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In situ growth of gold nanoparticles onto polydopamine-encapsulated magnetic microspheres for catalytic reduction of nitrobenzene

Paper ID Volume ID Publish Year Pages File Format Full-Text
45764 46422 2013 8 PDF Available
Title
In situ growth of gold nanoparticles onto polydopamine-encapsulated magnetic microspheres for catalytic reduction of nitrobenzene
Abstract

A simple and green method for the deposition of gold nanoparticles (Au NPs) on the surface of polydopamine (PDA)-encapsulated Fe3O4 nanoparticles is proposed to fabricate a core–shell Fe3O4@PDA–Au nanocatalyst. In the current approach, Fe3O4 core, about 400 nm in diameter, is enveloped in a PDA coating with a thickness of about 45 nm on which plenty of small Au NPs are immobilized subsequently. PDA serves as a reductant as well as a stabilizer so that additional reagents and thermo treatment are not necessary. In addition, both the size of Au NPs and the thickness of PDA layer are tunable to load more Au NPs with appropriate size on the PDA coating. The Au content on Fe3O4@PDA–Au nanocomposites is about 4.3 wt.%, which endows the nanocatalyst with high catalytic performance in the reduction of o-nitroaniline to benzenediamine by NaBH4 (with a conversion of 99% in 7 min). Most importantly, the catalyst can be easily recycled by using an external magnetic field due to the high magnetization (39.6 emu g−1) and shows excellent reusability (8 cycles with a conversion of >98% for o-nitroaniline). The as-prepared catalyst also show good activity for the reduction of other nitrobenzene analogs. These facilitate the practical application of the catalyst in reduction of nitroaromatic compounds.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A core–shell Fe3O4@PDA–Au nanocatalyst was prepared by a simple and green method. ► PDA serves as a reductant as well as a stabilizer for the deposition of Au NPs. ► The concentration of the precursor controls the size and amount of Au NPs. ► The catalyst shows high catalytic activity and reusability in the reduction of o-NA.

Keywords
Gold nanoparticles; Magnetic microspheres; Dopamine; Catalyst; Nitrobenzene
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In situ growth of gold nanoparticles onto polydopamine-encapsulated magnetic microspheres for catalytic reduction of nitrobenzene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volumes 134–135, 2 May 2013, Pages 26–33
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