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Article

Coffee Grounds-Derived CNPs for Efficient Cr(VI) Water Remediation

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Department of Biological and Environmental Sciences and Technologies, DISTEBA, University of Salento, Via per Arnesano, I-73100 Lecce, Italy
2
Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
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Department of Engineering for Innovation, University of Salento, Via per Monteroni, I-73100 Lecce, Italy
4
Department of Cultural Heritage, University of Salento, Via D. Birago, 48, I-73100 Lecce, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Constantine D. Stalikas
Nanomaterials 2021, 11(5), 1064; https://doi.org/10.3390/nano11051064
Received: 23 March 2021 / Revised: 14 April 2021 / Accepted: 17 April 2021 / Published: 21 April 2021
(This article belongs to the Special Issue Synthesis, Functionalization and Applications of Nanocarbons)
Carbon nanomaterials are a group of materials characterized by sp2/sp3 carbon backbone which, combined with surface atoms and/or chemical groups, ensures peculiar physical chemical features for a wide range of applications. Among these materials, carbon dots and carbon nanoparticles belong to carbon nanomaterials with a few nanometer dimensions. In this work, carbon nanoparticles were produced from spent coffee grounds as sustainable carbon source through a simple, cheap and eco-friendly procedure according to an oxidation process (at controlled temperature) driven by hydrogen peroxide. Atomic Force Microscope (AFM) and fluorescence, UV-Vis absorption, FT-IR and Raman spectroscopy were used to assess the formation of carbon nanomaterials of about 10 nm with the typical emission and absorption properties of carbon dots and peculiar surface features. In fact, the presence of heteroatoms, i.e., phosphorus, and the carbonyl/carboxyl surface groups on carbon nanoparticles, was proposed to confer peculiar properties allowing the fast Mn(VII) reduction to Mn(II) at neutral pH and the Cr(VI) reduction to Cr(III) in weak acid aqueous media. View Full-Text
Keywords: carbon dots; carbon nanoparticles; Cr(VI) remediation; hexavalent chromium; spent coffee grounds carbon dots; carbon nanoparticles; Cr(VI) remediation; hexavalent chromium; spent coffee grounds
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MDPI and ACS Style

Bettini, S.; Ottolini, M.; Pagano, R.; Pal, S.; Licciulli, A.; Valli, L.; Giancane, G. Coffee Grounds-Derived CNPs for Efficient Cr(VI) Water Remediation. Nanomaterials 2021, 11, 1064. https://doi.org/10.3390/nano11051064

AMA Style

Bettini S, Ottolini M, Pagano R, Pal S, Licciulli A, Valli L, Giancane G. Coffee Grounds-Derived CNPs for Efficient Cr(VI) Water Remediation. Nanomaterials. 2021; 11(5):1064. https://doi.org/10.3390/nano11051064

Chicago/Turabian Style

Bettini, Simona, Michela Ottolini, Rosanna Pagano, Sudipto Pal, Antonio Licciulli, Ludovico Valli, and Gabriele Giancane. 2021. "Coffee Grounds-Derived CNPs for Efficient Cr(VI) Water Remediation" Nanomaterials 11, no. 5: 1064. https://doi.org/10.3390/nano11051064

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