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Adsorption of Fluoride on Chitosan in Aqueous Solutions: Determination of Adsorption Kinetics



Akbari H1 ; Jorfi S2 ; Mahvi AH3 ; Yousefi M4 ; Balarake D5
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health, Health Promotion Research Center and School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran
  2. 2. Ahvaz Jundishapur University of Medical Sciences, Environmental Technologies Research Center, Department of Environmental Health Engineering, School of Health, Ahvaz, Iran
  3. 3. Department of Environmental Health Engineering, School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Environmental Health, Mamasani Education Complex for Health, Shiraz University of Medical Science, Shiraz, Iran
  5. 5. Health Promotion Research Centre and Zahedan University of Medical Sciences, School of Public Health, Department of Environmental Health Engineering, Zahedan, Iran

Source: Fluoride Published:2018

Abstract

The fluoride ion (F) is widely used in different industries, including the semi-conductor, power plant, and glass product industries, and is released into the environment through effluents. Accordingly, the effectiveness of chitosan in the adsorption of F from water was evaluated in this study. At different concentrations of F, the significance of contact duration, pH, and adsorbent dose was examined in laboratory conditions. To understand the mode of adsorption and its kinetics, the Langmuir, Freundlich, and Temkin isotherms and the pseudo-first-order, the pseudosecond order, and the intraparticle diffusion model equations for the equilibrium adsorption data were analyzed. The results for the adsorption of F onto chitosan were best described by the Langmuir isotherm and the pseudo-second order models with the correlation values for both being 0.997. A contact time of 180 min, an adsorbent dosage of 5 g/L, and a pH of 7 were considered to be the optimal operational conditions and gave a fluoride removal efficiency of 87%. We conclude that, fluoride adsorption by chitosan can effectively remove fluoride from water. © 2018, ISFR.
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