The Research Of The Influences Of Metal Ions'Doping On The Photocatalytic Property Of Nano-Sized TiO₂ Thin Films

In this paper, TiO₂ thin films doped by different metal ions were prepared on the microscope slides and ceramic tiles by Sol-gel method. Meanwhile, the photocatalytic property of TiO₂ thin films influenced by doped metal ions were researched.The microstructure, surface morphology and crystal particle sizes of TiO₂ thin films were investigated by AFM and XRD. Besides, the light-absorbing property of the films were analyzed by Ultraviolet-Visible Spectrophotometer. The influences of annealing temperature and thickness of the films on the photocatalytic property of TiO₂ films were also discussed. Moreover,we mainly researched on the influences of different doped metal ions on the photocatalytic property of TiO₂ films by degradating heavy oil, water solutions of Rhodamine B, Methyl orange and Mthylene blue. Then the influences of mutual effects between the carriers and the films on the photocatalytic property of TiO₂ films were discussed. The following results were obtained:(1) The TiO₂ films were rough and continuous,the crystal particles were even . (2) The TiO₂ thin films had little absorption during the visible light spectrum while absorbed almost all lights during the ultraviolet light spectrum; For the TiO₂ films doped by the transition metal ions, the blue migration extent increased with the increase of ionic radius, and for the TiO₂ films doped by the lanthanon ions,the red migration extent increased with the decrease of ionic radius.(3) The preparing parameters for TiO₂ thin films with maximum degradation efficiency for dye solution and best photocatalytic property were 4-layer thickness, annealing at 500℃ for 2 hours.