V and F Codoped TiO<sub>2</sub>-SiO<sub>2</sub> Composite Films for Enhanced Photocatalytic Activity

A simple process was developed for preparation of highly photoactive V and F codoped TiO 2 -SiO 2 composite film. The as-prepared specimens were characterized using Brunauer–Emmett–Teller (BET) surface area, photoluminescence (PL) spectra, and UV–Vis spectroscopy. The BET results revealed that the surface area of the modified TiO 2 sample was 413 m 2 g -1 , while pure TiO 2 103 m 2 g -1 . The PL results showed that the recombination rate of the photo-generated electrons and holes was effectively prohibited via the multi-modification. The photocatalytic activities of the films were evaluated by degradation of methyl green (MG) dye. Compared with pure TiO 2 film, the multi-modified TiO 2 film exhibited excellent photocatalytic activity and clearly responsive to the visible light. Keywords : V and F codoping; TiO 2 -SiO 2 composite film; Photocatalytic activity