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MIL-53(Fe)-graphene nanocomposites: Efficient visible-light photocatalysts for the selective oxidation of alcohols

Paper ID Volume ID Publish Year Pages File Format Full-Text
44721 46344 2016 12 PDF Available
Title
MIL-53(Fe)-graphene nanocomposites: Efficient visible-light photocatalysts for the selective oxidation of alcohols
Abstract

•MIL-53(Fe)-graphene nanocomposites were efficient catalysts toward the photocatalytic selectively oxidation of alcohols.•Intimate interfacial contact between the MIL-53(Fe) and the GR could improve the photon-generated carrier transfer and inhibit the recombination of the photo electron-hole.•Direct photogenerated hole-oxidation process for the selectively oxidation of alcohols under visible illuminated ambient conditions was carried out.•High selectivity of the aldehydes or ketones were obtained by the direct hole oxidation process.

A series of MIL-53(Fe)-graphene nanocomposite photocatalysts were synthesized by a facile one-pot solvothermal reaction. All materials have been thoroughly characterized by FT-IR, SEM, TEM, PXRD, UV–vis DRS and PL analysis. It was demonstrated that the introducing of graphene on the MIL-53(Fe) would minimize the recombination of photogenerated electron-hole pairs, thus, leading to the enhancement of photocatalytic activity. MIL-53(Fe)-graphene nanocomposite was an efficient catalyst towards the photocatalytic selectively oxidation of alcohols to the corresponding aldehydes or ketones under visible light and ambient conditions. High selectivity of the aldehydes or ketones (99%) were obtained. Meanwhile, the catalyst can be recycled at least four times without loss of catalytic efficiency. A possible photocatalytic reaction mechanism involving a direct photogenerated hole-oxidation process was also investigated in detail by the active species trapping experiments and the related electrochemical analysis.

Graphical abstractA series of MIL-53(Fe)-graphene nanocomposites photocatalysts were synthesized by a facile one-pot solvothermal reaction. MIL-53(Fe)-graphene nanocomposites were efficient catalysts toward the photocatalytic selectively oxidation of alcohols to aldehydes or ketones under visible light and ambient conditions. Introducing of graphene to the MIL-53(Fe) minimized the recombination of photogenerated electron-hole pairs, leading to the enhancement of photocatalytic activity. A possible photocatalytic reaction mechanism, direct photogenerated hole oxidation process, was also investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
MIL-53(Fe); Graphene; Visible light photocatalysis; Direct hole oxidation; Alcohol oxidation
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MIL-53(Fe)-graphene nanocomposites: Efficient visible-light photocatalysts for the selective oxidation of alcohols
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 198, 5 December 2016, Pages 112–123
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