磁性金属有机框架表面分子印迹的制备及富集蔬菜样品中2,4-二氯苯氧乙酸的应用

以固相研磨法制备的磁性金属有机框架为基质，2, 4-二氯苯酚为傀儡模板分子，3-氨基丙基三乙氧基硅烷为功能单体，在室温下通过溶胶-凝胶法制备了磁性分子印迹材料Fe₃O₄@ZIF-MIP. 使用X射线衍射、红外光谱、扫描电镜、透射电镜和氮气吸附对分子印迹材料进行了表征. 当2, 4-苯氧乙酸的质量浓度为500 μg/mL时，Fe₃O₄@ZIF-MIP的吸附容量为120.31 mg/g，印迹因子为3.64，材料重复使用6次后性能保持在95%以上，所建立的方法适用于蔬菜中低含量2, 4-二氯苯氧乙酸含量的富集.

Preparation of Molecular Imprinting on Surface of Magnetic Metal-Organic Framework and Application of Enrichment of 2, 4-Dichlorophenoxyacetic Acid in Vegetables Samples

The magnetic molecular-imprinted material Fe₃O₄@ZIF-MIP was prepared by a sol-gel method at room temperature with magnetic metal-organic frameworks as the matrixes, 2, 4-dichlophenol as the pseudotemplate molecule and 3-aminopropyltriethoxysilane as the functional monomer. The molecular-imprinted materials were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption. The adsorption capacity of Fe₃O₄@ZIF-MIP was 120.31 mg/g at a concentration of 500 μg/mL of 2, 4-phenoxyacetic acid, and the blotting factor was 3.64, the properties of the material remained above 95% after repeated use for 6 times, and the established method is suitable for the enrichment of low content 2, 4-dichlorophenoxyacetic acid in vegetables.