fulltext.study @t Gmail

Characterization and photoactivity of coupled ZnO–ZnWO4 catalysts prepared by a sol–gel method

Paper ID Volume ID Publish Year Pages File Format Full-Text
45076 46395 2014 7 PDF Available
Title
Characterization and photoactivity of coupled ZnO–ZnWO4 catalysts prepared by a sol–gel method
Abstract

•ZnO–ZnWO4 nanocomposites were prepared by a facile sol–gel synthesis.•The photoactivity of the samples was studied using the degradation of 4-nitrophenol.•The photocatalytic activity depended on the ZnO/ZnWO4 molar ratio.•The high photoactivity was attributed to the presence of heterojunctions ZnO–ZnWO4.

ZnO–ZnWO4 nanocomposites were synthesized by a novel sol–gel method and characterized through X-ray diffraction, BET specific surface area analysis, UV–Vis diffuse reflectance spectroscopy, scanning electron microscopy and transmission electron microscopy. The photocatalytic activity of the samples was evaluated using the degradation of 4-nitrophenol under UV light as probe reaction. The ZnO/ZnWO4 molar ratio was varied in order to study its influence on the photoefficiency of the mixed samples. The ZnO–ZnWO4 nanocomposites showed higher photoactivity than ZnO and ZnWO4. The high efficiency of the mixed samples was explained by the coupling and the intimate contact of two different semiconductors having suitable energy levels of their conduction and valence bands that allow an improved charge separation of the photogenerated electron–hole pairs.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photocatalysis; ZnO–ZnWO4 nanocomposites; Sol–gel method; Coupled semiconductors
First Page Preview
Characterization and photoactivity of coupled ZnO–ZnWO4 catalysts prepared by a sol–gel method
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 154–155, July–August 2014, Pages 379–385
Authors
, , , , , ,
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