Preparation And Photocatalytic Properties Of TiO₂,TiO₂/CeO₂ Nanofibers

It is the high-tech century, the new industrial revolution which is rising for economizing the energy and the resource, protecting the ecology and implementing Sustainable Development in 21st century. As a comprehensive activator of Photocatalytic, TiO₂ nanofibers is stabile, cheap, easly obtained and high catalyses efficiency, so it is attended to repair the air and water pollution. Researchers discover that adulterate technic can enhance catalyses efficiency, TiO₂ complex material is a hotspot nowadays.Through sol-gel processing and electrospinning technique, thin fibers of PVP/Ti(OC4H9)4 and PVP/Ti(OC4H9)4/Ce(NO3)3 composite fibers were prepared. The favorite nanofibers with smooth surface, homogeneous diameters of 100-300nm and uniform morphology TiO₂,TiO₂/CeO₂ without changing their morphology via calcination in air were obtained. Then, the structures and physicochemical properties of the composites were characterized by field emission scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD), Raman scattering studies (Raman). In the end, the photocatalytic efficiencies of TiO₂,TiO₂/CeO₂ were assessed by monitoring the photodegradation of Methylene blue. Research results indicate that:1. Heat treatment about rising temperature rate has an important infection on fibre appearances: For fine fibre appearances, heat treatment speed must control below 40oC/h.2. Heat treatment temperature has an important infection on crystal configuration : For pure TiO₂ , the XRD results showed that the anatase-type TiO₂ was formed at 500℃and transformed to rutile at 600℃;But for TiO₂/CeO₂, as the temperature to 800℃, rutile phase began to form. Compared to the pure TiO₂ nano-fibers, Ce dopant had a great inhibition on TiO₂ crystalline.3. Temperature and adulterate concentration has an important infection on Photocatalytic degradation: For pure TiO₂, the maximum photocatalytic decomposition rate was achieved with a calcination temperature at 500℃, as the calcinations temperature increased to 600℃and 700℃, the photoactivity decreased. Moreover, the sample is easy to be reclaimed and considerable high photocatalytic efficiency can be obtained.For TiO₂/CeO₂, the photocatalytic reactions confirmed that TiO₂/CeO₂ enhanced photocatalytic activity relative to the pure TiO₂ .The high photocatalytic efficiency can be obtained when the calcination temperature was 600℃and the Ce contained was 0.5mol%.