Facile synthesis of the Ti 3+ self-doped TiO 2 -graphene nanosheet composites with enhanced photocatalysis

This study developed a facile approach for preparing Ti 3+ self-doped TiO 2 -graphene photocatalyst by a one-step vacuum activation technology involved a relative lower temperature, which could be activated by the visible light owing to the synergistic effect among Ti 3+ doping, some new intersurface bonds generation and graphene oxide reduction. Compared with the traditional methods, the vacuum activation involves a low temperature and low-costing, which can achieve the reduction of GO, the self doping of Ti 3+ in TiO 2 and the loading of TiO 2 nanoparticles on GR surface at the same time. These resulting TiO 2 -graphene composites show the high photodegradation rate of MO, high hydrogen evolution activity and excellent IPCE in the visible light irradiation. The facile vacuum activation method can provide an effective and practical approach to improve the performance of TiO 2 -graphene and other metal oxides-graphene towards their practical photocatalytic applications.