An Al2O3-supported iron oxide was developed for the removal of Pb2+ from aqueous solutions in this study. The surface of the FeAA adsorbent was characterized by XRD and FTIR and was identified as -FeOOH. Furthermore, the ability of FeAA to bind Pb2+ was tested using equilibrium, kinetic and thermodynamic aspects.
The Langmuir and Freundlich adsorption models were used to express the sorption phenomenon of the sorbate. The equilibrium data were well described by the Langmuir model. In addition, the negative Gibbs standard free energy changes confirmed the spontaneous nature adsorption process. The positive standardenthalpyandtheentropychangesshowedtheendothermic nature and irreversibility of Pb2+ adsorption, respectively. The pseudo-second-order rate model accurately describes the kinetics of adsorption.