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



Balarak D1 ; Mostafapour FK1 ; Bazrafshan E1, 2 ; Mahvi AH2, 3
Authors
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Authors Affiliations
  1. 1. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  2. 2. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran

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.
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