▎ 摘　　要

An one-step hydrothermol method was developed to synthesize TiO2/Graphene composites (TiO2/GR) by employing graphene oxide and tetra-n-butyl titanate. The factors affecting the photocatalytic activity of TiO2/GR were studied by using orthogonal design, and the optimum conditions are: reaction temperature 180 degrees C, reaction time 16 h and pH value 3.0. TiO2/GR was characterized on crystal structure, particle size, morphology and specific surface area by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and BET analysis. The results show that the TiO2 in composites is anatase and the average diameter is about 18 nm. The BET specific surface area of the TiO2/GR is 170 m(2)/g and the average pore diameter is 12.45 nm. Under visible light (lambda > 420 nm), the photodegradation of RhB by TiO2/GR indicates that the best photocatalytic activities is observed with TiO2/GR, compared to P25 and bare TiO2 obtained by the same conditions.