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

Research output: Contribution to journalArticle

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

Fingerprint

Niobium
Plasma Gases
thermal plasmas
niobium
rutile
radio frequencies
Iron
Plasmas
Phase composition
iron
Powders
irradiation
electromagnetic absorption
Doping (additives)
Irradiation
anatase
crystallites
absorption spectroscopy
reactivity
Ultraviolet spectroscopy

All Science Journal Classification (ASJC) codes

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

Cite this

Photocatalytic performance of iron (III) and niobium (V)-codoped TiO 2 nanopowders synthesized by a radio frequency thermal plasma process. / Zhang, C. N.; Ikeda, M.; Uchikoshi, T.; Li, J. G.; Watanabe, Takayuki; Ishigaki, T.

In: Thin Solid Films, Vol. 519, No. 20, 01.08.2011, p. 6940-6943.

Research output: Contribution to journalArticle

Zhang, C. N. ; Ikeda, M. ; Uchikoshi, T. ; Li, J. G. ; Watanabe, Takayuki ; Ishigaki, T. / Photocatalytic performance of iron (III) and niobium (V)-codoped TiO 2 nanopowders synthesized by a radio frequency thermal plasma process. In: Thin Solid Films. 2011 ; Vol. 519, No. 20. pp. 6940-6943.
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