Preparation And Photocatalytic Properties Of TiO₂/NiO,TiO₂/SiO₂ Nanofibers

Through sol-gel processing and electrospinning technique, ultrathin fibers of poly vinyl pyrrolidone PVP/Ti(OPr)₄/Ni(CH₃COO)₂composite were prepared. After calcinations of the above precursor fibers at 600℃, the TiO₂/NiO nanofibers, with a diameter of 50-100nm, were successfully obtained. The fibers were investigated by scanning electron microscopy,FT-IR, wide-angle X-ray diffraction, and Raman, respectively. This paper introduced the mechanism of nano—sized TiO₂ photo—catalytic oxidation technology systematically,photo—catalytic capability was tested using of Rhodamine B being a degradation material. The result indicates that: 0.5% TiO₂/NiO nanofibers particles exhibited the more photo—catalytic degradation.pyrrolidone(PVP)/titanium butyloxide composite fibers were prepared. After calcination of the above precursor fibers at 500℃,the PVP/Ti(OPr)₄/(C₂H₅O)₄Sianofibers were successfully obtained. The fibers were characterized by fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, X-ray diffraction(XRD), scanning electron microscopy (SEM), and its photocatalytic properties were examined by degradation of Rhodamine B under UV light. The result indicated that the fiber we obtained at the calcination temperature of 600℃was amorphous. Gradually, anatase of TiO₂ was formed When the temperature increased to 700℃,As the temperature to 800℃, rutile phase began to form. Compared to the pure TiO₂ nano-fibers, Si dopant had a great inhibition on TiO₂ crystalline temperature and phase transformation,the particle size was smaller. The high photocatalytic efficiency can be obtained when the calcination temperature was600℃.