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The efficiency of nanosized mesoporous TiO 2 , SiO 2 /TiO 2  and SiO 2  films as photocatalytic coverings has been demonstrated by the example of adsorbed acridine orange (AO) dye photodegradation in air. SiO 2  - and TiO 2  - based functional coatings were prepared via template assisted sol-gel method. The films were characterized by electron microscopy (SEM, TEM), FTIR and UV-Vis spectroscopy. Hydrophylic properties of prepared films were estimated from the water contact angle measurements. Electronic spectra and LDI mass-spectra changes accompanying AO photodegradation under the UV-exposure were investigated and main photodestruction products have been determined. We suggest the photobleach of adsorbed AO on the surface of researched films is a result of the oxidation reaction of dye molecule with the oxygen species such as singlet oxygen and OH •  radical produced in the gas phase in presence of titania as well as in presence of sensitizer AO on silica surface. The observed photobleach of AO on the SiO 2  and SiO 2 /TiO 2  films proceeds through the photooxidative Ndemethylation of dimethylaminogroup in dye. Electronic and laser desorption/ionisation mass spectra give evidence that efficient photobleach of AO localized at the surface of anatase films proceeds through the following steps: 1- N-demethylation; 2- photodimerization; 3- photodegradation.

Spectroscopic and Mass-Spectrometric Study of Acridine Orange Photodegradation on the Surface of Mesoporous TiO 2 , SiO 2 /TiO 2 and SiO 2 Films