Photocatalytic Degradation of Organic Dye on Sulfated Nanosize TiO_2 Sensitized by H_2O_2 under Visible irradiation

摘要

Nano-TiO_2 synthesized by hydrolysis of TiCl_4 demonstrated high reactivity in presence of peroxide hydrogen under visible light (λ>420nm).The nano-TiO_2 powders were characterized by XRD, Uv-Vis, FT-IR. The results showed that the TiO_2 nanocatalyst sensitized with peroxide hydrogen could absorb visible light up to 550nm, and Vis absorption could be extended to 600 nm for the sulfated TiO_2. Photocatylytic degradations of methyl orange and methylene blue were above 90% for sulfated TiO_2 in 180min. The inorganic sulfate species absorbing on the surface of titania were mainly responsible for the high activity of the TiO_2 under visible light regions.