Local structure of vanadium in Ti-6Al-4V alloy anodized in acetic acid aqueous solution and its contribution to visible light response in photocatalysis

Yoshiteru Mizukoshi, Toshihiro Okajima, Naoya Masahashi

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Anodization of Ti-6Al-4V alloy in acetic acid aqueous solution resulted in the formation of amorphous oxide on its surface; the amorphous oxide transformed into crystalline oxide primarily consisting of anatase TiO2 by annealing. The annealed anodic oxide, especially those anodized in 1-2molL-1 acetic acid aqueous solution, could photocatalytically decompose acetaldehyde under visible light illumination. X-ray photoelectron spectroscopy, Raman spectroscopy, and X-ray absorption near-edge structure spectroscopy analyses showed that the vanadium is pentavalent and exists in an oxygen-tetragonal structure composed of VO43- units. When the vanadate absorbs visible light, the excited electrons move into the conduction band of anatase TiO2 so that recombination with holes was restricted. As a result, the anodic oxide exhibited superior photocatalytic activity under visible light illumination.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalApplied Catalysis B: Environmental
Volume162
DOIs
Publication statusPublished - 2015 Jan

Keywords

  • Anodization
  • Photocatalyst
  • Titanium alloy
  • Vanadate
  • Visible light response

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Local structure of vanadium in Ti-6Al-4V alloy anodized in acetic acid aqueous solution and its contribution to visible light response in photocatalysis'. Together they form a unique fingerprint.

Cite this