Biosorption kinetics of Cd (II), Cr (III) and Pb (II) in aqueous solutions by olive stone
AUTOR(ES)
Calero, M., Hernáinz, F., Blázquez, G., Martín-Lara, M. A., Tenorio, G.
FONTE
Brazilian Journal of Chemical Engineering
DATA DE PUBLICAÇÃO
2009-06
RESUMO
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.
Documentos Relacionados
- Adsorption isotherm studies of Cd (II), Pb (II) and Zn (II) ions bioremediation from aqueous solution using unmodified and EDTA-modified maize cob
- ADSORÇÃO DE Pb (II), Cd (II) E Cu (II) EM ARGILA CAULINÍTICA NATURAL E ARGILA NATURAL CONTENDO MONTMORILONITA.
- Estudo do potencial de biossorÃÃo dos Ãons Cd (II), Cu (II) e Zn (II) pela macrÃfita Eichhornia crassipes
- AvaliaÃÃo do potencial de biossorÃÃo dos Ãons Cd (II), Cu (II) e Zn (II) pela macrÃfita Egeria densa
- Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model