase dispersion extraction sorbents, trace amounts of methyl parathion in the samples of pears and other green vegetables can be selectively extracted and recoveries of 84.7-94.4% can be obtained .