ROS diffusion in the gas phase during the photocatalytic process

Christa Fittschen (1) , Alina Aluculesei (1) , Alexander Parker (1) , Guillaume Vincent (2) , Eric Schaer (2) , Paul-Marie Marquaire (2) , Orfan Zahraa (2)

1 PC2A - Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522
2 DCPR - Département de Chimie Physique des Réactions

Water and air purification by photocatalysis can be considered as a major challenge for the years to come.[1] Photocatalytic processes use a semiconductor photocatalyst, usually TiO2, as a slurry or deposited on a support. The semiconductor is exposed to near-UV light (<387 nm) and generates electron-hole pairs e-/h+ separated by the valence band (VB) and the conduction band (CB). In the presence of air and humidity, electrons (e-CB) and holes (h+ VB) induce reduction and oxidation processes producing reactive oxygenated species (ROS) such as OH•, HO2•, H2O2, and 1O2,[2,3] for example, through the following reactions

Domaines: Chimie-Physique [physics.chem-ph]

Christa Fittschen, Alina Aluculesei, Alexander Parker, Guillaume Vincent, Eric Schaer, et al.. ROS diffusion in the gas phase during the photocatalytic process. 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, Sep 2008, San Diego, United States. ⟨hal-00370667⟩