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Nitrogen-containing TiO2 photocatalysts: Part 2. Photocatalytic behavior under sunlight excitation

Paper ID Volume ID Publish Year Pages File Format Full-Text
49176 46561 2006 6 PDF Available
Title
Nitrogen-containing TiO2 photocatalysts: Part 2. Photocatalytic behavior under sunlight excitation
Abstract

A series of nanosized N-containing TiO2-based materials with Anatase-type structure and synthesized by a microemulsion method were tested in the photocatalytic degradation of methylcyclohexene, a representative example of volatile organic compound (VOC) present in urban atmospheres. A combined diffuse reflectance infrared (DRIFTS) and X-ray absorption (XAS) spectroscopic study allows to analyze the nature and number of N-containing species and other defects (particularly oxygen vacancies) present in the solid catalysts. The structural characterization was used to interpret the UV–vis spectra of the solids and the resulting joint information allows to rationalize the photocatalytic activity differences observed through the samples under sunlight-type excitation. We founded that our samples contain substitutional and interstitial N-containing impurities and a significant number of oxygen vacancies. Photocatalytic activity is correlated with an optimum of oxygen vacancies, above and below which a decrease of the steady state reaction rate is observed. The physico-chemical bases of this behavior are discussed on the light of the above mentioned experimental results.

Keywords
Photocatalysis; Microemulsion method; XAS; DRIFTS; TiO2 Anatase materials; N-doping and impurity; Visible light absorption; Pollutant mineralization and degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 65, Issues 3–4, 6 June 2006, Pages 309–314
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