Photoelectrocatalytic Activity of Highly Ordered TiO2 Nanotube Arrays Electrode for Azo Dye Degradation

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• 作者：Zhonghai Zhang ; Yuan Yuan ; Guoyue Shi ; Yanju Fang ; Linhong Liang ; Hongchun Ding ; Litong Jin
• 刊名：Environmental Science & Technology
• 出版年：2007
• 出版时间：September 1, 2007
• 年：2007
• 卷：41
• 期：17
• 页码：6259 - 6263
• 全文大小：355K
• 年卷期：v.41,no.17(September 1, 2007)
• ISSN：1520-5851

文摘

A highly ordered titanium dioxide nanotube arrays(HOTDNA) electrode was prepared in hydrofluoric acidsolution by electrochemical anodization technique on a puretitanium sheet. The HOTDNA electrode was characterizedby FE-SEM microscopy, X-ray diffraction, and UV-visspectra. The linear-sweep photovoltammetry response onthe HOTDNA electrode is presented in this work. Thephotogenerated current of 0.3 mA/cm² was observedsignificantly upon illumination with applied potential of 0.5V in the UV regions at the central wavelength of 253.7nm. Photoelectrocatalytic (PEC) and photocatalytic (PC)activities of the HOTDNA electrode were evaluated in thedegradation of methyl orange (MeO) in aqueous solution.A set of optimized conditions such as anodic potential,calcinations temperature, and MeO concentration on thePEC activity was investigated. The PEC and PC activities ofHOTDNA electrode were compared. We concluded thatthe HOTDNA electrode was an effective photoelectrode forachieving an enhanced MeO degradation.