Removal Of Pb2+ And Zn2+ From Aqueous Solution Using Eggshell Powder As Adsorbent: Kinetics And Equilibrium Studies

Abstract

The goal of this study is to use locally produced chicken eggshell powders to remove Pb²⁺ and Zn²⁺ from aqueous solutions using an adsorption approach. A local poultry farm provided the chicken eggshell powder used as an adsorbent. By testing their contact time effects in solution with Pb²⁺ and Zn²⁺, the adsorbent efficacy was compared to that of other similar biomasses. pH, contact time, beginning metal ion concentration, and sorbent dose all influence the sorption process, with pH 7.0 and a contact time of 60 minutes being the best. The adsorption kinetics were studied using pseudo-first order and pseudo-second order rate measurements. For the adsorption isotherm investigation, Langmuir and Freundlich models were used. With R2 of 0.834 and 0.993, the equilibrium adsorption data of Pb²⁺ and Zn²⁺ followed the Langmuir and Freundlich isotherms, respectively. The pseudo-second order rate model best represented the process, while the Freundlich isotherm model was the best fit for Pb²⁺ and Zn²⁺ adsorption onto eggshells as an adsorbent, according to the kinetics data. Finally, chicken eggshell powder can be used as a low-cost, effective local adsorbent for the removal of Pb²⁺ and Zn²⁺ from aqueous solutions.