![]() On Pt/TiO 2, formic acid decomposes to CO 2 and H 2 during PCD. On TiO 2, the hole oxidizes formic acid, sometimes completely to CO 2 and H 2O in the presence of oxygen (photocatalytic oxidation, PCO), or it decomposes formic acid to CO 2 and H 2O by extracting a lattice oxygen in the absence of oxygen (photocatalytic decomposition, PCD). ![]() Ultraviolet light initiates reaction by exciting electrons from the valence to the conduction band of a semiconductor to create an electron–hole pair. ![]() Photocatalytic reactions clean waste air streams and indoor air, and are used for self-cleaning windows. Titania photocatalytically oxidizes low concentrations of organics at room temperature, and the anatase form of TiO 2 has a higher activity than the rutile form. ![]()
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