S. Sang-urai, A. Worayingyong, S. Mansiri, M.F. Smith, S. Seraphin
Kasetsart University, TH
titanium dioxide, nanofibers, electrospinning, cerium-doped
Mixed phase TiO2 and Ce-doped TiO2 nanofibers with different content (0.5, 2.0, 8.0%) ofcerium ions were prepared by a sol-gel electro-spinning method. Results from SEM showed nobeads on the undoped-TiO2 and Ce-doped TiO2 nanofibers with diameters in the range of 77-130nm. TEM images exhibited that the undoped TiO2 crystallite size on the fiber was bigger thanthose on the Ce-doped samples. XRD and Ti K-edge XANES were used to determineanatase/rutile phase ratios in pure TiO2 nanofibers, whereas only XANES was used tocharacterize the anatase/rutile phase ratios in the Ce-doped TiO2 samples. Ce L3-edge XANESexhibited peak associated with Ce3+ (5727 eV.) in addition to Ce4+ (5731 and 5738 eV.).Samples with the lowest Ce content had the greatest fraction of Ce ions in the Ce3+ state. Thephotocatalytic activity of the prepared nanofibers was observed by degradation of Rhodamine Bunder visible light, and the fiber of 0.5 % Ce-doped TiO2 exhibited the highest activity.