Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 3, Issue 7, Pages 1610-1617Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.5b00304
Keywords
Coffee; Palladium; Silver; Nanoparticles; Surface enhanced Raman spectroscopy; Catalytic activity
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Funding
- Hewlett Mellon Fund for Faculty Development at Albion College (Michigan, USA)
- Environmental Protection Agency (EPA) Ireland [2008-PhD-WRM-2]
- LSF [1192000]
- Environmental Protection Agency Ireland (EPA) [2008-PhD-WRM-2] Funding Source: Environmental Protection Agency Ireland (EPA)
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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 rnicrospheres, 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.
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