Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula : kinetics and equilibrium
A. A. Seolatto, E. A. da Silva, E. S. Cossich, C. R. G. Tavares, R. Bergamasco, T. D. Martins
ARTIGO
Inglês
In this work, the biosorption of Cr3+ and Ni2+ by Sargassum filipendula pre-treated with CaCl2 was studied. Kinetic and equilibrium experiments were carried out for mono- and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr3+...
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In this work, the biosorption of Cr3+ and Ni2+ by Sargassum filipendula pre-treated with CaCl2 was studied. Kinetic and equilibrium experiments were carried out for mono- and multi-component solutions in a batch reactor at pH 3.0 and 30 ºC. The results from the kinetic experiments showed that Cr3+ adsorbs slower than Ni2+. This behavior was explained by means of a mechanistic analysis, which showed that Cr3+ uptake presented three adsorption stages, whereas Ni2+ adsorption presents only two. The mono-component equilibrium data, along with binary kinetic data obtained from mono-component experiments, showed that, although the kinetics for Cr3+ removal are slower, the biomass had a stronger affinity for this ion. Almost all Ni2+ is desorbed from the biomass as Cr3+ adsorbs. The binary equilibrium data also presented this behavior. The binary data was also modeled by using modified forms of the Langmuir, Jain and Snoeyink, and Langmuir-Freundlich isotherms. However, the prediction obtained presented low accuracy. An alternative modeling with artificial neural networks was presented and the results showed that this technique could be a promising tool to represent binary equilibrium data. The main contribution of this work was to obtain experimental data for Cr3+/Ni2+ adsorption, which is a system rarely found in the literature and that provides information that could be used in process modeling and simulation
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Aberto
Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula : kinetics and equilibrium
A. A. Seolatto, E. A. da Silva, E. S. Cossich, C. R. G. Tavares, R. Bergamasco, T. D. Martins
Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula : kinetics and equilibrium
A. A. Seolatto, E. A. da Silva, E. S. Cossich, C. R. G. Tavares, R. Bergamasco, T. D. Martins
Fontes
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Brazilian journal of chemical engineering Vol. 31, no. 1 (Jan., 2014), p. 211-227 |