以吡虫啉为模板分子,丙烯酸(AA)为功能单体,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,甲醇为溶剂,悬浮聚合法制备吡虫啉分子印迹聚合物。采用正交分析确定优化合成配方为吡虫啉2 mmol,EDGMA 50mmol,甲醇150 mL,偶氮二异丁腈(AIBN)0.05 g,AA 8 mmol,此时聚合物有较大的饱和吸附量和加标回收率,分别为361 mg/g和94.6%。Scatchard分析表明,所得分子印迹聚合物存在2种不同的结合位点;与非印迹聚合物的吸附性能比较表明,该聚合物对吡虫啉有较好的特异性吸附能力。

Molecular imprinted polymers( MIPs) for imidacloprid were prepared by suspension polymerization method,in which acrylic acid( AA) was used as a functional monomer,and ethylene glycol dimethacrylate( EGDMA) was used as a crosslinker in methanol. The effects of template molecule,regarding the functional monomer molar ratio,dosage of crosslinkers and solvents on the morphology and adsorption properties were investigated. The optimized formula was obtained by an orthogonal test L 9( 33) as follows: imidacloprid 2 mmol,EGDMA 50 mmol,methanol 150 mL,AIBN 0. 05 g,AA 8 mmol. The results showed that the polymer has largest adsorption capacity( 361 mg / g) and recovery ratio( 94. 6%). Scatchard analysis showed that there were two kinds of sorption active sites in MIPs,and the binding capacity( Q max) and dissociation contents( K d) were Q max1 = 188. 29 mg / g,K d1 = 16. 42 mg / L and Q max2 = 610. 08 mg / g,K d2 = 714. 29 mg / L respectively. The molecular imprinted polymers exhibited a good selectivity and a large adsorption capacity compared to the imidacloprid materials.