Semiconductor heterogeneous photocatalysis opens the possibility to decompose organic and inorganic wastes friendly to environment with the help of solar irradiation.  However, relatively low efficiency and slow overall rates are actual barriers to practical applications of this method.  To improve the performance of semiconductor photocatalysis, development of novel photocatalyst harvesting a large portion of solar spectrum and with higher efficiency has been of vital interest recently. Doping, especially non-metal doping has been confirmed to be an efficient method to extend the activity of photocatalysts to the visible light region.  The visible-light activity of so-called “self-doped” TiO₂ has also been recognized widely. These works make it more possible to apply semiconductor photocatalysis as an advanced oxidation technology (AOT) in the near future.