Formation of TiO2 layers on commercially pure Ti and Ti-Mo and Ti-Nb alloys by two-step thermal oxidation and their photocatalytic activity

被引：13
|
作者：
Sado, Shota [1 ]
Ueda, Takatoshi [1 ]
Ueda, Kyosuke [1 ]
Narushima, Takayuki [1 ]
机构：
[1] Tohoku Univ, Dept Mat Proc, Sendai, Miyagi 9808579, Japan
来源：
APPLIED SURFACE SCIENCE | 2015年 / 357卷
关键词：
Anatase; Titanium dioxide; Titanium alloy; Thermal oxidation; Photocatalysis; CP-TI; TITANIUM; ANATASE; RUTILE; DEPOSITION; HYDROPHILICITY; REDUCTION; SURFACE; OXIDES; FILMS;
D O I：
10.1016/j.apsusc.2015.09.211
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Anatase-containing TiO2 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 1073K 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 TiO2 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 TiO2 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 TiO2 layers. The rate constant of methylene blue degradation showed maxima at anatase fractions of 0.6-0.9. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：2198 / 2205
页数：8
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