By using Fe3O4@SiO2@TiO2 as the carrier,methyl parathion(MP)as the template molecule,methacrylic acid(MAA) and 4-vinylpyridine(4-VP) as the functional monomer,and ethyleneglycol dimethacrylate(EGDMA) as the crosslinking agent,the magnetic molecularly imprinted composite photocatalyst(TiO2-MPIPs) was prepared by surface polymerization method,and studied its characterization and photocatalytic properties.The results shown that when the ratio of n(MP)∶n(MAA+4-VP)∶n(EGDMA) was 1∶8∶18,and the amount of Fe3O4@SiO2@TiO2 modified by ethylene was 33mg,the photocatalytic performance was the best.TiO2-MPIPs had good specific recognition and photocatalytic degradation of the template molecule MP and quickly reached the adsorption equilibrium within 45 minutes with the maximum adsorption capacity at 44.5mg/g and the degradation rate of MP at 96.8% after 70 minutes' UV irradiation.TiO2-MPIPs selectivity coefficient of photocatalytic degradation for MP was 2.73 as compared to that with dimethoate,3.10 times and 2.55 times that of the magnetic non molecularly imprinted composite photocatalyst (TiO2-NIPs) and the carrier (Fe3O4@SiO2@TiO2) respectively.
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