Effects of hydronium intercalation and cation substitution on the photocatalytic performance of layered titanium oxide

Mi Jeong Paek, Tae Woo Kim, Seong Ju Hwang

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20 Citations (Scopus)

Abstract

We have investigated the effects of hydronium (H3O+) intercalation and transition metal substitution on the photocatalytic activity of layered titanate. The basal spacings of the cesium titanate and Fe-/Ni-substituted titanates are notably expanded by 1 M HCl treatment, indicating the intercalation of hydronium ion. Diffuse reflectance UV-vis spectroscopic results clearly demonstrate that, in contrast to the hydronium intercalation, the substitution of transition metal ions gives rise to a remarkable narrowing of bandgap energy down to ∼1.9-2.3 eV. According to Fe K- and Ni K-edge X-ray absorption spectroscopic analysis, the substituted iron and nickel ions are stabilized in octahedral titanium sites with trivalent and divalent oxidation states, respectively. The photodegradation tests for organic dye molecules reveal that the hydronium intercalation enhances remarkably the photocatalytic performance of cesium titanate under UV irradiation and the substitution of Fe or Ni endows wide bandgap titanate with visible light driven photocatalytic activity.

Original languageEnglish
Pages (from-to)1444-1446
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number5-6
DOIs
Publication statusPublished - 2008 May 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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