This study used batch adsorption techniques to evaluate the potential suitability of chitosan-coated bentonite (CCB) beads as an adsorbent for the removal of indium ions from aqueous solution. Percentage removal and adsorption capacity of indium (III) ions were examined as a function of solution pH, initial concentration, adsorbent dosage and temperature. The experimental data were fitted with several adsorption isotherm models to describe the adsorption process of indium (III) ions on CCB beads and the best interpretation for equilibrium data was given by Langmuir isotherm. The mean energy (E) value was found in the range of 1-8 kJ/mol, indicating that the type of sorption of indium ions onto CCB is essentially physical. Thermodynamic parameters, including Gibbs free energy, enthalpy, and entropy indicated that the indium (III) ions adsorption onto CCB was feasible, spontaneous and endothermic in the temperature range of 278-318K. The kinetics was evaluated utilizing the pseudo-first order and pseudo-second order model. The adsorption kinetics followed the mechanism of pseudo-second order with correlation coefficient greater than 0.99 evidencing chemical sorption as the rate-limiting step.

Adsorption of Indium (III) ions from aqueous solution using chitosan-coated bentonite beads

248th National Meeting (2014)

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