A Study of Removal of Lead (II) Ions from Aqueous Solution on Chitosan-g-poly (acrylic acid-co-crotonic acid) Hydrogel

Abstract

This study used chitosan-g-poly (acrylic acid-co-crotonic acid) hydrogel (Ch-g-P(AA-CA)) as an adsorbent to remove aqueous solutions of lead ion (Pb (II)). A flame atomic absorption spectrophotometer was used to estimate the ion’s adsorption amounts. Metal ion concentration, pH, existing salt, and temperature were all studied. A gile’s classification indicates that these isotherms are of the L-curve type, and the experimental data were best fit by Langmuir and Freundlich isotherm models. At various temperatures (15, 20, 25, and 30°C), adsorption and various thermodynamic parameters (ΔH, ΔS, and ΔG) were studied. It was found that the adsorption process was not spontaneous, based on the thermodynamic parameters of the metal ion-ch-g-P(AA-CA) hydrogel systems. Ch-g-P(AA-CA) hydrogel adsorption increased as the pH of the solution rose and decreased as the ionic strength rose, according to the study’s findings.