The capacity of banana peels (Musa paradisiaca L.) immobilized into calcium alginate beads to remove chromium (VI) ions from aqueous solution was studied. Immobilization enhances sorption of chromium (VI) and repetitive use of sorbent could be achieved. The immobilized banana peels in to calcium alginate beads was characterized by FTIR, SEM and XRD. The influence of several operating experimental parameters such as solution pH, biosorbent dose concentration, initial chromium (VI) ions concentration, contact time, temperature and agitation rate determine the efficiency of metal uptake by biosorbent. Desorption efficiency of banana peels immobilized in to calcium alginate beads was highest for sulphuric acid followed by hydrochloric acid and nitric acid. The equilibrium isotherm data were comparing by using the Langmuir, Freundlich, DKR and Temkin adsorption isotherm models in which Langmuir isotherm was found to be fitted best. The Kinetics of sorption of chromium (VI) were described by a pseudo-First-order kinetic, pseudo-second-order kinetic, Elovich and Weber and Morris intra-particle diffusion model in which pseudo second order model was found to be fitted best. Thermodynamic studies were also carried out. The results showed that immobilized banana peels (Musa paradisiaca L.) in to calcium alginate beads was a low-cost promising sorbent for sequester of chromium (VI) from wastewater.
biosorption, desorption, chromium (VI), banana peels (Musa paradisiaca L.), Immobilization, calcium alginate beads, adsorption isotherm, adsorption kinetics, thermodynamic study
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