Performance of cross-linked chitosan based hybrid ternary blend for separation of cadmium

Treatment A series of Chitosan(CS)/Poly(vinyl alcohol)(PVA)/ Methylcellulose(MC) hybrid ternary blend with crosslinked of glutaraldehyde (G) was fabricated by a solution casting method, in order to be used as a potential sorbent material for toxic soft metal of cadmium (Cd). The fabricated crosslinked CS/ PVA / MC hybrid ternary blend film were characterized by FT-IR, X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Effect of time, pH, adsorbent dose and adsorbate concentration on the adsorption of Cd (II) was investigated in batch process and pseudo-first and pseudo-second-order kinetic models was also evaluated. The data was analyzed on the basis of Lagergren pseudo first order, and pseudo-second order. Regardless of the metal ion species, the adsorption capacity rapidly reached and adsorption followed second order kinetic equation. The equilibrium adsorption obeyed Langmuir and Freundlich isotherms were calculated. The maximum monolayer adsorption capacity of CS/PVA/MC-G blend film as obtained from Langmuir adsorption isotherm was found to be 100.15 mg g-1 for Cd (II) ions. The experimental results demonstrated that CS/PVA/MC-G blend film could be used for the removal of Cd (II) ions from aqueous medium through adsorption. The regeneration study indicates that CS/PVA/MC-G blend film could be used repeatedly without significantly changing their adsorption capacities and desorption percentage.