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Citation: WAN Bin, SHEN Jia-Nian, CHEN Ming-Bo, WANG Dong, ZHANG Xin-Rong, LI Mou-Cheng. TiO₂ Nanotube Prepared via Anodizing and Its Photocatalytic Performance[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 665-668. shu

TiO₂ Nanotube Prepared via Anodizing and Its Photocatalytic Performance

1.
a Institute of Materials, Shanghai University, Shanghai 200072;
2.
b Shanghai Institute of Space Power-source, Shanghai

Corresponding author: WAN Bin,
Received Date: 27 June 2007
Available Online: 28 September 2007
Fund Project: 国家自然科学基金(50471105)资助项目 (50471105)

High density,well ordered,vertically aligned and uniform titanium oxide nanotube arrays were fabricated on the surface of pure titanium sheet by direct electrochemical anodic oxidation with 0.5% HF and 0.5% HF+1 mol/L (NH₄)H₂PO₄ as the supporting electrolyte at 20 V.XRD and SEM techniques were used to characterize titanium oxide nanotube arrays.The XRD result shows that TiO₂ showed the anatase phase after having been annealed for 1 hour under 400℃.SEM shows the length of nanotubes did not increase after reaction for 20 mins in an electrolyte solution of 0.5% HF.But in an electrolyte solution of 0.5% HF+1 mol/L (NH₄)H₂PO₄,at 20 V after reaction for 15 h,the average diameter of nanotubes is about 70~90 nm,and the length of nanotubes is about 2.2 μm.Photo-electrochemical character curves were tested in an electrolyte solution of 1 mol/L KOH under the irradiation of a high-voltage mercury lamp,photocurrent is about 3.5 mA/cm² for nanotubes with a length of 2.2 μm.With TiO₂ nanotubes of 2.2 μm in length as anode,under illuminating of a high-voltage mercury lamp at 0.45 V bias potential,after 4 h,the COD degradation degree of Methylene Blue electrolyte (10 mg/L) is about 93%.
- anodic oxidation,
- TiO₂ nano-tubes,
- mathylene bule,
- photocatalytic decomposition
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TiO₂ Nanotube Prepared via Anodizing and Its Photocatalytic Performance