Item


Modelling synergistic sorption of Cr(VI), Cu(II) and Ni(II) onto exhausted coffee wastes from binary mixtures Cr(VI)-Cu(II) and Cr(VI)-Ni(II)

Simultaneous sorption of Cr(VI), Cu(II) and Ni(II) onto exhausted coffee waste from binary mixtures was investigated. Equilibrium studies were carried out in binary mixtures in which Cr(VI) and the second metal ion concentration was varied between 0.5 and 12. mM and 0.5 and 8. mM, respectively. Equilibrium isotherms for each metal of the binary mixtures were determined by fixing the initial concentration of the second metal ion. Results showed that both components of the binary mixture exert a synergistic effect on each other. The best fit for Cr(VI) experimental data was provided by the Sips isotherm model while the Langmuir isotherm was the most effective to fit Cu(II) and Ni(II) experimental data. A multi-component model based on Sips and Langmuir isotherms models has been developed for describing the cooperative effect between the components of Cr(VI)-Cu(II) and Cr(VI)-Ni(II) binary mixtures. The proposed model fits successfully the experimental data. The relationships between variables of the sorption process determined in this work allow calculating both Cr(VI) and Cr(III) concentration at equilibrium and estimating a break concentration from which Cr(VI) appears in solution. The present work could be helpful for the design and prediction of sorption processes performance especially when chromium is forming a binary mixture with metal cations and its sorption is in part or totally based on its reduction to the trivalent form

This work has been supported by Ministerio de Ciencia e Innovación, Spain, project CTM2008-06776-C02-01. D. Pujol was financially supported by a grant from Universitat de Girona (BR 10/09)

© Chemical Engineering Journal, 2013, vol. 230, p. 396-405

Elsevier

Author: Pujol Oriola, David
Bartrolí Alabau, Marc
Fiol Santaló, Núria
Torre Yugueros, Florencio de la
Villaescusa Gil, Isabel
Poch Garcia, Jordi
Date: 2013
Abstract: Simultaneous sorption of Cr(VI), Cu(II) and Ni(II) onto exhausted coffee waste from binary mixtures was investigated. Equilibrium studies were carried out in binary mixtures in which Cr(VI) and the second metal ion concentration was varied between 0.5 and 12. mM and 0.5 and 8. mM, respectively. Equilibrium isotherms for each metal of the binary mixtures were determined by fixing the initial concentration of the second metal ion. Results showed that both components of the binary mixture exert a synergistic effect on each other. The best fit for Cr(VI) experimental data was provided by the Sips isotherm model while the Langmuir isotherm was the most effective to fit Cu(II) and Ni(II) experimental data. A multi-component model based on Sips and Langmuir isotherms models has been developed for describing the cooperative effect between the components of Cr(VI)-Cu(II) and Cr(VI)-Ni(II) binary mixtures. The proposed model fits successfully the experimental data. The relationships between variables of the sorption process determined in this work allow calculating both Cr(VI) and Cr(III) concentration at equilibrium and estimating a break concentration from which Cr(VI) appears in solution. The present work could be helpful for the design and prediction of sorption processes performance especially when chromium is forming a binary mixture with metal cations and its sorption is in part or totally based on its reduction to the trivalent form
This work has been supported by Ministerio de Ciencia e Innovación, Spain, project CTM2008-06776-C02-01. D. Pujol was financially supported by a grant from Universitat de Girona (BR 10/09)
Format: application/pdf
ISSN: 1385-8947
Document access: http://hdl.handle.net/10256/11972
Language: eng
Publisher: Elsevier
Collection: MEC/PN 2009-2012/CTM2008-06776-C02-01
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.cej.2013.06.033
Articles publicats (D-EQATA)
Is part of: © Chemical Engineering Journal, 2013, vol. 230, p. 396-405
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: Modelling synergistic sorption of Cr(VI), Cu(II) and Ni(II) onto exhausted coffee wastes from binary mixtures Cr(VI)-Cu(II) and Cr(VI)-Ni(II)
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

Subjects

Authors