Visible-light-driven photocatalysis on fluorine-doped TiO 2 powders by the creation of surface oxygen vacancies
Abstract
F-doped TiO 2 (FT) powders were prepared by spray pyrolysis from an aqueous solution of H 2TiF 6. These FT powders demonstrated very high visible-light (Vis) photocatalytic activities for decompositions of both acetaldehyde and trichloroethylene, although their UV-Vis spectra indicated that F-doping had less effect on the optical absorption property of bulk TiO 2. However, photoluminescence (PL) spectra revealed that two kinds of oxygen vacancies ( F and F+ centers) were formed by F-doping. The appearance of Vis photocatalytic activity for FT powders was ascribed to the creation of these oxygen vacancies.
- Publication:
-
Chemical Physics Letters
- Pub Date:
- January 2005
- DOI:
- 10.1016/j.cplett.2004.11.126
- Bibcode:
- 2005CPL...401..579L