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Degradation Processes of Organic Compounds Over Uv-Irradiated TiO2. Effect of Ozone

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UV irradiation of TiO2 promotes electrons from the valence band to the conduction band. The capabilities of the resulting redox system to degrade organic pollutants in water and the variety of products formed is illustrated here by the case of 2,3-dimethylpyrazine. Two debated questions, viz. (i) which electron-donors are implicated to fill in the electron deficiencies in the valence band? and (ii) is superoxide chemically invovled in the photocatalytic degradations?, are addressed by using quinoline, the photo-Fenton reaction and superoxide dismutase. Finally, the favourable effect of ozone is exemplified by the photoctalytic removal of monochloroacetic acid.

Affiliations: 1: URA au CNRS "Photocatalyse, Catalyse et Environnement", Ecole Central de Lyon, BP 163, 69131 Ecully Cedex, FRANCE; 2: URA au CNRS "Photocatalyse, Catalyse et Environnement", Ecole Central de Lyon, BP 163, 69131 Ecully Cedex, FRANCE, Università di Pavia, 27100 Pavia, and Università di Torino, 10125 Torino, ITALY; 3: Università di Pavia, 27100 Pavia, and Università di Torino, 10125 Torino, ITALY

10.1163/156856700X00200
/content/journals/10.1163/156856700x00200
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2000-01-01
2016-12-04

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