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Substrate development for surface-enhanced Raman study of photocatalytic degradation processes: Congo red over silver modified titanium dioxide films

Paper ID Volume ID Publish Year Pages File Format Full-Text
48738 46520 2006 9 PDF Available
Title
Substrate development for surface-enhanced Raman study of photocatalytic degradation processes: Congo red over silver modified titanium dioxide films
Abstract

A methodology for the investigation of photocatalytic degradation processes of organic molecules involving surface-enhanced Raman spectroscopy (SERS) is developed and applied to the investigation of an azo dye. Initially, the development of substrates to enable SERS to be used for sensitive in situ characterization of photochemical processes in thin-films materials was focused. An optimized method for the preparation of a surface that is altogether photocatalytic (by the presence of semiconducting TiO2) and SERS-active (by the presence of nanostructured silver) was developed. The optimized SERS-active substrate was then employed to study the photodegradation reaction of Congo red. Considering that photocatalytic degradation process of organic molecules adsorbed on TiO2 might involve either their oxidation or reduction reaction, the spectroelectrochemical study of the dye was also performed, in order to clarify the transformations involved in initial steps of its photochemical decomposition. The approach here described involves combination of data relative to the photochemical behavior of dye and its electrochemical study – using enhanced spectroscopic techniques for identification and characterization of products – and proved to be very promising, in the sense of offering relevant information about the complex mechanisms that are involved in photodegradation processes of organic molecules.

Keywords
Environmental photochemistry; Photocatalytic degradation; TiO2; Raman spectroscopy; Congo red; Azo dyes
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Substrate development for surface-enhanced Raman study of photocatalytic degradation processes: Congo red over silver modified titanium dioxide films
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 69, Issues 1–2, 1 December 2006, Pages 34–42
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