Abstract
The biosorption of chromium (VI) ions to Ulva.lactuca studied in a batch system with respect to the concentration, initial pH and initial metal ion concentration. The algal biomass exhibited the highest chromium (VI) adsorption capacity at 20°C, at the initial pH value of 3.0. Biosorption capacity increased from 0.70 to 1.08 mg g -1 with an increase in initial chromium (VI) concentration from 29.14; 38.28; 58.47 mgL -1 . Freundlich and Langmuir isotherm models were tried to represent the equilibrium data of chromium (VI) biosorption depending on concentration. Equilibrium data fitted very well to the Langmuir model in the studied concentration range of chromium (VI) ions at all the concentrations studied. The pseudo second-order kinetic model was also applied to experimental data assuming that the external mass transfer limitations in the system can be neglected and biosorption is sorption controlled.
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