Some Critical Structure Factors of Titanium Oxide Nanotube Array in Its Photocatalytic Activity

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• 作者：Hui-Fang Zhuang ; Chang-Jian Lin ; Yue-Kun Lai ; Lan Sun ; Jing Li
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：July 1, 2007
• 年：2007
• 卷：41
• 期：13
• 页码：4735 - 4740
• 全文大小：290K
• 年卷期：v.41,no.13(July 1, 2007)
• ISSN：1520-5851

文摘

A highly ordered TiO₂ nanotube array on Ti substrate wasfabricated by using an electrochemical anodic oxidationmethod. The morphology, crystalline phase, and photoelectrochemical property of the nanotube array werecharacterized. The photocatalytic activity of the nanotubearray was evaluated by the decolorization of methylorange in aqueous solution using the different light sources.The effects of structure and morphology of the nanotubearray on its photocatalytic activity were investigated. It wasfound that the photoabsorption behavior of the TiO₂nanotube film depended on the structures of the nanotubearray. The nanotube array films exhibited a drasticallyenhanced photocurrent, and a higher photocatalytic activitycompared with the TiO₂ nanoparticle film prepared bythe regular sol-gel method. The experimental results indicatedthat the film thickness markedly influenced the photocatalyticactivity of nanotube array film, and the 2.5 m-thickTiO₂ nanotube array film appeared a maximum photodegradation efficiency to methyl orange. However, for a givennanotube length, the tube diameter was only very slightlyaffected the photocatalytic efficiency in this work. Theexplanation for some critical structure factors of TiO₂ nanotubearray in the photocatalytic activity was discussed aswell.