Photocatalytic remediation processes on air quality

M. E. MONGE; C. GEORGE; B. D'ANNA; J.-F. DOUSSIN; A. JAMMOUL; J. WANG; G. EYGLUNENT; G. SOLIGNAC; V. DAELE; A. MELLOUKI

Bordeaux

Jornada; Journées Européennes de la Photocatalyse; 2009

TiO2 has been incorporated into different matrixes in order to create selfcleaning and de-polluting surfaces as well as for air purification (1-3). Recently, the photoenhanced NO2 uptake for real mineral dusts with HONO production was assigned to the chemistry occurring on the TiO2 component;and the photochemistry of nitrate doped dust samples was proved to be a potential renoxification process of the atmosphere (4,5). In this study, we investigated the reactivity of irradiated TiO2 / SiO2 films with different TiO2 contents as proxies for de-polluting materials towards NO2. The role of O2 in the gas phase products distribution as well as the influence of nitrate on the reactivity of TiO2 films were investigated.