Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium
Carregando...
Data
2014-03
TĂtulo da Revista
ISSN da Revista
TĂtulo de Volume
Editor
Resumo
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 ÂșC. 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.
Descrição
Palavras-chave
Algal biomass, Mathematical modeling, Neural networks, Single solution, Binary solution
Citação
SEOLATTO, A. A. et al. Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium. Brazilian Journal of Chemical Engineering, SĂŁo Paulo, v. 31, n. 1, p. 211-227, Jan./Mar. 2014.