TiO₂-Based Composite Film for the Photodegradation of Methyl Green

Abstract

A simple process was developed for preparation of highly photoactive Fe and S codoped TiO2-SiO2-ZnO composite film. The Brunauer–Emmett–Teller (BET) surface area results showed that the specific surface area of the composite TiO2 sample was 432.5m2g-1, while that of the pure TiO2 was 103.4m2g-1. The diffuse reflectance measurements exhibited an extension of light absorption into the visible region for the composite TiO2. The photoluminescence (PL) spectra analysis indicated that the electron-hole recombination rate was effectively inhibited in the composite TiO2. The photocatalytic activities of the TiO2 films were evaluated by the photocatalytic decomposition of methyl green in aqueous solution. The composite TiO2 film exhibited excellent photocatalytic activities compared to pure TiO2 film.