Photocatalytic performance of iron (III) and niobium (V)-codoped TiO 2 nanopowders synthesized by a radio frequency thermal plasma process

C. N. Zhang, M. Ikeda, T. Uchikoshi, J. G. Li, Takayuki Watanabe, T. Ishigaki

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1 Citation (Scopus)

Abstract

Iron (III) and niobium (V)-codoped TiO2 nanopowders have been synthesized by Ar/O2 RF thermal plasma. Phase composition, morphology, and photocatalytic performance of the plasma-generated powders have been investigated by the combined means of XRD, FE-SEM/TEM, and UV-vis absorption spectroscopy. Rutile formation in the plasma-produced phase composition of anatase and rutile was promoted by Fe3+ addition but was inhibited by Nb5+ doping. The resultant powders consisted of a majority of fine crystallites (several nanometers) and a small portion of coarse particles (~ 100 nm). In comparison with TiO2 singly doped with 0.1 at.% of Fe3+, photocatalytic reactivity of codoped TiO2 was improved at 2.0 at.% of Nb5+ but was depressed at 6.0 at.% under the UV irradiation, indicating that UV-induced photocatalytic capability was dominated by Nb5+ doping concentration. In contrast to the case of 1.0 at.% of Fe3+ single addition, the codoped sample obtained the decreased photocatalytic performance with increasing Nb5+ content under the visible light irradiation, due to the low visible light absorption resulting from a broadened band gap.

Original languageEnglish
Pages (from-to)6940-6943
Number of pages4
JournalThin Solid Films
Volume519
Issue number20
DOIs
Publication statusPublished - Aug 1 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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