Abstract: Graphene oxide (GO) obtained from coal-based graphite by the Hummers method was hydrothermally treated to obtain reduced GO (rGO). TiO₂ was mixed with aqueous suspensions of GO and rGO and dried at 70 ^oC to obtain GO-TiO₂ and rGO-TiO₂ with 95% (mass fraction) TiO₂. TiO₂ was also combined with a GO suspension by hydrothermal treatment to obtain rGO-hTiO₂ with 95% TiO₂. The three hybrids were used as catalysts for the photocatalytic degradation of rhodamine B (Rh B) and methyl orange (MO). Of the three materials, rGO-hTiO₂ had the highest catalytic activity for the degradation of Rh B and MO under visible light irradiation. The reasons for having the best catalytic activity are that the incorporation of rGO into TiO₂ helps increase its adsorption capacities for Rh B and MO as evidenced by adsorption in dark, and a narrowing of the TiO₂ band gap as revealed by diffuse UV reflectance spectroscopy. This reduces the rate of recombination of electron–hole pairs by there being intimate contact between the TiO₂ particles and rGO, forming Ti-O-C bonds as confirmed by XPS, with the TiO₂ particles being uniformly decorated on the rGO sheets.