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Green Synthesis of Metal Nanoparticles via Natural Extracts: The Biogenic Nanoparticle Corona and Its Effects on Reactivity
Date Issued
2015-05-25
Date Available
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).
Sponsorship
Environmental Protection Agency
Other Sponsorship
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
Language
English
Status of Item
Peer reviewed
ISSN
2168-0485
This item is made available under a Creative Commons License
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