The Photocatalytic Properties Of Iron-doped Titanium Dioxide Thin Films

With the development of economy, people now pay more attention to the environment. As a environmental material, the titanium dioxide has evokes more and more interest of researchers.. Photocatalytic degradation is a new technology of treating waste water with a high effencicy of treatment, simple equipment, easy-controlled, and without particular degration of pollutant ang secondary polluting etc. The naissance of the Photocatalytic degradation technology has blazed a new way in treating the waste water. Among a variety of semiconductor compounds which have catalyzing effect, the titanium dioxide becomes the most often used catalyst for its many advantages such as wide veto band, stronger oxidizing ability, and good chemical stability, high catalyzing power , good resist to wear away, low cost and availability , non - toxic, anundant in Nature.In this dissertation, the titanium dioxide films were prepared by sol-gel process. After doping Fe³⁺, the XRD features of TiO₂ have been investigated and the effect of photocatalytic degradation of the Methyl orange and Methylene Blue by TiO₂ have also determined.The sintering temperature has been found to affect the TiO₂' s crystalization. At 400℃, 600℃, the crystal of titanium dioxide was better than that at temperature of 200℃. The anatase-typed crystal of TiO₂ getting pefect witj the heat preservation time.The results obtained indicate that doping of Fe³⁺ into TiO₂ film has a positive effect to the photocatalytic degradation. To Methyl orange, when the concentration is 5mg/l, the best condition is pH=2 under UV light for lOhs , the degradation reached 97.44%;when the concentration is 10mg/1, the best condition is pH=3 under UV light for 14hs , the degradation reached 97.96%;when the concentration is 15mg/l, the best condition is pH=3 under UV light for 16hs , the degradation reached 98.24%;when theconcentration is 20mg/l, the best condition is pH=2 and pH=3 under UV light for 16hs , the degradation reached 98. 15%. To Methylene Blue, when it' s concentration is 10 mg/1, the best condition is pH=5, the degradation reached 99. 52%.In this dissertation, the degradation mechanism of xanthate with a combined use of the Fenton method. The results obtained TiOz film with doped Fe3+ has better effect to the photocatalytic degradation of xanthate and the degradation reached 96.44%.