Green Synthesis of Metal Nanoparticles via Natural Extracts: The Biogenic Nanoparticle Corona and Its Effects on Reactivity

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Title: Green Synthesis of Metal Nanoparticles via Natural Extracts: The Biogenic Nanoparticle Corona and Its Effects on Reactivity
Authors: Metz, Kevin M.Sanders, Stephanie E.Pender, Joshua P.Hinds, David T.Quinn, Susan al.
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Date: 25-May-2015
Online since: 2020-09-29T09:00:19Z
Abstract: The optical and catalytic properties of metal nanoparticles have attracted significant attention for applications in a wide variety of fields, thus prompting interest in developing sustainable synthetic strategies that leverage the redox properties of natural compounds or extracts. Here, we investigate the surface chemistry of nanoparticles synthesized using coffee as a biogenic reductant. Building on our previously developed synthetic protocols for the preparation of silver and palladium nanoparticle/carbon composite microspheres, a combination of thermogravimetric and spectroscopic methods was used to characterize the carbon microsphere and nanoparticle surfaces. Infrared reflectance spectroscopy and single particle surface enhanced Raman spectroscopy were used to characterize Pd and Ag metal surfaces, respectively, following synthesis. Strongly adsorbed organic layers were found to be present at metal nanoparticle surfaces after synthesis. The catalytic activity of Pd nanoparticles in hydrogenation reactions was leveraged to study the availability of surface sites, and coffee-synthesized nanomaterials were compared to commercial Pd-based hydrogenation catalysts. Our results demonstrate that biogenic adsorbates block catalytic surface sites and affect nanoparticle functionality. These findings highlight the need for careful analysis of surface chemistry as it relates to the specific applications of nanomaterials produced using greener or more sustainable methods. (Figure Presented).
Funding Details: Environmental Protection Agency
metadata.dc.description.othersponsorship: Hewlett Mellon Fund for Faculty Development at Albion College (Michigan, USA)
Type of material: Journal Article
Publisher: American Chemical Society
Journal: ACS Sustainable Chemistry and Engineering
Volume: 3
Issue: 7
Start page: 1610
End page: 1617
Copyright (published version): 2015 American Chemical Society
Keywords: CoffeePalladiumSilverNanoparticlesSurface enhanced Raman spectroscopyCatalytic activitySilver nanoparticlesSurface-structureRobustaArabica
DOI: 10.1021/acssuschemeng.5b00304
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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