PHOTOCATALYTIC ACTIVITY OF TITANIUM-OXIDE PREPARED BY LIQUID-PHASE DEPOSITION (LPD)

Titanium oxide powder and thin films were prepared from an (NH4)(2)TiF 6 aqueous solution upon addition of boric acid in a process denoted as liquid phase deposition (LPD). In this process, titanium oxide powder and films were formed by the chemical equilibrium reaction between ti tanium fluoro-complex ions and metal oxide in the aqueous solution. Th e prepared powder and deposited films showed some features which diffe red from titanium oxide prepared from titanium alkoxide. The prepared powder and the deposited films included anatase (TiO2) and showed phot ocatalytic activity without prior calcination. The decomposition rate of CH3CHO reached a maximum when the powder or films were calcined at 300 degrees C. The LPD process enabled a uniform layer of TiO2 film to form homogeneously on the entire surface of glass wool. The prepared TiO2 contained fluorine and nitrogen. The amount of these impurities w as reduced upon calcination.