TY - JOUR
T1 - Local structure of vanadium in Ti-6Al-4V alloy anodized in acetic acid aqueous solution and its contribution to visible light response in photocatalysis
AU - Mizukoshi, Yoshiteru
AU - Okajima, Toshihiro
AU - Masahashi, Naoya
N1 - Funding Information:
The authors wish to thank Ms. Y. Matsuda from IMR, Tohoku University, for preparing samples and evaluating photocatalytic activities, Mr. S. Sugiyama from IMR, Tohoku University, for preparing the Ti64 substrates, Ms. K. Ohmura from IMR, Tohoku University, for XPS analyses, Dr. J. Kugai from Osaka University for ICP analyses, and Shimadzu Co., Ltd., for their helpful assistance with Raman microscopy measurements. This study was partially supported by the Izumi Science and Technology Foundation .
PY - 2015/1
Y1 - 2015/1
N2 - 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.
AB - 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.
KW - Anodization
KW - Photocatalyst
KW - Titanium alloy
KW - Vanadate
KW - Visible light response
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U2 - 10.1016/j.apcatb.2014.06.050
DO - 10.1016/j.apcatb.2014.06.050
M3 - Article
AN - SCOPUS:84904439336
SN - 0926-3373
VL - 162
SP - 180
EP - 186
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -