农药氯氰菊酯的分子印迹聚合物的合成及其结合性能研究

为了制备特异性强、吸附效果好的分析材料，本实验采用分子印迹技术，以农药氯氰菊酯为模板分子，甲基丙烯酸 (MAA) 为功能单体，乙二醇二甲基丙烯酸酯 (EDMA) 为交联剂，合成了对氯氰菊酯具有高度选择性的分子印迹聚合物(MIP)。通过平衡吸附实验，评价了其对氯氰菊酯的亲和力和选择性。结果表明，与空白MIP相比，氯氰菊酯MIP对其表现出较高的亲和力。Scatchard 分析表明，在MIP中存在对氯氰菊酯有不同亲和力的两类作用位点，其中高亲和力结合位点的离解常数Kd为3.604×10-4mol/L，最大表观吸附量Qmax为53.045μmol/g，低亲和力结合位点的离解常数Kd为1.8015×10-3mol/L，最大表观吸附量为116.61μmol/g。氯氰菊酯MIP上有两个不同性质的结合位点，它对模板分子氯氰菊酯具有一定的选择性和识别能力。

Synthesis and Adsorption Characteristics of Cypermethrin-imprinted Polymer

A cypermethrin-imprinted polymer (CIP) with high selectivity was developed by using molecular imprinting technique with methacrylic acid as functional monomer and ethylene glycoldimethacrylate as crosslinker. The selectivity and affinity of CIP were evaluated by adsorption equilibrium experiments. Results showed that cypermethrin-imprinted polymer exhibits higher affinity to cypermethrin compared to non-imprinted polymer. Scatchard analysis indicated that two recognition sites exist in cypermethrin-imprinted polymer molecular. The Kd (dissociation constant) and Qmax (maximum apparent adsorption quantity) of the site with higher affinity are 3.604×10-4 mol/L and 53.045 μmol/g, respectively, while those of the site with lower affinity are 1.8015×10-3 mol/L and 116.61 μmol/g, respectively. These results in this study showed that the cypermethrin-imprinted polymer is able to recognize and selectively absorb cypermethrin.