▎ 摘　　要

To improve the solar utilization efficiency of TiO2, the graphene-TiO2 and Ag(Au)/graphene-TiO2 composite photocatalysts were prepared by solvothermal reduction and photoreduction deposition technique, respectively. The phase structure, morphology, porosity, optical absorption property as well as composition and structure of as-prepared materials were characterized. The results indicated that TiO2 interacts with graphene via Ti-O-C covalent bonds and Ag or Au nano-particles evenly deposite on the graphene and TiO2 surface. The photocatalytic activity and degradation kinetics of the as-prepared photocatalysts were studied by the degradation of aqueous rhodamine B and methyl orange under solar simulating Xe lamp irradiation. The results indicated that the composite photocatalysts exhibit higher photocatalytic activity compared with pure TiO2 due to enhanced quantum efficiency, narrowed band gap, and perfect textural properties.