▎ 摘　　要

We have developed a facile and efficient one-pot synthesis of nanocomposites of magnetic separable Graphene Polyaniline-Ferrite (G@PANI-Fe3O4) and Graphene Polypyrrole-Ferrite (G@PPy-Fe3O4) for the use of photocatalytic dye degradation of pollutants. This is the first attempt to synthesize PANI-Fe3O4 and PPy-Fe3O4 on graphene surface by a simple hydrothermal step, where PANI and PPy constructed nanocomposites with graphene and ferrite nanoparticles. The nitrogen-containing functional groups of PANI and PPy have provided more active sites on functionalized G@PANI-Fe3O4 and G@PPy-Fe3O4 nanocomposites for enhanced dye degradation capacity. The photocatalytic activity of as-prepared nanocomposites was investigated by the degradation of direct red 23. The effective degradation of direct red 23 up to 95.44% and 94.98% was observed by using the dose of 1 g/L G@PANI-Fe3O4 and G@PPy-Fe3O4 nanocomposite respectively, at pH 4 and contact time within 10 min only. The degradation capacity of G@PANI-Fe3O4 and G@PPy-Fe3O4 nanocomposite was superior in comparison with reported material and could be recycled at least 10 cycles. As-prepared nanocomposites were well characterized by X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA), Vibrating Sample Magnetometer (VSM) and Scanning Electron Microscope (SEM). The results demonstrated that the magnetically separable G@PANI-Fe3O4 and G@PPy-Fe3O4 nanocomposites are acting as an effective catalyst for dye degradation, which has effective recyclability property. The efficient dye degradation capacity of as-prepared nanomaterials could provide an innovative platform for different applications including the control of water pollution.