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Issue 11, 2017
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Synthesis of double-shell hollow magnetic Au-loaded ellipsoids as highly active and recoverable nanoreactors

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Abstract

Herein, a novel combined strategy was developed for the preparation of double-shell hollow magnetic ultra-small Au-loaded ellipsoids (Fe@MO2–Au@H–SiO2) as powerful nanoreactors; these ellipsoids comprised double mesoporous shell structures, CeO2 or TiO2 inner active yolks, plenty of sub-3 nm Au nanoparticles (NPs), and magnetic Fe cores. The hierarchical yolk–shell architectures with ellipsoidal Fe2O3@MO2 (M: Ce or Ti)/mSiO2 as yolks/shells were fabricated first via a facile bottom-up assembly process based on sol–gel reactions. After this, encapsulation of numerous extremely stable Au NPs within the shell structures was accomplished via a two-stage reduction process based on the unique deposition–precipitation method mediated with Au(en)2Cl3 compounds; moreover, strong magnetism was integrated into the ellipsoids and inner voids were formed due to the transformation of Fe2O3 into smaller magnetic Fe. Note that ethylenediamine was used as a ligand to synthesize the stable gold precursors [Au(en)2]3+ that were chemically modified onto the double ellipsoidal shells under alkaline conditions. Due to their superior structural properties and enhanced composite synergy, the Fe@MO2–Au@H–SiO2 ellipsoids, especially Fe@CeO2–Au@SiO2, were shown as a highly efficient and recoverable nanocatalysts with outstanding activity and reusability in catalyzing the reduction of 4-nitrophenol to 4-aminophenol.

Graphical abstract: Synthesis of double-shell hollow magnetic Au-loaded ellipsoids as highly active and recoverable nanoreactors

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Publication details

The article was received on 22 Jan 2017, accepted on 24 Apr 2017 and first published on 25 Apr 2017


Article type: Paper
DOI: 10.1039/C7NJ00275K
Citation: New J. Chem., 2017,41, 4448-4457
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    Synthesis of double-shell hollow magnetic Au-loaded ellipsoids as highly active and recoverable nanoreactors

    J. Fang, Y. Zhang, Y. Zhou, S. Zhao, C. Zhang, M. Huang, Y. Gao and C. Yang, New J. Chem., 2017, 41, 4448
    DOI: 10.1039/C7NJ00275K

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