Removal of cadmium from aqueous solutions by adsorption onto persimmon tannins-immobilized on Chitosan

摘要

In this work, a novel adsorbent to adsorbed Cd(II) from aqueous solution was prepared by immobilized persimmon tannin (PT) on chitosan(CS). The maximum adsorption capacity reached 126 mg/g at 303 K and pH 6.0 when the initial concentration of Cd(II) was 100 mg/L. The Freundlich model and the pseudo-second-order model can well fit to explain its adsorption isothermal and kinetic data, respectively. All these results indicated that the PTCS biosorbent could be used as a low-cost alternative for the adsorption of Cd(II) in waste-water treatment.