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Ordered TiO2 nanotubes: The effect of preparation parameters on the photocatalytic activity in air purification process

Paper ID Volume ID Publish Year Pages File Format Full-Text
45406 46410 2014 12 PDF Available
Title
Ordered TiO2 nanotubes: The effect of preparation parameters on the photocatalytic activity in air purification process
Abstract

•TiO2 photocatalysts were synthesized by electrochemical oxidation of titanium foil.•The as-obtained samples possessed a high photocatalytic activity in air treatment process using UV-light-emitting diodes.•Selected samples of ordered TiO2 nanotubes showed high activity and stability in four cycles of toluene degradation under UV-light-emitting diodes.

Vertically ordered TiO2 nanotube arrays were synthesized by anodic oxidation of titanium foil in glycerol, ethylene glycol and water-based electrolytes. The effect of electrolyte composition, anodization voltage, ultrasonic treatment and calcination time on the morphology of the resulting thin films, as well as on their photocatalytic activity in toluene removal, used as a model volatile organic compound, was investigated. Toluene, at the concentration of about 100 ppm, was irradiated over TiO2 nanotube arrays using xenon lamp and light-emitting diodes (LEDs) in four subsequent cycles. The results showed that toluene could be mostly removed from the air after 30 min of irradiation over TiO2 nanotubes (NTs), even using LEDs (375 nm) as a irradiation source. Photoactivity increased with increasing of nanotubes lengths and decreasing of crystallite size. Thus, TiO2 nanotube arrays formed in ethylene glycol-based electrolyte by applying voltage of 40 V, followed by 1-h calcination at 450 °C, revealed the highest photoactivity and may be used several times without any significant decrease in activity.

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Keywords
TiO2 nanotubes; Oxidative anodization; Heterogeneous photocatalysis; Air treatment; LEDs
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 674–685
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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