Study On The Preparation And Performance Of Titanium Dioxide Film

In this paper, the titanium dioxide film was prepared by sol-gel and dip-pull method and used as a catalyst for photocatalytic degradation of methylthionine chloride (MC). The effects of preparing conditions on the performance of TiO2 film were studied. The crystal form and superficial appearance of TiO2 film were characterized by means of scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis, and then the relationship to the rate of MC photocatalytic degradation was also discussed.The use level of reagents and pH of the solution for producing titanium dioxide sol was investigated. Experimental results showed that the rate of MC photocatalytic degradation was up to 40% at UV-illumination time of 180 min over the TiO2 film prepared under conditions as follows:the volume ratio of Ti(OC4H9)4:C2H5OH:CH3COOH:H2O=9:36:2:1, calcination at 450℃for 1 h. The TiO2 film indicated favorable activity stability after reused for eight times under same photodegradation conditions mentioned above. When the photodegradation was carried out over TiO2 film plated for three to four layers, the rate of MC photocatalytic degradation could enhance to 46%. Based on the experiments, a complex film of Mo-doped TiO2 was prepared. A high activity of photodegradation was obtained when 0.6wt% content of Mo introducing to TiO2 film as a catalyst. The rate of MC photocatalytic degradation over the c(?) of 0.6% Mo-TiO2 complex film could reach to 1.7 times higher than that of TiO2 film.The heat-induced and photo-induced hydrophilicity was tested by measuring the contact angle of water on the TiO2 film surface. It was fund that the hydrophilicity enhanced either with increasing the calcination temperature for preparing TiO2 film or under an illumination of UV-light. Moreover, the heat-induced and photo-induced hydrophilicity enhanced with increasing the content of Mo doped to TiO2 film. The Mo-TiO2 complex film demonstrated an extra-hydrophilicity, as indicated by a zero degree of contact angle of water testing after UV-illumination time of 60 min on the 0.6wt% Mo-TiO2 complex film calcined at 450℃.