METHOD OF PREPARING PHOTOCATALYTIC TITANIUM DIOXIDE Russian patent published in 2008 - IPC C01G23/53 B01J21/06 B01J37/26 

FIELD: light-sensitive catalysts.

SUBSTANCE: invention is directed to preparation of titanium dioxide-based catalysts for photocatalytic treatment of water and air polluted with organics and pathogenic floras. Invention provides a method comprising preparation of reaction solution containing mineral titanium salt, fluoride ion, and activation additive; hydrolysis of mineral titanium salt to form precipitate; washing and calcination of the precipitate. Activation additive utilized is ammonium hydroxide in 5-10% stoichiometric excess. Hydrolysis is conducted for 0.25-0.5 h at pH 10-13, while concentration of fluoride ion in reaction solution is maintained at least 5 wt % based on TiO₂. Mineral titanium salt is selected from titanium tetrachloride, titanyl sulfate, and titanium-ammonium chloride.

EFFECT: increased degree of recovering titanium dioxide into target product, increased heat resistance and specific surface of photocatalytic anatase-modification titanium, and reduced process duration.

6 cl, 1 tbl, 14 ex