Technical Proceedings of the 2013 Clean Technology Conference and Trade Show

Cleantech 2013

Chapter 8: Materials for Catalysis

S. Sang-urai, A. Worayingyong, S. Mansiri, M.F. Smith, S. Seraphin
Kasetsart University, TH
314 - 317
titanium dioxide, nanofibers, electrospinning, cerium-doped
Mixed phase TiO2 and Ce-doped TiO2 nanofibers with different content (0.5, 2.0, 8.0%) of cerium ions were prepared by a sol-gel electro-spinning method. Results from SEM showed no beads on the undoped-TiO2 and Ce-doped TiO2 nanofibers with diameters in the range of 77-130 nm. TEM images exhibited that the undoped TiO2 crystallite size on the fiber was bigger than those on the Ce-doped samples. XRD and Ti K-edge XANES were used to determine anatase/rutile phase ratios in pure TiO2 nanofibers, whereas only XANES was used to characterize the anatase/rutile phase ratios in the Ce-doped TiO2 samples. Ce L3-edge XANES exhibited 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. The photocatalytic activity of the prepared nanofibers was observed by degradation of Rhodamine B under visible light, and the fiber of 0.5 % Ce-doped TiO2 exhibited the highest activity.
Structural characterization and photocatalytic activity of electrospun TiO2 and Ce-dopedTiO2 nanofibers