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Effect of calcination temperature on morphology and photoelectrochemical properties of anodized titanium dioxide nanotube arrays

Paper ID Volume ID Publish Year Pages File Format Full-Text
47697 46480 2010 8 PDF Available
Title
Effect of calcination temperature on morphology and photoelectrochemical properties of anodized titanium dioxide nanotube arrays
Abstract

Highly ordered TiO2 nanotube arrays (TNs) are prepared by electrochemical anodization of titanium foil in a mixed electrolyte solution of glycerol and NH4F and then calcined at various temperatures. The prepared samples are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The photocatalytic activity is evaluated by photocatalytic degradation of methyl orange (MO) aqueous solution under UV light irradiation. The production of hydroxyl radicals (OH) on the surface of UV-irradiated samples is detected by a photoluminescence (PL) technique using terephthalic acid (TA) as a probe molecule. The transient photocurrent response is measured by several on–off cycles of intermittent irradiation. The results show that low temperatures (below 600 °C) have no great influence on surface morphology and architecture of the TNs sample and the prepared TNs can be stable up to ca. 600 °C. At 800 °C, the nanotube arrays are completely destroyed and only dense rutile crystallites are observed. The photocatalytic activity, formation rate of hydroxyl radicals and photocurrent of the TNs increases with increasing temperatures (from 300 to 600 °C) due to the enhancement of crystallization. Especially, at 600 °C, the sample shows the highest photocatalytic activity due to its bi-phase composition, good crystallization and remaining tubular structures. With further increase in the calcination temperature from 600 to 800 °C, the photocatalytic activity rapidly decreases due to the vanishing of anatase phase, collapse of nanotube structures and decrease of surface areas.

Graphical abstractHighly ordered TiO2 nanotube arrays are prepared by electrochemical anodization of titanium foil in a mixed electrolyte solution of glycerol and NH4F and calcination temperatures exhibit a great influence on their architectures and photoelectrochemical properties.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
TiO2 nanotube arrays; Calcination temperature; Photocatalytic activity; Hydroxyl radicals; Photocurrent
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Effect of calcination temperature on morphology and photoelectrochemical properties of anodized titanium dioxide nanotube arrays
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 94, Issues 3–4, 10 February 2010, Pages 295–302
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us