Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/15147
Tipo do documento: Artigo
Título: Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium
Autor: Seolatto, Araceli Aparecida
Martins, Tatiana Duque
Bergamasco, Rosangela
Tavares, Celia Regina Granhen
Cossich, Eneida Sala
Silva, E. A. da
Abstract: 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.
Palavras-chave: Algal biomass
Mathematical modeling
Neural networks
Single solution
Binary solution
País: Brasil
Unidade acadêmica: Instituto de Química - IQ (RG)
Citação: SEOLATTO, A. A. et al. Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium. Brazilian Journal of Chemical Engineering, São Paulo, v. 31, n. 1, p. 211-227, Jan./Mar. 2014.
Tipo de acesso: Acesso Aberto
URI: http://repositorio.bc.ufg.br/handle/ri/15147
Data de publicação: Mar-2014
Aparece nas coleções:IQ - Artigos publicados em periódicos

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