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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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de Souza, Michele L. [1] ; Corio, Paola [1]
Total Authors: 2
[1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05513970 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: APPLIED CATALYSIS B-ENVIRONMENTAL; v. 136, p. 325-333, JUN 5 2013.
Web of Science Citations: 42

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 E-gap. 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. (C) 2013 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support type: Research Projects - Thematic Grants
FAPESP's process: 08/03636-5 - Applications of metallic nanocomposites in enhanced photochemical processes: plasmon effects in photocatalysis and photoelectrochemistry
Grantee:Michele Lemos de Souza
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 98/14324-0 - Multidisciplinary Center for Development of Ceramic Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC