Visibl light-active TiO2-reduced graphene oxide photocatalysts were prepared using simple mechanical mixing of titanium dioxide with different amounts of rGO (0.1, 0.5, 1.0 and 2.0 wt.%) in the presence of 1-butyl alcohol. Structures and morphologies of the samples were examined by means of FTIR/DRS, UV-vis/DR, XRD, SEM, TEM and Raman spectroscopy. The photocatalytic properties were checked on the basis of acetic acid photooxidation (the steady rate of linear increase of the CO2 yield was used for the estimation of photocatalytic activity). The maximum photodegradation rate was observed for TiO2 decorated with 0.5 wt.% of rGO. The enhancement of photodegradation efficiency should be related to pi-conjugation system, two-dimensional planar structure and efficient charge separation of reduced graphene oxide nanosheets. (C) 2016 Elsevier B.V. All rights reserved.