This
paper summarizes recent research dealing with development
of titanium dioxide (TiO2) used for environmental applications.
TiO2 plays the most important role owing to its excellent
chemical and physical properties. However, the TiO2 band
edge lies in the UV region that makes them inactive under visible
irradiation. In this regard, considerable efforts have been made to
increase the visible light activity of TiO2 via the modification
of its electronic and optical properties. Doping TiO2 using
either anions or cations is one of the typical approaches that has
been largely applied. Coupling TiO2 with a narrow bad gap
semiconductor (M
x
O
y
/TiO2 or M
x
S
y
/TiO2) represents another approach. This
work aims to encompass the new progress of TiO2 for an
efficient application in water and wastewater treatment under visible
light, emphasizes the future trends of TiO2 in the environment,
and suggests new research directions, including preparation aspects
for the development of this promising material.
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