Kinetic Adsorption of Silver Ion by Chitosan Resin

Abstract

Chitosan resin as adsorbent for adsorption of silver ion solution was studied. Batch experiments were carried out the dosage of adsorbent, initial concentration and pH of silver ion. The experimental result showed that an increasing of initial concentration increased adsorption capacity. The adsorption capacity of chitosan resin amount 0.5 g, initial concentration 100 mg/L and pH 6.0 occurred 22.8 mg/g. The silver ion could be explained by Freundlich adsorption model. The pseudo-second order was fit for describing the kinetic of adsorption. The initial rate of adsorption and half-adsorption time was 8.6 mg/g-min and 2.7 min, respectively. The mechanism of the silver ion adsorption by chitosan resin occurred in 2 steps results from intraparticle diffusion and equilibrium of adsorption.