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

研究成果: Article査読

4 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)180-186
ページ数7
ジャーナルApplied Catalysis B: Environmental
162
DOI
出版ステータスPublished - 2015 1

ASJC Scopus subject areas

  • 触媒
  • 環境科学(全般)
  • プロセス化学およびプロセス工学

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