Abstract: The influence of the modification of the TiO2 surface with F− ions on the physicochemical properties of the catalysts and efficiency in the photooxidation of gaseous molecules under atmospheric conditions and under UV irradiation was studied by IR spectroscopy. The fluorine-containing samples adsorb more water molecules than unmodified TiO2. The amount of adsorbed water increases with increasing content of surface fluoride ions. The fluorination of the TiO2 surface first leads to the substitution of the terminal OH groups by F− ions and to an increase in acidity of the bridging acidic OH groups remained on the surface. The modification also results in the structural rearrangement of the surface involving defective and surface Ti4+ sites. Fluorine modification increases the activity of TiO2 in the photocatalytic oxidation of ethanol, acetaldehyde, acetic acid, and acetone. At the same time, benzene and H2S are oxidized more rapidly on unmodified TiO2. The presence of fluorine on the TiO2 surface exerts almost no effect on the oxidation rate of chlorine-containing substrates C3H7Cl and C2H4Cl2.

Cite: Subbotina I.R. , Barsukov D.V. , Terent’ev A.O. , Krylov I.B.
Effect of TiO2 modification with fluorine on the physicochemical properties and activity in the photocatalytic oxidation of pollutants in air under UV irradiation
Russian Chemical Bulletin. 2021. V.70. N2. P.340-349. DOI: 10.1007/s11172-021-3091-9 Scopus OpenAlex

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Scopus:	2-s2.0-85101552837
OpenAlex:	W3135702305

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