The Equilibrium, Kinetic, and Thermodynamic Parameters of the Adsorption of the Fluoride Ion on to Synthetic Nano Sodalite Zeolite



Balarak D¹ ; Mostafapour FK¹ ; Bazrafshan E^{1, 2} ; Mahvi AH^{2, 3}
Source: Fluoride Published:2017

Abstract

The equilibrium, kinetic, and thermodynamic parameters of the adsorption of the fluoride ion (F) on to synthetic nano sodalite zeolite (SNSZ) was studied in a batch system. The SNSZ was characterized by scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) techniques. The experimental data were analyzed by the Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, and Temkin isotherm models. The equilibrium data fitted well to the Langmuir model with a maximum adsorption capacity of 25.44 mg/g at 298 K. The pseudo-second-order kinetic model best described the adsorption process. The results proved that the SNSZ was an effective adsorbent for removal of F from aqueous solution. Thermodynamic parameters including the Gibbs free energy (ΔG), enthalpy (ΔH), and entropy (ΔS) were also calculated. These parameters indicated that the adsorption of F on to SNSZ was feasible, spontaneous, and endothermic in nature. © 2017, ISFR.