Synthesis of EDTA-crosslinked Chitosancarboxymethyl Cellulose Film as Cu(II) Adsorbent

Abstract

EDTA-crosslinked chitosan-carboxymethyl cellulose (C-CMC) film as Cu(II) adsorbent was synthesized. The study aimed to investigate the optimum value of EDTA, Chitosan and CMC to form a polyelectrolyte complex and their effect to the adsorption properties. The film stability in acid and base medium, swelling behaviour, surface morphology by SEM and functional groups by FTIR was investigated. The FTIR spectra showed -NH2 from chitosan and –COO– from CMC and EDTA were present and found to act as the active sites in bond formation to form a crosslinked PEC structure and chelating sites for adsorption process. The formation of interpenetration network was observed by SEM. Swelling capacity was enhanced with CMC addition. EDTA addition decreased swelling capacity yet increased film stability in acidic medium. The optimum condition for Cu(II) adsorption was at pH 5 for 90 mins with initial metal concentration of 100 mg/L resulted in adsorption capacity of 73.95 mg/g. The adsorption process well-fitted to pseudo-second order and Freundlich model. The interaction of Cu(II) onto the active sites of the film was dominated by covalent coordination and exhibit the best desorption capacity with the aid of Na2EDTA