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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33000

Title: Biosorption kinetics of Cd(II), Cr(III) and Pb(II) in aqueous solutions by olive stone
Authors: Calero de Hoces, Mónica
Hernáinz Bermúdez de Castro, Francisco
Blázquez García, Gabriel
Martín-Lara, María de los Ángeles
Tenorio Rivas, Germán
Issue Date: 2009
Abstract: A by-product from olive oil production, olive stone, was investigated for the removal of Cd (II), Cr (III) and Pb (II) from aqueous solutions. The kinetics of biosorption are studied, analyzing the effect of the initial concentration of metal and temperature. Pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models have been used to represent the kinetics of the process and obtain the main kinetic parameters. The results show that the pseudo-second order model is the one that best describes the biosorption of the three metal ions for all the range of experimental conditions investigated. For the three metal ions, the maximum biosoption capacity and the initial biosorption rate increase when the initial metal concentration rises. However, the kinetic constant decreases when the initial metal concentration increases. The temperature effect on biosorption capacity for Cd (II) and Cr (III) is less significant; however, for Pb (II) the effect of temperature is more important, especially when temperature rises from 25 to 40ºC. The biosorption capacity at mmol/g of olive stone changes in the following order: Cr>Cd>Pb. Thus, for an initial concentration of 220 mg/ℓ, a maximum sorption capacity of 0.079 mmol/g for Cr (III), 0.065 mmol/g for Cd (II) and 0.028 mmol/g for Pb (II) has been obtained.
Sponsorship: The authors are grateful to the Ministerio de Educación y Ciencia for the financial support received (Projet CTM2005-03957/TECNO) for the realization of this work.
Publisher: Associação Brasileira de Engenharia Química
Keywords: Heavy metals
Olive stone
URI: http://hdl.handle.net/10481/33000
ISSN: 0104-6632
Citation: Calero, M.; et al. Biosorption kinetics of Cd (II), Cr (III) and Pb (II) in aqueous solutions by olive stone. Brazilian Journal of Chemical Engineering, 26(2): 265-273 (2009). [http://hdl.handle.net/10481/33000]
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