(427b) Synthesis of P25 Doped CoFe2O4/Graphene Magnetic Catalyst and Its High-Performance Photocatalytic Activities Under Visible Light Irradiation

With a facile one step hydrothermal method, a novel magnetically separable P25/CoFe2O4/Graphene photocatalysts have been fabricated in a mild condition. A systematic investigations on improving the photocatalytic activity of the catalysts was made via a strategy of locating P25 on CoFe2O4/Graphene suface. Transmission Electron Microscopy (TEM) indicated that the P25 and CoFe2O4 nanoparticles are well-dispersed and successfully anchored on the graphene sheet surface. X-ray diffraction (XRD), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) further suggested the similar results. After adsorption equilibrium, the photocatalytic activities were evaluated in terms of the photodegradation among various dyes, such as methylene blue(MB), methyl orange(MO) and neutral dark yellow(GL) in aqueous solution under visible-light irradiation. Amazingly, the as-prepared P25/CoFe2O4/Graphene nanocomposites exhibited much higher photocatalytic activities than the CoFe2O4/Graphene composites. The miraculous improvement of such photocatalytic properties might be attributed to the remarkable synergistic effects and the superior characteristics of graphene. Furthermore, the P25/CoFe2O4/Graphene nanocomposites provided a magnetically separable ability, which could be recovered in a suspension system by an applied magnetic field, solving the difficulty of recyclable use.