Preparation and Properties of Titanium Oxide Photocatalyst with Visible Light Activity

摘要

TiO_2 photocatalyst were obtained from the hydrolysis product of TiOSO_4 with ammonia and the photocatalytic activities were investigated by the photocatalytic degradation of methyl orange aqueous solution under UV-light and visible-light. The results showed that the absorption intensity in visible-light was dependent on the concentration of the materials, pH value and heat-treatment temperature. The color of the TiO_2 varied from yellowish to vivid yellow when the TiO_2 was calcined at different temperatures from 300℃ to 500℃ for 1h. The photocatalytic activity of TiO_2 under visible light was determined by the photo-absorption feature in visible light region, which was related to the heat-treatment temperature. The TiO_2 calcined at 400℃ shows stronger photo-absorption in visible light region and exhibits higher visible-light activity than the TiO_2 calcined at other temperature.