Formation of TiO 2 layers on commercially pure Ti and Ti-Mo and Ti-Nb alloys by two-step thermal oxidation and their photocatalytic activity

Shota Sado, Takatoshi Ueda, Kyosuke Ueda, Takayuki Narushima

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Anatase-containing TiO 2 layers were formed on commercially pure (CP) Ti and Ti-25mass%Mo (Ti-25Mo) and Ti-25mass%Nb (Ti-25Nb) alloys by two-step thermal oxidation. The first-step treatment was conducted in an Ar-1%CO atmosphere at 1073 K for 3.6 ks, and the second-step treatment was conducted in air at 673-1073 K for 10.8 ks. The second-step temperature range for anatase formation was wider in the Ti alloys than in CP Ti. Photo-induced superhydrophilicity under UV irradiation was observed for the TiO 2 layers with anatase fractions ≥0.6 on CP Ti and the Ti-25Mo alloy, and with anatase fractions ≥0.18 on the Ti-25Nb alloy. The TiO 2 layers on the Ti-25Nb alloy exhibited excellent photocatalytic activity in the low anatase fraction region, which is considered to be caused by the incorporation of 1-3 at% Nb into the TiO 2 layers. The rate constant of methylene blue degradation showed maxima at anatase fractions of 0.6-0.9.

Original languageEnglish
Pages (from-to)2198-2205
Number of pages8
JournalApplied Surface Science
Volume357
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Anatase
  • Photocatalysis
  • Thermal oxidation
  • Titanium alloy
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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