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The processes of dark, UV, and visible light promoted desorption of surface species were investigated for three different TiO 2  samples: TiO 2  prepared by dispersion of the titania single crystal, TiO 2  prepared by combustion of a pyrotechnic mixture in air, and commercial TiO 2  P25. The composition of the adsorbed layer was identified in the dark and under UV and visible light irradiation. The composition of desorption products showed the dependence of the adsorption layer state on the TiO 2  nature. Methane photodesorption was detected only for the commercial TiO 2  P25. Possible reasons for methane emission include the capturing of complete molecules during the TiO 2  production process and photocatalytic hydrogenation of CO 2  under UV-light.

Composition of Surface Adsorbed Layer of TiO<sub>2</sub> Stored in Ambient Air