▎ 摘　　要

In this work, graphene oxide (GO) was prepared from natural flake graphite by the modified Hummers method. A series of composites consisting of rutile TiO2 and graphene (rGO-TiO2) were synthesized via a one-step hydrothermal reaction of graphene oxide and titanium isopropylate. The influence of the amount of graphene oxide on the photocatalytic activity of the rGO-TiO2 composites was studied. The photocatalysts were characterized by Brunauer-Emmett-Teller sorption (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, UV-Vis absorbance spectroscopy, and photoluminescence (PL) spectroscopy. The as-formed TiO2 was formed in the rutile phase with a needle-cluster structure, and dispersed uniformly on the surface of graphene sheets. The composites possess higher specific areas than pure rutile TiO2. The photo-degradation performance of Rhodamine B and methyl orange by the rGO-TiO2 composites under ultraviolet and visible light was studied. The results indicated that rGO-TiO2 composites prepared with 0.5 mg.mL(-1) of graphene oxide had the greatest photocatalytic activity.