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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。
In this paper, Fe3O4 @ SiO2 nanoparticles modified with 3- (methacryloyloxy) propyltrimethoxysilane (MPS) were reported as magnetic carriers and DEHP as a template (MAA) as the functional monomer and ethylene glycol dimethacrylate (EGDMA) as the crosslinking agent, new magnetic molecularly imprinted polymers (M-MIPs) with specific recognition to DEHP were prepared. Transmission electron microscopy (TEM) images show that the polymer has a core-shell structure, and magnetometer (VSM) measurements show that the polymer has superparamagnetism, which allows for rapid separation under external magnetic fields. Static equilibrium adsorption experiments and Scatchard analysis showed that there are two kinds of binding sites for the polymer with equilibrium dissociation constants of 0.26 mmol / L and 0.071 mmol / L, respectively. The maximum apparent binding capacities were 28.23 mg / g and 13.09 mg / g. Selective binding experiments show that M-MIPs have superior recognition ability and selectivity to template molecules compared to structural analogues. The polymer prepared by the method can be further used for the separation and enrichment of DEHP in food.