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