Biosorption study of Ni2+ and Cr3+ by Sargassum filipendula: kinetics and equilibrium

Brazilian Journal of Chemical Engineering

A. A. Seolatto²  T. D. Martins¹  R. Bergamasco¹  C. R. G. Tavares¹  E. S. Cossich¹  E. A. Da Silva¹ 

[1] ,Federal University of Goiás - UFG School of Chemistry Goiânia GO ,Brazil

关键词: Algal biomass;    Mathematical modeling;    Neural networks;    Single solution;    Binary solution;   

DOI  :  10.1590/S0104-66322014000100020

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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