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Microwave-assisted facile green synthesis of silver nanoparticles and spectroscopic investigation of the catalytic activity

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Abstract

Silver nanoparticles have been successfully synthesized in aqueous medium by a green, rapid and cost-efficient synthetic approach based on microwave irradiation. In this study, iota-carrageenan (I-carrageenan) is used both as reducing and stabilizing agent. The formation of nanoparticles is determined using UV–vis, Fourier transform infrared (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray (EDX) and high-resolution-transmission electron microscopic (HR-TEM) analysis. Transmission electron microscopic (TEM) images show that the nanoparticles are of spherical shape with an average diameter of 18.2 nm. I-carrageenan-stabilized silver nanoparticles show outstanding catalytic activity for the reduction of 4-nitrophenol in the presence of NaBH4 in aqueous medium. The reaction follows pseudo-first-order kinetics and the reaction rate increases with the increase in amount of the catalyst. The study of the temperature dependence of reaction rate gives activation energy of 42.81 kJ mol−1. The synthesized silver nanoparticles are anticipated to be a promising material for pollution abatement.

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Acknowledgement

This work was supported by UGC Bangalore, Government of India, under FIP scheme.

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Correspondence to SIBY JOSEPH.

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JOSEPH, S., MATHEW, B. Microwave-assisted facile green synthesis of silver nanoparticles and spectroscopic investigation of the catalytic activity. Bull Mater Sci 38, 659–666 (2015). https://doi.org/10.1007/s12034-015-0892-1

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  • DOI: https://doi.org/10.1007/s12034-015-0892-1

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