Solvothermal synthesis and photocatalytic activity of S-doped TiO2 and TiS2 powders

The photocatalytic activity of S-doped TiO2 powder depends on the S content. To synthesize S-doped TiO2 powders with high S content, solvothermal processes were used in this work. The S-doped TiO2 powder contains 2.0 M% sulfur and has an absorption edge of 460 nm (2.7 eV). The pure TiS2 powder also synthesized by a solvothermal process has an absorption edge of 595 nm (2.08 eV) and broad absorption above 595 nm. The photocatalysis experiments indicate that the degradation of methyl orange is associated with the light adsorption edge. The photocatalytic activity is much larger for the pure TiS2 powder than for partially S-doped TiO2 powder.