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Lead(II) and cadmium(II) biosorption from aqueous solutions by the Sargassum sp. biomass

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Author(s): Saeedi R. | Naddafi K. | Nabizadeh R.

Journal: Journal of School of Public Health and Institute of Public Health Research
ISSN 1735-7586

Volume: 5;
Issue: 2;
Start page: 13;
Date: 2007;
Original page

Keywords: Lead(II) | Cadmium(II)

ABSTRACT
Background and Aim:We studied the biosorption of lead(II) and cadmium(II) from aqueous solutions by the brown algae Sargassum sp. biomass in a batch system. The heavy metal uptake was quite rapid, reaching 88-96% of the equilibrium capacity of biosorption in 15 minutes. Material and Methods: Kinetic data were analyzed using the pseudo first-order, pseudo second-order, and saturation and second-order rate equations.Results: The pseudo second-order and saturation rate equations gave the best fit with the experimental data(R2 > 0.99). The data obtained from experiments of single-component biosorption isotherm were analyzed using the Freundlich, Langmuir, Freundlich-Langmuir and Redlich-Peterson isotherm models. The Redlich-Peterson equation was found to provide the best fit with the experimental data (R2 > 0.99). Also the other models described the isotherm of lead(II) and cadmium(II) biosorption with relatively high correlation coefficients (R2 > 0.93). Conclusion: Using the Langmuir model, the maximum uptake capacities (qm) of Sargassum sp. for Pb2+ and Cd2+ were 1.70 and 1.02mmolg-1, respectively.

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