同时脱除吡虫啉和啶虫脒农残的虚拟模板表面分子印迹的制备和应用

以吡虫啉和啶虫脒的结构类似物烟酰胺作为虚拟模板分子、α-甲基丙烯酸(α-methyl acrylic acid,MAA)作为功能单体、乙二醇二甲基丙烯酸酯(ethyleneglycol dimethacrylate,EDGMA)作为交联剂,采用表面分子印迹技术(MIT)制备了虚拟模板表面分子印迹聚合物(dummy template surface molelecularly imprinted polymers,DMIP)。在单因素实验的基础上采用响应面优化法对DMIP的制备方法进行优化,利用扫描电子显微镜对优化后的DMIP形态结构进行表征,考察了DMIP对于吡虫啉和啶虫脒的吸附性能。结果表明,DMIP对吡虫啉和啶虫脒具有较高的吸附容量和选择性,对吡虫啉和啶虫脒的最大吸附量分别为41.73和21.95 mg/g。将DMIP作为柱填充材料从茶多酚中脱除吡虫啉和啶虫脒,去除率分别达到96.2%和95.6%。所得DMIP对茶多酚等天然植物提取物生产过程中吡虫啉和啶虫脒的去除具有良好的应用前景。

Synthesis of molecularly imprinted polymers of virtual template surface andits application on simultaneously remove imidacloprid and acetamiprid

Dummy template surface molecularly imprinted polymers(DMIP)were prepared by using nicotinamide,nonpoisonous imidacloprid and acetamiprid structural analogue as dummy template molecule,α-methyl acrylic acid(MAA)as functional monomer,and ethylene glycol dimethacrylate(EGDMA)as the cross-linking agent.On the basis of single-factor experiment,response surface method was used to optimize the preparation of DMIP.The morphology of the optimized DMIP was characterized by scanning electron microscopy(SEM),and the adsorption properties of DMIP for imidacloprid and acetamiprid were studied.The results showed that the optimized DMIP exhibited high adsorption capacity and selectivity for imidacloprid and acetamiprid.The maximum adsorption capacity of DMIP for imidacloprid and acetamiprid was 41.73 mg/g and 21.95 mg/g,respectively.The removal efficiency of imidacloprid and acetamiprid from tea polyphenols was 96.2%and 95.6%,respectively.The obtained DMIP exhibit a good application prospect for the removal of imidacloprid and acetamiprid in the production process of tea polyphenols and other extracts.