Kinetics and Thermodynamics of Adsorption of Fluorides by ZeoSonNaFe
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.469
Kinetics and Thermodynamics of Adsorption of Fluorides by ZeoSonNaFe Jessica López-Castillo1, G. Macedo-Miranda1*, S. Martínez-Gallegos1*, E. Ordoñez2, J. Illescas1, P. Barragán-Peña3 and Guillermina Gómez-Beltrán4 1 Tecnológico Nacional de México/ Instituto Tecnológico de Toluca, Av. Tecnológico, s/n, col. Agrícola Bellavista, Metepec, México, C. P. 52140 2 Instituto Nacional de investigaciones nucleares, Carretera México-Toluca s/n, La Marquesa, Ocoyoacac México, C.P. 52750 3 Tecnológico Nacional de México/ Instituto Tecnológico de Nogales, Ave. Tecnológico 911 Col. Granja, C.P.84065 4 Universidad Tecnológica del Valle de Toluca, Carretera, Del Depto del Distrito Federal km 7.5, 52044 Santa María Atarasquillo, Méx
Abstract:
The present study investigated the adsorption of fluorides in natural zeolites clinoptilolitetype, sourced in Sonora, Mexico, and modified with Fe. Characterization of the material was carried out along with determination of kinetic parameters varying time and concentration of reagents to calculate maximum adsorption capacity. To determine thermodynamic parameters temperature was varied for accurate characterization of the adsorption process. It was found that the zeolite fixed Fe in its structure without model significant modification, likewise when put in contact with a fluoride solution (F-), it was capable of taking up these ions through adsorption due to the interaction between the sorbato and the pollutant. The kinetics best fit Pseudo-second-order model with Qmax=0.91 mgg-1, therefore it indicates that the process is reversible, spontaneous and endothermic what can favor the reuse of the material.
INTRODUCTION: Fluoride is considered an oligoelement, it is used to prevent cavities in teeth mainly, however, the extended use of this element in concentrations higher than 1.5 mgL[1]. can cause damage to human health, among others: Both conditions are irreversible; that is why it is vital to keep this pollutant within limit permitted by World Health Organization (WHO) [2]. Fluorides can be found in underground or superficial water because of demineralization of fluorite rock and in wastewater from aluminum 1
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industry, steel, metal, glass, and semiconductors. Some of the methods used to remove fluoride in aqueous systems membranes or coagulation-flocculation are common, however, these methods are usually very expensive, on the other side adsorption has the advantage of versatility and, depending on the sorbent, of low cost. The need to improve efficiency in fluoride removal makes necessary the development and test of new materials that lead to achieve this goal [3,4]. The aim of this research is to evaluate the removal process of fluoride ions from aqueous solutions with a
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