久效磷磁性分子印迹聚合物的合成表征及其性能研究

Preparation and characterization of monoerotophos magnetic molecular imprinted polymers

以3一（异丁烯酰氧）丙基三甲氧基硅烷修饰的Fe3O4为磁性组分，久效磷为模板分子，甲基丙烯酸为功能单体，乙二醇二甲基丙烯酸酯为交联剂，制备了久效磷磁性分子印迹聚合物，并用红外光谱、扫描电镜和X射线衍射对其表征分析。静态吸附平衡结合实验和Scatchard分析表明，该久效磷磁性印迹聚合物有两类结合位点，对久效磷的吸附量为68．81μmol／g；比较苏灭磷和磷胺的结合性能，磁性印迹聚合物对久效磷的分离因子分别为3．87和6．23，表明该印迹聚合物对久效磷有较高的选择性和吸附性。将该磁性印迹聚合物应用于土壤中久效磷的分离富集，用磁铁将其与溶液快速分离，用高效液相色谱测定，样品回收率为75．4％～108．0％，相对标准偏差为2．8％～5．8％。

Novel magnetic molecular imprinted polymers（M-MIPs）were prepared using 3-（trimethoxysilyl）propyl methacrylate modified FeaO4 nanoparticles as the magnetical susceptible component, monocrotophos as the template mole- cules, methacrylic acid as the functional monomer and ethylene glycol dimethacrylat as the crosslinking agent. The products were characterized by Fourier transform infrared analysis, SEM and XRD analysis. The static adsorption equilibrium expert ments and Scatchard analysis showed that there were two kinds of binding sites in the polymers and the adsorption capacity was 68. 81μmol/g. Compared with the recognition of M-MIPs for Mevinphos and Phosphamidon, the corresponding separa- tion factors for monocrotophos were 3.87 and 6.23 respectively,which indicated that the M-MIPs exhibited better adsorp- tion properties and selectivity for monocrotophos. The M-MIPs were applied to separate monocrotophos from the soil sam- ple and were easily separated from the sample matrix by an adscititious magnet. The analytes eluted from the polymers were determined by high liquid chromatography spectrometry. The recoveries obtained to be 75. 4% to 108. 0% with relative standard deviations in the range of 2.8-5.8%.