Abstract: The magnetic imprinted N-doped P25/Fe3O4-graphene oxide (MIGNT) was prepared with methyl orange as the dummy template and pyrrole as functional monomer for catalytic degradation of Congo red (CR). Hummers method and hydrothermal method were used to synthesize Fe3O4-GO and N-doped P25, respectively. The results of adsorption and degradation experiments showed that the adsorption capacity and catalytic degradation ability of the imprinted composite for CR were obviously higher than those of non-imprinted one. Moreover, the effect factors on degradation efficiency of CR, such as the initial concentration of CR, catalysis time, pH of the solution and temperature were investigated. The MIGNT was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, physical property measurement system and thermal gravimetric analyzer. The degradation products of CR were detected with high performance liquid chromatography and mass spectrometer. The MIGNT was a bran-new imprinted composite and had high degradation efficiency for CR under dark ambient condition. The MIGNT could recycle in convenience, due to its magnetic property. The MIGNT could be used as an effective, environmental friendly and low-cost catalytic degradation material for the treatment of water contaminated by CR.
Author keywords: Catalytic degradation, Congo Red, dark ambient condition, Imprinted, Magnetic property