Synthesis and Photocatalytic Property of TiO2/Graphene-Fe3O4 Magnetic Ternary Composite Photocatalyst

Graphene oxide was prepared as raw material by an improved Hummers method. Then graphene-Fe3O4 magnetic carrier was obtained by a co-precipitation method, and finally TiO2/graphene-Fe3O4 magnetic tertiary composite photocatalyst was synthesized by a hydrothermal method. The properties of products were characterized by XRD, SEM, and UV-Vis DRS. Photocatalytic activity and stability of the resulting catalyst was evaluated by the degradation of methylene blue solution under visible and UV light. Results show that the degradation reaction accords with the first-order kinetic model. The composite catalyst has better photocatalytic activity than pure TiO2 in the UV and visible light. As a support and an electron acceptor; graphene enhances the band edge absorption of TiO2 in the visible light region, so it can effectively increase the photocatalytic activity of TiO2, At the same time magnetic Fe3O4 is added to improve its recyclability.