Copper Biosorption by Spent Coffee Ground: Equilibrium, Kinetics, and Mechanism

The potential use of spent coffee ground (SCG) for the removal of copper has been investigated as a low‐cost adsorbent for the biosorption of heavy metals. Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Fre...

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Veröffentlicht in:Clean : soil, air, water air, water, 2013-06, Vol.41 (6), p.557-564
Hauptverfasser: Dávila-Guzmán, Nancy Elizabeth, de Jesús Cerino-Córdova, Felipe, Soto-Regalado, Eduardo, Rangel-Mendez, Jose Rene, Díaz-Flores, Paola Elizabeth, Garza-Gonzalez, Maria Teresa, Loredo-Medrano, José Angel
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container_end_page 564
container_issue 6
container_start_page 557
container_title Clean : soil, air, water
container_volume 41
creator Dávila-Guzmán, Nancy Elizabeth
de Jesús Cerino-Córdova, Felipe
Soto-Regalado, Eduardo
Rangel-Mendez, Jose Rene
Díaz-Flores, Paola Elizabeth
Garza-Gonzalez, Maria Teresa
Loredo-Medrano, José Angel
description The potential use of spent coffee ground (SCG) for the removal of copper has been investigated as a low‐cost adsorbent for the biosorption of heavy metals. Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Freundlich model and an experimental maximum biosorption capacity of copper ions 0.214 mmol/g was achieved. The biosorption kinetics of SCG was studied at different adsorbate concentrations (0.1–1.0 mM) and stirring speeds (100–400/min). The results showed an increase in the copper ion uptake with raising the initial metal concentration and the kinetic data followed the pseudo‐second order rate expression. The effect of stirring speed was a significant factor for the external mass transfer resistance at 100/min and coefficients were estimated by the Mathews and Weber model. Biosorption of copper ions onto SCG was observed to be related mainly with the release of calcium and hydrogen ions suggesting that biosorption performance by SCG can be attributed to ion‐exchange mechanism with calcium and hydrogen ions neutralizing the carboxyl and hydroxyl groups of the biomass. From the results of this study, it can be concluded that SCG pretreated with sodium hydroxide has the potential to be used as an effective, and a low‐cost biosorbent material for copper removal from aqueous solutions.
doi_str_mv 10.1002/clen.201200109
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Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Freundlich model and an experimental maximum biosorption capacity of copper ions 0.214 mmol/g was achieved. The biosorption kinetics of SCG was studied at different adsorbate concentrations (0.1–1.0 mM) and stirring speeds (100–400/min). The results showed an increase in the copper ion uptake with raising the initial metal concentration and the kinetic data followed the pseudo‐second order rate expression. The effect of stirring speed was a significant factor for the external mass transfer resistance at 100/min and coefficients were estimated by the Mathews and Weber model. Biosorption of copper ions onto SCG was observed to be related mainly with the release of calcium and hydrogen ions suggesting that biosorption performance by SCG can be attributed to ion‐exchange mechanism with calcium and hydrogen ions neutralizing the carboxyl and hydroxyl groups of the biomass. From the results of this study, it can be concluded that SCG pretreated with sodium hydroxide has the potential to be used as an effective, and a low‐cost biosorbent material for copper removal from aqueous solutions.</description><identifier>ISSN: 1863-0650</identifier><identifier>EISSN: 1863-0669</identifier><identifier>DOI: 10.1002/clen.201200109</identifier><language>eng</language><publisher>Weinheim: WILEY-VCH Verlag</publisher><subject>Batch experiment ; Coffee ; Copper ; Heavy metal ; Kinetics ; Modeling ; Wastewater ; Water pollution</subject><ispartof>Clean : soil, air, water, 2013-06, Vol.41 (6), p.557-564</ispartof><rights>Copyright © 2013 WILEY‐VCH Verlag GmbH &amp; Co. 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Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Freundlich model and an experimental maximum biosorption capacity of copper ions 0.214 mmol/g was achieved. The biosorption kinetics of SCG was studied at different adsorbate concentrations (0.1–1.0 mM) and stirring speeds (100–400/min). The results showed an increase in the copper ion uptake with raising the initial metal concentration and the kinetic data followed the pseudo‐second order rate expression. The effect of stirring speed was a significant factor for the external mass transfer resistance at 100/min and coefficients were estimated by the Mathews and Weber model. Biosorption of copper ions onto SCG was observed to be related mainly with the release of calcium and hydrogen ions suggesting that biosorption performance by SCG can be attributed to ion‐exchange mechanism with calcium and hydrogen ions neutralizing the carboxyl and hydroxyl groups of the biomass. 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Adsorption batch experiments were conducted to determine isotherms and kinetics. The biosorption equilibrium data were found to fit well the Freundlich model and an experimental maximum biosorption capacity of copper ions 0.214 mmol/g was achieved. The biosorption kinetics of SCG was studied at different adsorbate concentrations (0.1–1.0 mM) and stirring speeds (100–400/min). The results showed an increase in the copper ion uptake with raising the initial metal concentration and the kinetic data followed the pseudo‐second order rate expression. The effect of stirring speed was a significant factor for the external mass transfer resistance at 100/min and coefficients were estimated by the Mathews and Weber model. 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subjects Batch experiment
Coffee
Copper
Heavy metal
Kinetics
Modeling
Wastewater
Water pollution
title Copper Biosorption by Spent Coffee Ground: Equilibrium, Kinetics, and Mechanism
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