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Visible light-driven iodine-doped titanium dioxide nanotubes prepared by hydrothermal process and post-calcination

Paper ID Volume ID Publish Year Pages File Format Full-Text
42193 45914 2010 6 PDF Available
Title
Visible light-driven iodine-doped titanium dioxide nanotubes prepared by hydrothermal process and post-calcination
Abstract

A novel class of iodine-doped TiO2 nanotubes (I-TNTs) has been synthesized via a hydrothermal route using Degussa P25 as a precursor and subsequent calcination. The photocatalytic ability of the products was evaluated in terms of phenol degradation in an aqueous solution under visible light irradiation. The structural properties of the catalysts were characterized by X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance spectra. According to the XRD data, I-TNTs are pure anatase, revealing a shift of crystallite phase for P25 from rutile to anatase. The surface area of I-TNTs is significantly larger than that of I-doped TiO2 (I-TiO2) nanoparticles, which is an important advantage of the photocatalysts formed with a hydrothermal procedure. XPS and UV–vis spectroscopy show that iodine was incorporated into the TiO2 lattice, and such incorporation extends the photoresponse of TiO2 from UV to the visible light region. As far as phenol degradation is concerned, the I-TNTs are clearly superior to I-TiO2 nanoparticles, pure TNTs and P25. The photocatalytic activity of I-TNTs hydrothermally synthesized at 150 °C had a significantly higher level than that synthesized at 200 °C. This is attributed to the increase of reactive sites and the enhancement of mass transfer that result from the large surface areas associated with the tubular morphology. Additionally, the increase of Ti3+ content also contributes to the improvement of photocatalytic activity of I-TNTs.

Graphical abstractIodine-doped TiO2 nanotubes (I-TNTs) were synthesized, characterized and evaluated in the photocatalytic degradation of phenol. The photocatalytic activity of these new I-TNTs is much greater than that of I-doped TiO2 nanoparticles, pure TNTs and P25 under visible light irradiation, and the I-TNTs hydrothermally synthesized at 150 °C are superior to those synthesized at 200 °C.Figure optionsDownload full-size imageDownload high-quality image (188 K)Download as PowerPoint slide

Keywords
Titanium dioxide; Iodine; Nanotube; Hydrothermal treatment; Photocatalysis
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Visible light-driven iodine-doped titanium dioxide nanotubes prepared by hydrothermal process and post-calcination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 378, Issue 2, 30 April 2010, Pages 169–174
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