TiO2/graphene porous composite and its photocatalytic degradation of methylene blue

Abstract

TiO2/graphene porous composites with reduced graphene oxide (rGO) as its inner surface were prepared based on graphene microspheres colloidal crystals template. The structure and morphology of TiO2/graphene porous composites were characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM). With rGO sheets as the interface of the porous TiO2/graphene, the composites exhibited high light absorbing capacity, high adsorption ability for methylene blue (MB) and fast charge transportation and separation ability. TiO2/graphene porous composites showed superior activity in the degradation of MB under visible light. The rate constant of TiO2/graphene porous composite was 0.0208min−1, which was almost 6.5 times higher than P25 under the visible-light-driven radiation.