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Characterization and photoreactivity of N-, S-, and C-doped ZnO under UV and visible light illumination

Paper ID Volume ID Publish Year Pages File Format Full-Text
29076 44118 2008 9 PDF Available
Title
Characterization and photoreactivity of N-, S-, and C-doped ZnO under UV and visible light illumination
Abstract

N-, S-, and C-doped ZnO (N,S,C-ZnO) particles were synthesized from thiourea and zinc sulfate via a precipitation method and were characterized by XRD, XPS, UV–vis spectroscopy, and BET techniques. The photocatalytic activities of the N,S,C-ZnO samples were evaluated by the degradation of acid orange 7 (AO7) and phenol under UV and visible light illumination. XRD results showed that crystallization of the N,S,C-ZnO samples was not well developed after calcination below 700 °C. XPS results suggested that N, S, and C atoms in the samples were predominantly in the bonds of ZnN, ZnS and ZnC after calcination at 500 °C, and were transformed to oxidized forms at 800 °C. UV–vis spectroscopy indicated that dopants N,S,C-species can shift the absorption edge to the visible light region. Incorporating N,S,C-species at appropriate quantities reduced the crystal size and increased the surface area of ZnO samples. The visible light activity of the N,S,C-ZnO samples was confirmed by degradation of phenol. The optimal molar ratios of thiourea to zinc sulfate are 1 and 2 for the highest photocatalytic activities under UV and visible light illumination, respectively. Under visible light illumination, AO7 probably degrades through both the photocatalytic and photosensitized pathways as a result of visible light absorption by N,S,C-ZnO and AO7.

Keywords
Zinc oxide; Thiourea; Photocatalyst; Phenol; Acid orange 7; Visible light
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Characterization and photoreactivity of N-, S-, and C-doped ZnO under UV and visible light illumination
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 199, Issues 2–3, 25 September 2008, Pages 170–178
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
Online Support
Any Questions? feel free to contact us