Issue 1, 2010
From the journal:

Green Chemistry

High performance magnetic separation of gold nanoparticles for catalyticoxidation of alcohols†

Rafael L. Oliveira,a   Pedro K. Kiyoharab  and  Liane M. Rossi*a  

* Corresponding authors

a Instituto de Química, Universidade de São Paulo, 05508-000, São Paulo, SP, Brazil
E-mail: lrossi@iq.usp.br
Fax: +55 11 3815 5579
Tel: +55 11 30912181

b Instituto de Física, Universidade de São Paulo, São Paulo, SP, Brazil

Abstract

We present the magnetic separation approach to facilitate the recovery of gold nanoparticle (AuNP) catalysts. The use of magnetically recoverable supports for the immobilization of AuNPs instead of traditional oxides, polymers or carbon based solids guarantees facile, clean, fast and efficient separation of the catalyst at the end of the reaction cycle. Magnetic separation can be considered an environmentally benign separation approach, since it minimizes the use of auxiliary substances and energy for achieving catalyst recovery. The catalyst preparation is based on the immobilization of Au3+ on the surface of core–shell silica-coated magnetite nanoparticles, followed by metal reduction using two different methods. AuNPs were prepared by thermal reduction in air and by hydrogen reduction at mild temperature. Interestingly, the mean particle size of the supported AuNPs was similar (ca. 5.9 nm), but the polydispersity of the samples is quite different. The catalytic activity of both catalysts in the aerobic oxidation of alcohols was investigated and a distinct selectivity for benzyl alcohol oxidation was observed.

Graphical abstract: High performance magnetic separation of gold nanoparticles for catalytic oxidation of alcohols

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Article information

DOI
https://doi.org/10.1039/B916825G
Article type
Paper
Submitted
14 Aug 2009
Accepted
30 Sep 2009
First published
29 Oct 2009

Green Chem., 2010,12, 144-149

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High performance magnetic separation of gold nanoparticles for catalytic oxidation of alcohols

R. L. Oliveira, P. K. Kiyohara and L. M. Rossi, Green Chem., 2010, 12, 144 DOI: 10.1039/B916825G

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