Study On The Preparation And Photocatalysis Of TiO₂ Film On Aluminum

With the development of industry , the problem of pollution is getting more and more serious.The Purification Technology in the Environment has become more and more important. In technique measures of controlling water pollution, nanocrys- talline TiO₂ can produce the oxidative hyaroxyl radical by UV light,which has potential to degrade all organics into CO2 and H2O,and has high clarity, the high speed of degradation as well as no second pollution.TiO₂ are divided into TiO₂ thin films and nano size TiO₂ powder. Because of its easy-recycled, good stability and other merits,TiO₂ thin film is widely applied and becomes an important area on the research of photocatalyst. Electrodeposition is the common preparation methods for nanosized TiO₂ thin film, and has many merits such as: low production cost,simple process, easy operation, easy quality control of the thin film, and suitable for mass production than other methods. But up to now, study on preparation of TiO₂ nanofilm by electrodeposition is rare in China and abroad.Titanium dioxide film was prepared on the surface of alumina via pulsed anodizing and AC electrodeposition . Electrodeposition principle of TiO₂ composite film and the main influence factors in the processes of preparation were analyzed. The photo-catalytic power of the TiO₂ composite film has been promoted through metal doped nano-TiO₂. The main results and conclusion can be summarized as follows:(1) Through pulse anodizing, Al₂O₃ was successfully obtained on aluminum surface. Analysis of various factors in pluse anodizing through orthogonal design, the optimal oxidation condition can be determined .(2) Nano-TiO₂ could be electrodeposited in the pores of Al₂O₃ under the appropriate voltage and deposition time through AC deposition, then TiO₂/Al₂O₃ composite film was obtained. Meanwhile, influences technological condictions(such as deposit liquid's formulation, the calcination temperature, deposition temperature and other factors)on optical properties of TiO₂ film were discussed.(3) Metal (Ni,Co,Cu) were electrodeposited on TiO₂/Al₂O₃ composite film with the appropriate voltage and deposition time through AC. TiO₂/Al₂O₃ and M/TiO₂/Al₂O₃ composite film were used to photoca- talyst in degradation of methylene blue. Effects of metal on photocatalytic property of TiO₂/Al₂O₃ composite film were discussed.