Preparation of reduced graphene oxide@Ag₂O modified TiO₂-based composites and their visible light photocatalytic properties

The reduced graphene oxide@Ag₂O co-modified TiO₂-based composites (rGO@Ag₂O/TiO₂) were successfully synthesized, whose photocatalytic performance under visible light irradiation were also tested. The ternary rGO@Ag₂O/TiO₂ composites show much higher visible light photocatalytic activity than the pure TiO₂ and rGO/TiO₂, Ag₂O/TiO₂ binary composites, of which almost 100% Rhodamine B (RhB) molecules were decomposed by the rGO@Ag₂O/TiO₂ composites after 120 min visible light irradiation. Due to the introduction of the narrow gap semiconductor Ag₂O and the admirable electron conductivity rGO, so the rGO@Ag₂O/TiO₂ ternary composites have strong visible light absorption ability and potent separation of electron-holes pairs, the ternary rGO@Ag₂O/TiO₂ composites show much higher visible light photocatalytic activity.