Mechanochemical preparation of sulfur-doped nanosized TiO_2 and its photocatalytic activity under visible light

摘要

In order to make nanosized TiO_2 photocatalyst responsive to visible light and effectively utilize solar energy, we have, for the first time, prepared S-doped nanosized TiO_2 by a mechanochemical method with hydrolysis of TiCl_4. The as-prepared S-doped nanosized TiO_2 possesses strong absorption for visible light of 400-650 nm and shows high photocatalytic activity for decomposition of methylene blue under irradiation of visible light. The oxidation states of the S atoms incorporated into TiO_2 were determined to be S~(6+) and S~(4+). The comparative study of fluorescence emission spectra shows that S-doping has also improved the separation of electron-hole pairs.