Ozone formation from illuminated titanium dioxide surfaces.
The nitrogen oxides (NO(x)) decomposition on illuminated TiO(2) surfaces has been widely studied, but little is known about the subsequent formation of non-nitrogen containing products. In this study, TiO(2) coated glass surfaces and TiO(2) films with nitrate anions (either premixed with TiO(2) as KNO(3) or deposited from gaseous NO(x)) are irradiated with broad-band light. Upon irradiation, detected gas phase products include NO(2), HNO(2), and O(3). To the best of our knowledge, this is the first study that reveals the production of O(3) from TiO(2) surfaces. By surface charge transfer reactions, nitrate anions are oxidized into nitrate radicals and their photochemistry (almost in the visible) leads to O(3) formation, enhancing the oxidizing power of these surfaces.
Institut de recherches sur la catalyse et l'environnement de Lyon, CNRS UMR 5256, Université Lyon 1. 2, Av. Albert Einstein, F-69626 Villeurbanne Cedex, France.
María Eugenia
ME
Monge
Christian
C
George
Barbara
B
D'Anna
Jean-François
JF
Doussin
Adla
A
Jammoul
Junnan
J
Wang
Grégory
G
Eyglunent
Géraldine
G
Solignac
Véronique
V
Daële
Abdelwahid
A
Mellouki