| Summary: | TiO<sub>2</sub> probably plays the most important role in photocatalysis due to its excellent chemical and physical properties. However, the band gap of TiO<sub>2</sub> corresponds to the Ultraviolet (UV) region, which is inactive under visible irradiation. At present, TiO<sub>2</sub> has become activated in the visible light region by metal and nonmetal doping and the fabrication of composites. Recently, nano-TiO<sub>2</sub> has attracted much attention due to its characteristics of larger specific surface area and more exposed surface active sites. nano-TiO<sub>2</sub> has been obtained in many morphologies such as ultrathin nanosheets, nanotubes, and hollow nanospheres. This work focuses on the application of nano-TiO<sub>2</sub> in efficient environmental photocatalysis such as hydrogen production, dye degradation, CO<sub>2</sub> degradation, and nitrogen fixation, and discusses the methods to improve the activity of nano-TiO<sub>2</sub> in the future.
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