Equilibrium, kinetic and thermodynamic studies of Reactive Red 120 dye adsorption by chitosan beads from aqueous solution

摘要: Chitosan beads (CHB) were prepared and studied in a batch mode operation for the adsorption of Reactive Red 120 dye from aqueous solution. Characterization on surface CHB was achieved by using point zero charge (pHpzc) method, Fourier transform infrared spectroscopy, scanning electron microscopy. Adsorbent dosage (0.02–1.5 g), initial pH solution (4–12), concentrations (30–400 mg/L), contact time (2–500 min) used as function to optimize equilibrium experiments that carried out during course this study. The data show process obeys Langmuir model with maximum capacities 114.9, 123.5 129.9 mg/g 303, 313 323 K, respectively. kinetics RR well-fitted pseudo-second-order kinetics. Thermodynamic parameters such standard Gibbs free energy (∆G°), enthalpy (∆H°) entropy (∆S°) determined. positive value indicates uptake onto is endothermic nature. results obtained supported use an effective well favorable adsorbent treating dye.