Thermodynamics, Kinetics and Desorption Studies of Heavy Metal Ions by Grafted Cross-Linked Chitosan Beads Composites

Functionalized grafted cross-linked chitosan bead (G/CR-CS), prepared from pure chitosan for the removal of scavenging metal ions from aqueous solutions, has been studied. The modified material was then characterized using FTIR, SEM, TGA, BET and XRD to assert successful modification. Parameters such as effect of contact time, pH and temperature were investigated to determine their physicochemical properties for the maximum removal of metal ions using batch applications. The results indicated that adsorption performance of the modified chitosan beads can be modelled efficiently using Langmuir isotherm and pseudo-second-order kinetic. Also, calculated thermodynamic parameters (ΔG0, ΔH0 and ΔS0) indicated that the adsorption of metal ions onto the grafted cross-linked chitosan is spontaneous and endothermic in nature.