Adsorption behavior of heavy metal ions from aqueous solution onto composite dextran-chitosan macromolecule resin adsorbent

Dextran-chitosan (DC) macromolecule resin was synthesized by ultrasonic heating and applied to adsorb various heavy metal ions (Cu 2+ , Co 2+ , Ni 2+ , Pb 2+ , Cd 2+ ). The morphology and structure of the samples were characterized by various testing methods. The effects of five factors on the adsorption properties were studied. The adsorption kinetics , thermodynamics and isotherm models were discussed theoretically. The results show that the adsorption of heavy metal ions by DC resin is a spontaneous single molecule chemical adsorption, and the adsorption capacities of DC resin for Cu 2+ , Co 2+ , Ni 2+ , Pb 2+ and Cd 2+ were 342 mg g −1 , 232 mg g −1 , 184 mg g −1 , 395 mg g −1 , and 269 mg g −1 , respectively at 20 °C, pH = 7 and adsorbent dose is 0.01 g. In addition, DC resin adsorbent has good reusability.