Abstract
The paper presents a novel method to produce sorbents from fly ash (FAI) based on modification by chitosan for zinc(II) removal from aqueous solutions. It also describes a study of the effectiveness of Zn(II) sorption onto the sorbents prepared from FA by thermal activation (from FAI-373 to FAI-1173) as well as by thermal activation and chemical modification using chitosan (from FAICS-373 to FAICS-1173). Serial batch kinetics and static tests were conducted in order to investigate the effects of some important parameters such as the initial concentration, the phase contact time, the pH value of the solution, the obtained sorbent amount, as well as the temperature. The kinetic process was described using the pseudo first order (PFO), pseudo second order (PSO), and intraparticle diffusion (IPD) models. The experimental data were analyzed using the Langmuir, Freundlich, and Temkin isotherm models in order to study adsorption mechanisms. The correlation coefficient values show that for the FAICS the sorption ...
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