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Issue 102, 2016
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Synthesis of catalytically active gold clusters on the surface of Fe3O4@SiO2 nanoparticles

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Abstract

This work proposes a novel method to obtain catalytically active gold clusters by using the water-soluble 5,10,15,20-Tetrakis(4-trimethyl-ammonio-phenyl)porphyrin under mild conditions instead of using strong reducing agents. Uniform gold clusters were obtained with a diameter comprised between 1 and 2 nm and long-term stability. Furthermore, the water-soluble porphyrin was immobilized on the SiO2 shell of a core@shell Fe3O4@SiO2 nanoparticles to directly synthesize gold clusters onto the surface of Fe3O4@SiO2 nanoparticles featuring their magnetic recovery. Fe3O4@SiO2@Au nanoparticles were found to be catalytically active for the reduction of 4-nitrophenol to 4-aminophenol using NaBH4 and giving very high pseudo-first-order rate constant comprised between 0.7 and 2.7 min−1. Our results demonstrate that Fe3O4@SiO2@Au nanoparticles are stable catalysts and do not degrade during the catalytic process under the reaction conditions enabling their magnetic recuperation.

Graphical abstract: Synthesis of catalytically active gold clusters on the surface of Fe3O4@SiO2 nanoparticles

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Publication details

The article was received on 08 Aug 2016, accepted on 17 Oct 2016 and first published on 17 Oct 2016


Article type: Paper
DOI: 10.1039/C6RA20055A
Citation: RSC Adv., 2016,6, 100614-100622
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    Synthesis of catalytically active gold clusters on the surface of Fe3O4@SiO2 nanoparticles

    P. Alonso-Cristobal, M. A. Lopez-Quintela, R. Contreras-Caceres, E. Lopez-Cabarcos, J. Rubio-Retama and M. Laurenti, RSC Adv., 2016, 6, 100614
    DOI: 10.1039/C6RA20055A

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