The present work deals with, the potential of biosorption technique for
the removal of chromium from aqueous solutions using marine based material viz.Gracilaria
corticata powder. The experiments are carried out in a batch operation to
understand the equilibrium studies, kinetics and thermodynamics of the biosorption.
The maximum removal efficiency of 93.68% was obtained at a temperature of 323
K, pH 4, equilibrium time of 240 min and at an optimum biosorption dosage of 20 g/L of
44 μm particle size. The percentage biosorption increases with an increase in
initial concentration of chromium. The statistical analysis of biosorption
using Response Surface Methodology (RSM) was studied. The theoretical and
experimental values for % biosorption of chromium were observed as 85.39% and
85.49% respectively. It is evident that experimental values of % biosorption
are in close agreement with that values
predicted by Central Composite Design. The experimental data are well described
by Freundlich, Langmuir and Redlich isotherm models. The biosorption data
follows pseudo second order kinetics. Thermodynamic results showed that
biosorption is endothermic, irreversible and feasible.
Cite this paper
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