吡蚜酮分子印迹聚合物的制备及吸附性能表征

Study on preparation and adsorption properties of pymetrozine molecularly imprinted polymers

以吡蚜酮为模板分子,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,采用本体聚合法制备了吡蚜酮分子印迹聚合物。实验优化了模板分子与功能单体的摩尔比,通过吸附动力学和等温吸附实验对聚合物的吸附性能进行了表征,利用拟二级动力学模型和Scatchard分析研究了聚合物对目标物的吸附行为。实验结果表明:模板分子与功能单体摩尔比为1∶4时,制备的吡蚜酮分子印迹聚合物具有较好的印迹效果,最优条件下聚合物的吸附容量为25.11mg/g,印迹因子为3.0,可在80min内达到吸附平衡(20mg/L);聚合物对目标物的吸附行为符合拟二级动力学模型(R2=0.999),Scatchard分析结果表明聚合物在聚合过程中形成了较为明显的印迹位点,对目标物呈现一致的亲和力。

A molecular imprinted polymer was prepared by bulk polymerization using pymetrozine as template, methylacrylic acid as monomer, azo-bio （isobutryonitrile）as initiator, ethylene glycol dimethacrylate as cross- linker.The molar ratio of template to monomer was optimized and the synthesized molecular imprinted polymer was characterized by isothermal adsorptions test and adsorption kinetics. The results indicated that the molecular imprinted polymer was 3.0 times of adsorption capacity than that of non- imprinted polymers, and could reach adsorption equilibrium within 80min at 20mg/L concentration.The adsorption behavior was studied using pseudo- second-order kinetic model （R^2 = 0.999）and scatchard analysis and the results showed that the adsorption behavior abeyed pseudo-second-order kinetic model and the polymers with specific imprinted site formed during imprinting proceedings possess the same binding with the targets.