▎ 摘　　要

Nowadays, graphene is considered one important achievement as a consequence of its high potential in nanotechnologyand in the development of new environmental and energy processes. Reciently, graphene is receiving great attention in the area of photocatalysis, where is emerging in the next generation of photocatalysts, as a tool for enhancing photocatalytic performance and solar photoefficiency. Titanium dioxide hybridization with graphene has an effect on band gap energy decrease, shifting its absorption threshold to the visible light region and allowing to harness solar energy. So, the conjugation of graphene with semiconductor solid particles such as TiO2, results in photocatalysts with improved charge separation, reduced recombination of the photogenerated electron-hole pairs, increased specific surface area, and introduces an adequate quantity and quality of adsorption sites, given that enhances their electronic, optoelectronic, electrocatalytic and photocatalytic properties. This critical review sumarizes the recent progress in the design and synthesis of graphene-based titania semiconductor photocatalysts. Moreover, their applications in wastewater treatments, disinfection and air pollution control have been also discussed. Finally, some perspectives and challenges considered essential to extend the photoefficiency of these new photocatalysts in the visible region, to harvest directly solar light, have been suggested to introduce and elucidate new improvements in environmental photocatalytic processes. (C) 2017 Elsevier B.V. All rights reserved.