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Issue 9, 2013
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Bio-inspired fabrication of silver nanoparticles on nanostructured silica: characterization and application as a highly efficient hydrogenation catalyst

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Abstract

The design and facile green synthesis of supported metal-engineered nanoparticles with efficient catalytic activity has significant industrial importance. A biosynthetic and ecofriendly one-step reduction strategy has been developed through the protein-mediated in vitro biosynthesis of AgNPs on the surface of nanosilica. The as-synthesized silver nanoparticles supported on nanosilica (Ag@Nanosilica) were characterized by field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDXA) elemental mapping, high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The spectroscopic and electron microscopic studies demonstrated that the immobilized protein on the nanosilica surface served as a reducing, capping and stabilising agent, while sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis revealed that the three proteins of 48, 38 and 36 kDa participated in the formation of Ag@Nanosilica material. The formation mechanism of AgNPs on nanosilica explained the origin of the biomineralization of metal nanoparticles in nature. The novel reusable Ag@Nanosilica exhibited enhanced catalytic activity for the hydrogenation of a model compound, namely, 4-nitrophenol. Overall our results will help to understand metal nanoparticle formation in the Earth’s crust and aid the design of “green” syntheses of novel nanoreactors.

Graphical abstract: Bio-inspired fabrication of silver nanoparticles on nanostructured silica: characterization and application as a highly efficient hydrogenation catalyst

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Publication details

The article was received on 12 Feb 2013, accepted on 26 Jun 2013 and first published on 27 Jun 2013


Article type: Paper
DOI: 10.1039/C3GC40310F
Citation: Green Chem., 2013,15, 2548-2557
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    Bio-inspired fabrication of silver nanoparticles on nanostructured silica: characterization and application as a highly efficient hydrogenation catalyst

    S. K. Das, Md. M. R. Khan, A. K. Guha and N. Naskar, Green Chem., 2013, 15, 2548
    DOI: 10.1039/C3GC40310F

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