邻苯二甲酸二(2-乙基己基)酯磁性分子印迹聚合物的制备及吸附特性研究

本文报道了以3-(异丁烯酰氧)丙基三甲氧基硅烷(MPS)修饰的Fe3O4@SiO2纳米颗粒为磁性载体,邻苯二甲酸二(2-乙基己基)酯(DEHP)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(EGDMA)为交联剂,制备了对DEHP有特异识别性的新型磁性分子印迹聚合物(M-MIPs)。透射电镜(TEM)图表明该聚合物具有核壳结构,磁强计(VSM)测量表明该聚合物具有超顺磁性,这些特征使之在外磁场下可实现快速分离。静态平衡吸附实验和Scatchard分析结果表明,该聚合物存在两类不同的结合位点,平衡解离常数分别为0.26mmol/L和0.071mmol/L,最大表观结合量分别为28.23mg/g和13.09mg/g。选择性结合实验表明,与结构类似物相比,M-MIPs对模板分子具有优越的识别能力和选择性。该方法制备的聚合物可进一步用于食品中DEHP的分离和富集。

Preparation and Adsorption Characteristic of Magnetic Molecular Imprinted Polymers for Di(2-ethylhexyl) Phthalate

Novel magnetic molecularly imprinted polymers (M-MIPs) with specific recognition were prepared using Fe3O4@SiO2 modified by 3-(trimethoxysilyl)propylmethacrylate (MPS) as magnetic carrier, di(2-ethylhexyl) phthalate(DEHP) template molecule, methacrylic acid (MAA) as functional monomer, and ethylene glycol dimethyl acrylate (EGDMA) as cross-linker. TEM graph reveals the M-MIPs owned a core-shell structure. VSM measurement manifests the M-MIPs were superparamagnetic, this feature provided the M-MIPs with easy separation in an external magnetic field. The static equilibrium adsorption experiment and the Scatchard analysis showed that there were two kinds of binding sites between the imprinted polymers and template molecule. The dissociation constants were 0.26 mmol/L and 0.071 mmol/L, and the corresponding apparent maximum number were 28.23 mg/g and 13.09 mg/g. selective experiment showed the M-MIPs exhibited excellent recognition and selection properties toward template molecule, compared with its analogues The as-prepared M-MIPs could be further employed for the separation and enrichment of DEHP from food.