Abstract
Lessonia nigrescens and Lessonia trabeculata kelps have been tested for the sorption of mercury from aqueous solutions. A pretreatment (using CaCl2) allowed stabilizing the biomass that was very efficient for removing Hg(II) at pH 6–7. Sorption isotherms were described by the Langmuir equation with sorption capacities close to 240–270 mg Hg g−1 at pH 6. The temperature had a negligible effect on the distribution of the metal at equilibrium. The presence of chloride anions had a more marked limiting impact than sulfate and nitrate anions. The uptake kinetics were modeled using the pseudo-second-order equation that fitted better experimental data than the pseudo-first-order equation. The particle size hardly influenced sorption isotherms and uptake kinetics, indicating that sorption occurs in the whole mass of the biosorbent and that intraparticle mass transfer resistance was not the limiting rate. Varying the sorbent dosage and the initial metal concentration influenced the equilibrium, but the kinetic parameters were not drastically modified. Metal can be eluted with hydrochloric acid, citric acid, or acidic KI solutions.
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Acknowledgements
Authors thank the European Commission for the funding of the project BIOPROAM (Contract no. AML/190901/06/18414/II-0548-FC-FA, in the framework of ALFA program). Authors acknowledge Jean-Marie Taulemesse (Centre des Matériaux de Grande Diffusion at Ecole des Mines d’Alès) for his technical support for SEM-EDAX analysis.
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Reategui, M., Maldonado, H., Ly, M. et al. Mercury(II) Biosorption Using Lessonia sp. Kelp. Appl Biochem Biotechnol 162, 805–822 (2010). https://doi.org/10.1007/s12010-010-8912-5
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DOI: https://doi.org/10.1007/s12010-010-8912-5