Issue 0, 1979
From the journal:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases

Photo-adsorption and photo-desorption of oxygen on highly hydroxylated TiO2 surfaces. Part 1.—Role of hydroxyl groups in photo-adsorption

Guillermo Munuera,   Vicente Rives-Arnau  and  Antonio Saucedo  

Abstract

The photo-activity of TiO2(anatase P. 25) samples with a “fully hydroxylated surface” was studied in the presence of oxygen. Photo-adsorption of oxygen was observed in the early stages of u.v. illumination reducing the pressure to < 0.1 N m–2. After this fast adsorption, slow photo-desorption of oxygen was detected continuing for several hours. Thermal removal of water and hydroxyl groups reduced photo-adsorption and the process became diffusion controlled. Rehydration restored fast photo-adsorption and first order kinetics. Photo-desorption of water accompanied photo-adsorption of oxygen on these “fully hydrated surfaces”. A mechanism involving the formation of OH· radicals and their reaction to give H2O2, which decomposes leading to oxygen photo-desorption, is proposed to explain these facts.

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Article information

DOI
https://doi.org/10.1039/F19797500736
Article type
Paper

J. Chem. Soc., Faraday Trans. 1, 1979,75, 736-747

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Photo-adsorption and photo-desorption of oxygen on highly hydroxylated TiO2 surfaces. Part 1.—Role of hydroxyl groups in photo-adsorption

G. Munuera, V. Rives-Arnau and A. Saucedo, J. Chem. Soc., Faraday Trans. 1, 1979, 75, 736 DOI: 10.1039/F19797500736

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