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The effect of MgO coating on photocatalytic activity of SnO2 for the degradation of chlorophenol and textile colorants; the correlation between the photocatalytic activity and the negative shift of flatband potential of SnO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
43974 45998 2007 6 PDF Available
Title
The effect of MgO coating on photocatalytic activity of SnO2 for the degradation of chlorophenol and textile colorants; the correlation between the photocatalytic activity and the negative shift of flatband potential of SnO2
Abstract

SnO2 is a totally inactive photocatalyst for the degradation of 2-chlorophenol (2CP) and textile colorant Mercurochrome (MC) at acidic pH values, but shows feeble photocatalytic activity for the degradation of said pollutants at basic pH values. However, coating of a thin MgO layer on SnO2 nanocrystalline particles transforms photocatalytically inactive SnO2 to an active photocatalyst. A negative shift of the flatband (FB) potential of SnO2 was observed with the increase of pH values and coating of a thin MgO layer on SnO2 particles. Further we noticed the retardation of charge recombination on SnO2 upon MgO coating and increase in pH values. Hence, the promoting effects of MgO layer on SnO2 catalyst for the sensitized degradation of colorants and chlorophenol degradation in aqueous phase were assigned to both slow charge recombination and to the negative shift of FB potential.

Graphical abstractCoating of a thin MgO layer on SnO2 nanocrystalline particles transforms photocatalytically inactive SnO2 to an active photocatalyst. Negative shift of flatband (FB) potential of SnO2 and retardation of charge recombination were observed with coating of a thin MgO layer on SnO2 particles. Hence, the promoting effects of MgO layer on SnO2 catalyst for the degradation of colorants and chlorophenol in aqueous phase were assigned to both slow charge recombination and to the negative shift of FB potential.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Photodegradation; Charge recombination; MgO; SnO2; Mercurochrome; Chlorophenol; Flatband
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The effect of MgO coating on photocatalytic activity of SnO2 for the degradation of chlorophenol and textile colorants; the correlation between the photocatalytic activity and the negative shift of flatband potential of SnO2
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 319, 1 March 2007, Pages 58–63
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