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The Role of Exhausted Coffee Compounds on Metal Ions Sorption

In the present work, the role of chemical compounds of one abundant vegetable waste, exhausted coffee, on Cr(VI), Cu(II), and Ni(II) sorption has been investigated. For this purpose, exhausted coffee was subjected to sequential extractions by using dichloromethane (DCM), ethanol (EtOH), water, and NaOH 1 %. The raw and treated biomass resulting from the extractions were used for metal ions sorption. Sorption results were discussed taking into consideration polarity and functional groups of raw and treated biomass. In general, the successive removal of extractives led to an insignificant increase in the studied metal ions sorption after DCM, EtOH, and water. The sorption results using free-extractive materials showed that metal sorption can be effectively achieved without this non-structural fraction of the sorbent. Alkaline hydrolysis destroyed in part the structural compounds of the sorbent resulting in an insignificant decrease of chromium removal while a significant increase of copper and nickel sorption was observed. The determination of elemental ratios of exhausted coffee and all treated biomass evidenced the involvement of oxygen functional groups in copper and nickel sorption. FTIR analysis confirmed the involvement of lignin moieties in the chromium sorption by exhausted coffee. As a final remark, this study shows that the sequential extraction opens new expectations to the total valorisation of lignocellulosic-based biomasses. The extractives can be removed and used as a biosource of valuable compounds, and the resulting waste can be used as a sorbent for metal ions keeping the same capacity for metal sorption as the non-extracted biomass

This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2012-37215-C02-01. The authors were financially supported by a fellowship from Chinese Scholarship Council [2011] 3005 and by the Spanish Ministry of Education, Culture and Sport (MHE2011-00258)

© Water, Air, and Soil Pollution, 2015, vol. 226, núm. 9, 10 p.

Springer Verlag

Author: Liu, Chang
Pujol Oriola, David
Olivella Costa, Àngels
Torre Yugueros, Florencio de la
Fiol Santaló, Núria
Poch Garcia, Jordi
Villaescusa Gil, Isabel
Date: 2015 September
Abstract: In the present work, the role of chemical compounds of one abundant vegetable waste, exhausted coffee, on Cr(VI), Cu(II), and Ni(II) sorption has been investigated. For this purpose, exhausted coffee was subjected to sequential extractions by using dichloromethane (DCM), ethanol (EtOH), water, and NaOH 1 %. The raw and treated biomass resulting from the extractions were used for metal ions sorption. Sorption results were discussed taking into consideration polarity and functional groups of raw and treated biomass. In general, the successive removal of extractives led to an insignificant increase in the studied metal ions sorption after DCM, EtOH, and water. The sorption results using free-extractive materials showed that metal sorption can be effectively achieved without this non-structural fraction of the sorbent. Alkaline hydrolysis destroyed in part the structural compounds of the sorbent resulting in an insignificant decrease of chromium removal while a significant increase of copper and nickel sorption was observed. The determination of elemental ratios of exhausted coffee and all treated biomass evidenced the involvement of oxygen functional groups in copper and nickel sorption. FTIR analysis confirmed the involvement of lignin moieties in the chromium sorption by exhausted coffee. As a final remark, this study shows that the sequential extraction opens new expectations to the total valorisation of lignocellulosic-based biomasses. The extractives can be removed and used as a biosource of valuable compounds, and the resulting waste can be used as a sorbent for metal ions keeping the same capacity for metal sorption as the non-extracted biomass
This research was funded by the Spanish Ministry of Science and Innovation as part of the projects CTM2010-15185 and CTM2012-37215-C02-01. The authors were financially supported by a fellowship from Chinese Scholarship Council [2011] 3005 and by the Spanish Ministry of Education, Culture and Sport (MHE2011-00258)
Format: application/pdf
ISSN: 0049-6979 (versió paper)
1573-2932 (versió electrònica)
Document access: http://hdl.handle.net/10256/10940
Language: eng
Publisher: Springer Verlag
Collection: MINECO/PN 2013-2015/CTM2012-37215-C02-01
MICINN/PN 2011-2013/CTM2010-15185
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s11270-015-2568-2
Articles publicats (D-EQATA)
Is part of: © Water, Air, and Soil Pollution, 2015, vol. 226, núm. 9, 10 p.
Rights: Tots els drets reservats
Subject: Metalls -- Absorció i adsorció
Metals -- Absorption and adsorption
Elements químics -- Absorció i adsorció
Chemical elements -- Absorption and adsorption
Title: The Role of Exhausted Coffee Compounds on Metal Ions Sorption
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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