ABSTRACT
Because of its unique electrical properties, high surface area, and high adsorption capacities, graphene has been found to be an amazing nanocarrier of guest molecules such as TiO2 [1-5]. Hybridization of titania with two-dimensional carbon nanomaterial inuences the enhancement of its photocatalytic activity. The electronic interaction between graphene and titanium dioxide has an effect on the excited electrons transferring from the conduction band of TiO2 to the surface of graphene, hence improving the separation of the electron-hole pairs, preventing their recombination, and improving the photocatalytic efciency [3,6,7]. Furthermore, TiO2 conjugation with graphene inuences its band gap energy decrease, thus shifting the absorption threshold to the visible light region and allowing utilization of solar energy [8]. In this chapter, the methods used for the preparation of titanium dioxide-graphene photocatalysts, proposed mechanisms of graphene effect on the photocatalytic activity of TiO2, and applications of these composites on the photocatalytic degradation of pollutants, hydrogen generation, solar cells production, and others are reviewed.
