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Two-step synthesis of a novel visible-light-driven K2Ta2O6−xNx catalyst for the pollutant decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
29227 44134 2008 9 PDF Available
Title
Two-step synthesis of a novel visible-light-driven K2Ta2O6−xNx catalyst for the pollutant decomposition
Abstract

Visible-light-driven K2Ta2O6−xNx catalysts have been synthesized successfully from N-doped Ta2O5 precursors in KOH solutions by a simple hydrothermal process. K2Ta2O6−xNx with pyrocrhore structure could be obtained at above 160 °C for 24 h. K2Ta2O6−xNx crystals presented cube-shaped morphologies, and absorbed the visible-light up to the wavelength of 600 nm. The as-prepared sample could decompose formaldehyde efficiently under the visible irradiation (λ > 400 nm), and its photocatalytic activity depended on the N-doping content and the hydrothermal temperature. K2Ta2O5.982N0.018 prepared at 220 °C for 24 h showed the highest photoactivity for the formaldehyde degradation. Additionally, it presented much higher activity than that of the sample prepared by the NH3 annealing directly. The visible-light response of K2Ta2O6−xNx catalyst could be closely related to the N-doping content. As the x values were >0.256, the valence-band of the catalyst was composed of the hybrid O 2p and N 2p orbitals, and the visible-light sensitivity was due to the narrowing of the band-gap by mixing the N 2p and O 2p states. However, as the x values were <0.073, the isolated narrow band formed above the valence-band of O 2p was responsible for the visible-light response.

Keywords
Photocatalytic; N-doping; K2Ta2O6; Two-step synthesis; Hydrothermal process; Formaldehyde
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Two-step synthesis of a novel visible-light-driven K2Ta2O6−xNx catalyst for the pollutant decomposition
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 193, Issue 1, 1 January 2008, Pages 33–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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