Sustained production of H2O2 on irradiated TiO2- fluoride systems.
UV irradiation of fluorinated TiO(2) suspensions in water, in the presence of oxygen and a hole scavenger, leads to the production of H(2)O(2) with steady state concentration levels up to 1.3 millimolar; the H(2)O(2) formation rate follows the TiO(2) surface speciation, being maximum when the surface is completely covered by [triple bond]Ti-F groups; these results outline the importance of surface speciation on the photocatalytic process.
Maurino
Valter
V
Dipartimento di Chimica Analitica - Università di Torino and NIS, Nanostructured Interfaces and Surfaces Centre of Excellence, Via P. Giuria 5, 10125, Torino, Italy. valter.maurino@unito.it
Minero
Claudio
C
Mariella
Giuseppe
G
Pelizzetti
Ezio
E
D005459:Fluorides / Q000737:chemistry* / Q000528:radiation effects*; D006861:Hydrogen Peroxide / Q000138:chemical synthesis*; D006863:Hydrogen-Ion Concentration; D010777:Photochemistry; D013499:Surface Properties; D013997:Time Factors; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*; D014466:Ultraviolet Rays
C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D005459:Fluorides