A novel Fe2O3-Fe3O4@SiO2@TiO2-TNS-GR magnetic composite with an enhanced visible photocatalytic property

A novel magnetic Fe2O3-Fe3O4@SiO2@TiO2-TNS-GR had been synthesized via a solvothermal method. The XRD diffraction patterns and SEM images showed that the magnetite Fe2O3-Fe3O4 core was coated with amorphous SiO2 sheel and anatase sheel successively. TiO2 nanosheets (TNS) and Fe2O3-Fe3O4@SiO2@TiO2 had been loaded on the graphene (GR) sheets successfully. The degradation rate of Fe2O3-Fe3O4@SiO2@TiO2-TNS-GR for rhodamine B (RhB) under visible light irradiation reached 93.34%, which was much higher than that of Fe3O4@SiO2-TNS-GR. The Fe3O4 made the composite to be easily separated from the suspension with an external magnetic field, and alpha-Fe2O3 had enhanced the photocatalytic activity of the composite.