Preparation of Nano-titanium Dioxide/Graphene Composites and the Enhanced Photocatalytic Performance

Nano-titanium dioxide/graphene composites were prepared by a facile hydrothermal method for the enhanced photocatalytic applications.The samples were characterized and analyzed by means of XRD,UV-Vis SEM and EDS.With methylene blue （MB） as the target degradation material,the photocatalytic effect of nano-TiO₂/graphene composites was evaluated.It was shown that the composite material was well crystallized,the band gap was small,and had a good photocatalytic performance under visible light.The results showed that hydrothermal time,hydrothermal temperature,and content of graphene oxide had influence on the photocatalytic properties of the composite. The photocatalytic activity of the sample increased with the increase of hydrothermal time and content of graphene oxide,and increased first and then decreased with the increase of water temperature.The nano-TiO₂/graphene composites showed the best photocatalytic activity with the hydrothermal time of 10 h,temperature of 120 ℃ and graphene content of 5%,and the degradation rate of composite powder for methylene blue was up to 86.99% within 5 h.