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Photocatalytic oxidation of ethanol vapors under visible light on CdS–TiO2 nanocatalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
27870 44047 2012 7 PDF Available
Title
Photocatalytic oxidation of ethanol vapors under visible light on CdS–TiO2 nanocatalyst
Abstract

The preparation of multiphase CdS/TiO2 photocatalysts by the deposition of cadmium sulfide nanoparticles on the surface of commercial titania Hombifine N and Degussa P25 in the presence of a chelating agent (ammonia) was carried out. The photocatalysts were characterized by a wide range of experimental techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM) combined with energy-dispersive X-ray (EDX) spectroscopy, X-ray fluorescence (XRF) spectroscopy, and UV/VIS spectroscopy. The photocatalytic activity was tested in the reaction of ethanol gas-phase oxidation under visible light irradiation (λ > 420 nm) in a batch reactor. The deposition of cadmium sulfide on the surface of anantase/rutile titania Degussa P25 was found to produce higher activity in comparison to the deposition on anatase Hombifine N. The good stability and activity of the multiphase system seem to be caused by the formation of hetero-junctions between CdS and TiO2 nanoparticles resulting in the efficient charge separation and decreased electron–hole recombination.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Preparation of CdS/TiO2 photocatalysts was carried out. ► CdS/TiO2 photocatalysts are active in gas phase ethanol oxidation under visible light. ► Deposition of CdS on Degussa P25 is better in comparison to deposition on Hombifine N. ► Quantum efficiency 2.7% at 420 nm was achieved.

Keywords
Photocatalytic oxidation; Multiphase photocatalysts; CdS/TiO2; Ethanol
First Page Preview
Photocatalytic oxidation of ethanol vapors under visible light on CdS–TiO2 nanocatalyst
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 250, 15 December 2012, Pages 103–109
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering