Competitive biosorption of cadmium(II) and zinc(II) ions from binary systems by Sargassum filipendula
2010
Luna, Aderval S. | Costa, André L.H. | Costa, Antonio Carlos A. da | Henriques, Cristiane A.
The present work describes our study on the competitive biosorption of Cd(II) and Zn(II) ions onto Sargassum filipendula from single component and binary systems. Results showed that S. filipendula was an efficient biosorbent for the removal of Cd(II) and Zn(II) ions from an aqueous solution. The equilibrium experimental data for the single component system for the two metallic species fitted well to Langmuir and Langmuir-Freundlich isotherm models. Seven isotherm models were tested with the equilibrium data for modeling of the binary system. Based on the sum of squares error, the Langmuir-Freundlich isotherm model showed the best fit to the binary adsorption data. The influence of the additional cation on the behavior of the biosorption of Cd²⁺ and Zn²⁺ was analyzed comparing single component and binary isotherms. It was observed that Zn²⁺ had a relevant effect on the Cd²⁺ biosorption, but the interference of Cd²⁺ on the sorption of Zn²⁺ was considerably less intense.
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