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N, S co-doped and N-doped Degussa P-25 powders with visible light response prepared by mechanical mixing of thiourea and urea. Reactivity towards E. coli inactivation and phenol oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27901 44049 2009 7 PDF Available
Title
N, S co-doped and N-doped Degussa P-25 powders with visible light response prepared by mechanical mixing of thiourea and urea. Reactivity towards E. coli inactivation and phenol oxidation
Abstract

Degussa P-25 powder was mixed mechanically with thiourea and urea and then annealed during 1 h at 400 °C. Diffuse reflectance spectroscopy (DRS) revealed that treated powders absorb visible light (between 400 and 550 nm) and by Kubelka–Munk relations it was possible to estimate their band-gap energies, being 2.85 and 2.73 eV to thiourea and urea treated powders, respectively. X-ray photoelectron spectroscopy (XPS) showed in the case of thiourea treated P-25, hints of interstitial N-doping and anionic S-doping. On the other hand, P-25 treated with urea showed only the presence of interstitial N-doping. Atomic concentrations measured by XPS showed highest content of N species on TiO2 surfaces in urea treated P-25 (2.7 at%) while thiourea treated powders presented low concentrations of N and S (0.61 and 0.68 at%, respectively). Specific surface area (SSA) was measured by BET method, obtaining values of 52 and 46 m2 g−1 for undoped P-25 and undoped P-25 annealed at 400 °C during 1 h. N, S co-doped and N-doped P-25 showed SSA of 42 and 40 m2 g−1, respectively. We suggest that probably OH radical is not directly involved in oxidative processes taking place when N, S co-doped Degussa P-25 was exposed to visible light.

Keywords
Heterogeneous TiO2 photocatalysis; Visible light response; Nitrogen and sulfur doping; Degussa P-25
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N, S co-doped and N-doped Degussa P-25 powders with visible light response prepared by mechanical mixing of thiourea and urea. Reactivity towards E. coli inactivation and phenol oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 205, Issues 2–3, 25 June 2009, Pages 109–115
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