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- Title
THE EQUILIBRIUM, KINETIC, AND THERMODYNAMIC PARAMETERS OF THE ADSORPTION OF THE FLUORIDE ION ON TO SYNTHETIC NANO SODALITE ZEOLITE.
- Authors
Balarak, Davoud; Mostafapour, Ferdos Kord; Bazrafshan, Edris; Mahvi, Amir Hossein
- 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 (∆G), enthalpy (∆H), and entropy (∆S) were also calculated. These parameters indicated that the adsorption of F on to SNSZ was feasible, spontaneous, and endothermic in nature.
- Subjects
ZEOLITES; THERMODYNAMICS; SCANNING electron microscopy
- Publication
Fluoride, 2017, Vol 50, Issue 2, p223
- ISSN
0015-4725
- Publication type
Article