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Various photocatalytic systems have been reported for degradation of harmful air pollutants. Most of the reported catalysts are based on well-known semiconducting material, titanium dioxide (TiO 2 ), while some are based on other materials such as silicon dioxide (SiO 2 ), various zeolites. However, titania based systems are very popular in this regard and the most of the photocatalytic...
Rutile-TiO 2 , obtained by treatment of Degussa P25 at T=800°C in oxygen, is used as a starting material and initially shows only marginal optical absorption and photocatalytic activity in the visible range. Treatment at temperatures T≥1000°C in a hydrogen atmosphere leads to the phase transformation: rutile-TiO 2 →Ti n O 2n−1 (n<9). Subsequent treatment at T=800°C...
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