Abstract
The results of studies on the effect of the preparation procedure on the properties of TiO2-based photocatalysts and the kinetics and mechanism of the photocatalytic oxidation of organic water pollutants are surveyed. The effects of calcination temperature, surface modification with platinum, and acid-base treatment of the surface of titanium dioxide on its activity in model gas-phase and liquid-phase reactions are considered. Optimal catalyst preparation conditions were found in order to achieve maximum activity, and conceivable reasons for the effects of the above factors on the activity were revealed. The intermediate products and mechanisms of the photocatalytic and dark reactions of solutes that simulated chemical warfare agents in water are considered. All of the test simulants can undergo complete oxidation to form inorganic products in an aqueous TiO2 suspension under irradiation with UV light. It was found that, in addition to oxidation, the dark steps of hydrolysis also play an important role in the degradation of these substances. The low-frequency ultrasonic treatment (20 kHz) of a photocatalyst suspension in the course of the photocatalytic oxidation of dimethyl methylphosphonate can accelerate the reaction because of the facilitated transport of reactants to the surface of photocatalyst particles.
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Translated from Kinetika i Kataliz, Vol. 46, No. 2, 2005, pp. 203–218.
Original Russian Text Copyright © 2005 by Vorontsov, Kozlov, Smirniotis, Parmon.
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Vorontsov, A.V., Kozlov, D.V., Smirniotis, P.G. et al. TiO2 photocatalytic oxidation: I. Photocatalysts for liquid-phase and gas-phase processes and the photocatalytic degradation of chemical warfare agent simulants in a liquid phase. Kinet Catal 46, 189–203 (2005). https://doi.org/10.1007/s10975-005-0067-y
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DOI: https://doi.org/10.1007/s10975-005-0067-y