| Summary: | TiO<sub>2</sub> thin films, modified by acetylacetone (AcacH) in solution, were deposited on glass substrate by ultrasonic spray pyrolysis and tested for photocatalytic activity in a multi-section continuous flow reactor by degradation of acetone and acetaldehyde under ultraviolet and visible light. The increase in molar ratio of AcacH in respect of titanium (IV) isopropoxide (TTIP) from 1:5 to 1:8 modified the electronic structure of the films, favoring enhanced photocatalytic activity. The photocatalytic activity was enhanced approximately twofold on the film with molar ratio 1:8 under both irradiations; the film completely oxidized 10 ppm of acetone and acetaldehyde. The photocatalytic efficacy of TiO<sub>2</sub> films in oxidation of air pollutants was three times higher compared to the industrial glass Pilkington Activ<sup>TM</sup>. Moreover, all the synthesized films indicate antibacterial efficiency against <i>E. coli</i> of over 99% under ultraviolet. TiO<sub>2</sub> film, with TTIP:AcacH molar ratio 1:8 having great possibility for its commercial use as a material for indoor air purification.
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