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N and N,S-doped TiO2 photocatalysts and their activity in NOx oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
55024 47038 2013 6 PDF Available
Title
N and N,S-doped TiO2 photocatalysts and their activity in NOx oxidation
Abstract

N-doped and N,S-codoped titania powders were prepared applying simple chemical treatment with various modifiers. The N and S were introduced preserving the crystalline structure, morphology and specific surface area of the initial TiO2. The level of N, S doping varied depending on the modifier two of which were structural isomers. In all samples, N was found interstitially incorporated in the TiO2 lattice. S was recorded in ionic states S6+ and S4+. All modified powders exhibited enhanced visible light absorption and narrower energy band gap in comparison to the initial titania. Except for the N-doped titania, the photocatalytic activity in NOx oxidation under UV light decreased after doping, while the activity under visible light did not increase for all modified samples. This outcome was related to the high level of N and S doping and intense e−–h+ recombination on dopants’ sites. The activity of the photocatalysts in NOx oxidation processes was also connected to the type of non-metal dopant in the lattice of TiO2. The beneficial effect of N-doping was ascribed to the preferential formation of OH species on N-doped surface, whereas the detrimental effect of N,S-codoping was credited to the suppressed OH production on S-doped surface.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (132 K)Download as PowerPoint slideHighlights► N and N,S-doped TiO2 exhibited enhanced visible light absorbance and Eg narrowing. ► Enhanced visible light absorption can not imply increased activity under visible light. ► N, S level of doping and OH formation are essential for NOx oxidation. ► Presence of N is beneficial for NOx oxidation due to preferable OH formation. ► Presence of S is unfavorable for NOx oxidation due to reduction of OH to water.

Keywords
TiO2 nanoparticles; N, S-doping; Visible light; NOx; Photocatalysis
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N and N,S-doped TiO2 photocatalysts and their activity in NOx oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 209, 15 June 2013, Pages 41–46
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