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Effect of silver nanoparticles on TiO2-mediated photodegradation of Alizarin Red S

Paper ID Volume ID Publish Year Pages File Format Full-Text
46341 46437 2013 9 PDF Available
Title
Effect of silver nanoparticles on TiO2-mediated photodegradation of Alizarin Red S
Abstract

Titanium oxide (TiO2) is widely employed in photocatalysis and in organic solar cells despite certain efficiency shortcomings regarding the high e−/h+ pair recombination rate and wide Egap. Wet chemistry immobilization of plasmonic Ag NPs onto commercial TiO2 (P25) through a bifunctional linker molecule (3-mercaptopropionic acid) was employed as a strategy to overcome such shortcomings. This paper proposes the main photodegradation excitation mechanisms according to the irradiation energy source. The photodegradation of the textile dye Alizarin Red S (ARS) catalyzed by bare P25 and a P25-Ag composite was studied applying UV/visible and visible radiation. Under UV/visible radiation, the P25-Ag composite showed a 40% improvement in the photodegradation rate constant in comparison to the bare P25, a phenomenon assigned to the charge separation due to the Schottky barrier. After 180 min under visible radiation the ARS degradation was 80%, i.e. low P25 photosensitization, while the P25-Ag composite showed a 7% increase in the percentage degradation of the unsaturated compounds, which was attributed to the plasmonic local field enhancement at the TiO2 surface.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A simple wet chemistry method for immobilization of Ag NPs on the P25 surface leading to a catalytic composite was performed. ► P25-Ag composite photocatalytic efficiency was observed under UV/visible and visible excitation photodegradation of ARS. ► Distinct mechanisms were identified according with the radiation source and the degradation stage. ► Phototensitization and plasmonic effects showed to be incremental on the P25-Ag composite.

Keywords
AOPs; Catalytic photodegradation efficiency; Alizarin Red S; Plasmonic photodegradation
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Effect of silver nanoparticles on TiO2-mediated photodegradation of Alizarin Red S
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 136–137, 5 June 2013, Pages 325–333
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
Online Support
Any Questions? feel free to contact us