Fabrication of visible-light-responsive titanium dioxide layer on titanium using anodic oxidization in nitric acid
Fabrication of visible-light-responsive titanium dioxide layer on titanium using anodic oxidization in nitric acid
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DOI：
10.1016/j.apsusc.2013.01.071
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发表时间：
2013-04
影响因子：
6.7
通讯作者：
N. Ohtsu;Hirotaka Kanno;Shinji Komiya;Y. Mizukoshi;N. Masahashi
中科院分区：
文献类型：
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作者：
N. Ohtsu;Hirotaka Kanno;Shinji Komiya;Y. Mizukoshi;N. Masahashi
通过在硝酸 (HNO3) 水溶液中对钛板进行阳极氧化，然后在空气中于 723K 下退火 5 小时，制备了可见光响应二氧化钛 (TiO2) 层。氧化物层的主要结构是具有锐钛矿结构的TiO2，其中含有约。 1at% 的掺入氮。随着阳极氧化电压的增加，锐钛矿型TiO2的晶粒尺寸增大，但掺入氮的原子比几乎恒定。 TiO2层可以在370nm的紫外光下降解亚甲基蓝（MB）溶液，表现出光催化活性。随着氧化物微晶尺寸的增加，活性单调增加。晶粒尺寸超过特定值的TiO2层在420、450和505nm可见光下表现出优异的响应。总的来说，这项研究的结果表明，在 HNO3 溶液中阳极氧化 Ti 是制备可见光响应 TiO2 层的一种有前途的技术。
A visible-light-responsive titanium dioxide (TiO2) layer was fabricated by anodizing a Ti plate in aqueous nitric acid (HNO3) solutions, followed by annealing at 723K for 5h in air. The predominant structure of the oxide layer was TiO2with an anatase structure that contained ca. 1at% of incorporated nitrogen. The crystallite size of the anatase TiO2was enlarged as anodizing voltage increased, but the atomic ratio of the incorporated nitrogen was almost constant. The TiO2layers could degrade methylene blue (MB) solution under an UV light at 370nm, exhibiting photocatalytic activity. The activity increased monotonically as the crystallite size of the oxide increased. The TiO2layers with their crystallite size exceeding a specific value showed excellent response under visible light at 420, 450, and 505nm. Overall, the results of this study showed that anodic oxidization of Ti in HNO3solution is a promising technique for fabrication of a visible-light-responsive TiO2layer.