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The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
48166 46496 2008 7 PDF Available
Title
The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition
Abstract

Nanosized TiO2 photocatalysts were synthesized via hydrogen–air flame hydrolysis. X-ray diffraction (XRD) measurements revealed that the TiO2 samples thus prepared consisted mainly of anatase (79–98 wt%) and the rest is rutile. Average particle diameters from TEM measurements were found to vary between 48 and 63 nm. The specific surface area of the samples was found to be practically independent of the synthesis parameters employed (20–32 m2 g−1). Photocatalytic activity of the catalysts was studied by using various model compounds. In spite of their very similar properties, the initial decomposition rate of phenol and methanol showed up to threefold variations within the series of the samples, and it was significantly higher for the best catalyst than that determined for Degussa P25. Our TEM measurements demonstrated that in the less active catalysts the dominant morphology of the particles is spherical, while polyhedral (cubic or hexagonal) shapes predominate in the samples with superior photocatalytic activity. From these observations, we concluded, that the shape of the primary particles (both in the case of our home made ones and in various batches of Degussa P25) strongly influence the photocatalytic activity of titania nanoparticles.

Keywords
Titania; Anatase; Rutile; Nanoparticles; Phenol decomposition; Photocatalysis; TEM; SEM; HRTEM; Powder XRD; Specific surface area; Flame hydrolysis; Shape dependence
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The effect of particle shape on the activity of nanocrystalline TiO2 photocatalysts in phenol decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 84, Issues 3–4, 1 December 2008, Pages 356–362
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
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Any Questions? feel free to contact us