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.