Photo-catalytic degradation of dimethyl disulfide on S and metal-ions co-doped TiO2 under visible-light irradiation

The sulfur and transition metal co-doped TiO2 catalysts were prepared by a sol-gel method. The physical and chemical properties of these photo-catalysts were characterized by thermo-gravimetric/differentialthermal analysis, X-ray diffraction, X-ray photoelectron spectroscopy, UV-vis, and Fourier transforminfrared spectroscopy. Compared to pure TiO2 and S/TiO2, sulfur and transition metal co-doped TiO2 catalysts have smaller crystal size and shift to visible-light absorption region. The XPS spectra confirm that V4+, Fe3+, and S6+ are successfully doped into the lattice of TiO2, but Zn2+ is adsorbed on the surface of TiO2. So.osZno.om /TiO2 shows the best photocatalytic activity and S-VOCs tolerance for the degradation Of dimethyl disulfide under visible irradiation. Several possible mechanisms have been developed for co-doped TiO2 under visible-light in this study. (C) 2013 Elsevier B.V. All rights reserved.