Preparation of Doped Nano-TiO2 by Sol-Gel Method and the study on Its Photocatalytic Performance

The paper produces Nano-TiO₂ doped with Fe³⁺, Ce³⁺, Cu²⁺, Ce³⁺ and La³⁺ using sol-gel method, examines the effects of their preparation condition on catalyst performance, and then explores the influence of the adding amount of metal ions and different ions combinations on photocatalytic activity of modified Nano-TiO₂. The result indicates the optimum condition for preparing doped Nano-TiO₂ adopting sol-gel method as following. Firstly, at the temperature of 20°C, add 2 ml of nitric acid into the testing solution with 1 hour stirring at speed of 200 r/min; secondly, deposit the solution for 5 hours; and then calcinate above precipitate for 2 hours at the temperature of 500°C. The final product is Nano-TiO₂ prepared by sol-gel method. In addition, the comparisons of the effects of single-group ion doped product and double-group ones show that Nano-TiO2 doped with Cr³⁺ (2.2wt%), La³⁺ (0.5wt %) and Fe³⁺ (0.2wt %) possesses the strongest photocatalytic activity.