In this study, we present the synthesis and characterization
of reduced graphene oxide–TiO2 (RGO–TiO2) nanocomposites
derived from commercial P25 and graphene oxide (GO) via a
facile hydrothermal reaction with minor modification. The results
showed that the RGO–TiO2 nanocomposites are able to exhibit a
high surface area, excellent structure, great electrical and optical
properties. Their photocatalytic activities for the degradation
of Rh.B were higher than that of a commercial P25 as a benchmark
photocatalyst under UV and visible light irradiation. The
visible light response of RGO–TiO2 nanocomposites can be significantly
ascribed to in the presence of Ti–O–C bond by compared
with mechanical mixture of graphene-P25 (Gr-P25). The influence
of RGO on the photocatalytic activity of RGO–TiO2 nanocomposites
has been examined systematically by considering the different
weight addition ratios of graphene. It is found that the superfluous
graphene in RGO–TiO2 nanocomposites leads to a decreased photocatalytic
activity, the features are similar to CNT–TiO2 composite.