Abstract
Preparation and evaluation of chitosan-coated eggshell (CTS-ES) particles as a biosorbent for removal of Cu(II) ions from aqueous media was considered in this research. For this purpose, chitosan was coated on eggshell (ES) particles through precipitation procedure. The coated particles were characterized by Fourier transform infrared, thermogravimetric analysis, and field emission scanning electron microscopy analysis. Kinetic studies showed that coating of chitosan on ES particles improved their Cu(II) adsorption capacity. The removal of Cu(II) ions by either ES or CTS-ES particles followed the pseudo-second-order kinetics, indicating that chemical sorption is the rate-limiting step for both of them. Langmuir and Freundlich models were used to describe the mechanism of the Cu(II) adsorption. The data fitted well with the Langmuir model, showing both ES and CTS-ES particles are homogenous adsorbents. The coated particles had maximum Cu(II) adsorption capacity of 95.2 mg/g, which was higher than that of ES particles (73.5 mg/g). The adsorption capacities of the either ES or CTS-ES particles were reduced with decreasing the pH and ionic strength of media. Therefore, the prepared CTS-ES particles can be used as a potential renewable resource-based and cost-effective biosorbent for removal of Cu(II) ions from aqueous media.
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