TiO2 considered a promising semiconductor for many reasons, stable and unsolvable in water, safe and non toxic material, with v.good structural and mechanical properties make it suitable in different applications.
TiO2 is by far the most widely studied transition oxide semiconductor for photochemical and photoelectrochemical applications. Thus it has become a sort of common model for research. It is a relatively abundant and stable material, with more a relatively good deal of resistance to photocorrosion than that of other commonly studied oxides. However, the larger band gap of conventional unmodified anatase TiO2 (3.2 eV) makes it less economical for practical visible light applications. On a longer run, research is required for visible light active semiconductor oxides that possess the same stability and versatility of TiO2.
Recently, perovskite-type transition metal oxides (TMOs) have been proposed as promising photocatalysts for wastewater and air pollution treatments. Some perovskite-type TMOs are semiconductors with a band gap narrow enough for efficient absorption of visible light, and thus can potentially be employed as visible-light-active photocatalysts. In this case they offer a strong advantage over TiO2, namely the use of solar radiation or of less energy-consuming visible-light lamps, and hence the development of effective, cheap and ecocompatible technologies.
In addition to the mentioned advantageous, TiO2 stable in acid so it dosen`t dissolve. Moreover, becuase of its electronic configuration its efficiency in adsorbing light is higher that discatering light.
TiO2 is more effective because of its characteristics. Comparing to other semiconductor powders, TiO2 has maximum quantum yields due to high photocatalytic activity, photo-corrosion resistance, and low cost and toxicity.
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