T he Ca-Al-Zn layered double hydroxide (LDh) which synthesized by the co-precipitation method and its calcined product was used in the removal of Cu(II) from aqueous solutions. At optimum conditions, the calcined Ca-Al-Zn LDh product has a higher potential application in the cupreous ion's adsorption field (45.2mg/g) than the uncalcined LDH (38.8mg/g). Langmuir and Freundlich models were used to optimizing the adsorption process and pseudo-first and pseudo-second-order models were used to evaluating the adsorption kinetics of Cu(II) onto Ca-Al-Zn LDH and its calcined product. Langmuir model fitted the experimental data better than Freundlich model and the pseudo-first-order model is more sufficient to depict the adsorption kinetics. From thermodynamic studies; Gibbs free energy (∆G°), Enthalpy change (∆H°), and Entropy change (∆S°) revealed that the adsorption processes are spontaneous, endothermic, and randomness processes at the solid-solution interface during adsorption.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.