Visible light-sensitive yellow TiO2-xNx and Fe-N co-doped Ti1-yFeyO2-xNx anatase photocatalysts

K. S. Rane, R. Mhalsiker, S. Yin, T. Sato, Kuk Cho, E. Dunbar, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)

Abstract

Nitrogen substituted yellow colored anatase TiO2-xNx and Fe-N co-doped Ti1-yFeyO2-xNx have been easily synthesized by novel hydrazine method. White anatase TiO2-δ and N/Fe-N-doped samples are semiconducting and the presence of ESR signals at g ∼1.994-2.0025 supports the oxygen vacancy and g∼4.3 indicates Fe3+ in the lattice. TiO2-xNx has higher conductivity than TiO2-x and Fe/Fe-N-doped anatase and the UV absorption edge of white TiO2-x extends in the visible region in N, Fe and Fe-N co-doped TiO2, which show, respectively, two band gaps at ∼3.25/2.63, ∼3.31/2.44 and 2.8/2.44 eV. An activation energy of ∼1.8 eV is observed in Arrhenius log resistivity vs. 1/T plots for all samples. All TiO2 and Fe-doped TiO2 show low 2-propanol photodegradation activity but have significant NO photodestruction capability, both in UV and visible regions, while standard Degussa P-25 is incapable in destroying NO in the visible region The mid-gap levels that these N and Fe-N-doped TiO2 consist may cause this discrepancy in their photocatalytic activities.

Original languageEnglish
Pages (from-to)3033-3044
Number of pages12
JournalJournal of Solid State Chemistry
Volume179
Issue number10
DOIs
Publication statusPublished - 2006 Oct

Keywords

  • Anatase
  • Arrhenius plots
  • ESR
  • Electrical conductivity
  • Fe-N co-doped TiO
  • Hydrazine
  • N-TiO
  • Oxalate precursor
  • Oxalate-hydrazinate precursor
  • Photodegradation
  • XPS-N 1s peak

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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