Photocatalytic coatings by N-doped titania for carbonatic stones.

Bergamonti L., Bondioli F., Predieri G., Paz Y., Fornasini L., Lottici P.P.
  Mercoledì 28/09   16:30 - 19:00   Edificio Psicologia 2 - Aula 3G   VI - Fisica applicata, Acceleratori e Beni Culturali
Titania nanoparticles are the most widely studied photocatalytic material and may give promising self-cleaning coatings for Cultural Heritage applications. To increase the photocatalytic performances of nanocrystalline titania, doping by non-metal elements to reduce the band-gap is employed. Here we report on a test of a self-cleaning coating for carbonatic stones based on N-doped titania nanoparticles by sol-gel. The nanoparticles were characterized by X-ray diffraction, UV-VIS, Raman and X-ray photoelectron spectroscopies. The self-cleaning efficacy and the contact angle of the coating was evaluated on carbonatic stones, by the photocatalytic oxidation of some organic dyes under solar lamp irradiation.