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

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 vitrobiosynthesis of AgNPs on the s...

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Published in:Green chemistry : an international journal and green chemistry resource : GC 2013-01, Vol.15 (9), p.2548-2557
Main Authors: DAS, Sujoy K, KHAN, Md. Motiar R, GUHA, Arun K, NASKAR, Nityananda
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Catalytic activity
Chemistry
Design engineering
Exact sciences and technology
General and physical chemistry
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Silver
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
X-rays
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Summary: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 vitrobiosynthesis of AgNPs on the surface of nanosilica. The as-synthesized silver nanoparticles supported on nanosilica (Ag[at]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[at]Nanosilica material. The formation mechanism of AgNPs on nanosilica explained the origin of the biomineralization of metal nanoparticles in nature. The novel reusable Ag[at]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.
ISSN:1463-9262
1463-9270
DOI:10.1039/c3gc40310f