S. Wierzba, S. Golasz
University of Opole, Independent Department of Biotechnology and Molecular Biology, Opole, PL

BIOSORPTION OF CR (III) FROM AQUEOUS SOLUTIONS USING ALGAE SPIRULINA MAXIMA BIOMASS


This study examined the biosorption process of Cr (III) from an aqueous solution by dead biomass of the algae Spirulina maxima . Optimum biosorption conditions were determined as a function of pH, biomass dosage, contact time, and temperature. The experimental data were analyzed in terms of pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The results showed that the Cr (III) biosorption processes was consistent with the pseudo-second-order kinetics model. The equilibrium data of Cr (III) ions at 20, 30 and 40 oC fitted the Langmuir and Freundlich isotherm models. Langmuir isotherm provided a better fit to the equilibrium data, with a maximum monolayer biosorption capacity of the Spirulina maxima biomass for Cr (III) of 35.95 mg·g-1. The calculated thermodynamic parameters demonstrated that the biosorption of Cr (III) ions onto the Spirulina maxima biomass was feasible, spontaneous and endothermic

Keywords: biosorption, Spirulina maxima , Cr (III), isotherm models, kinetic