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Adsorption of Fluoride From Aqueous Solutions by a Chitosan/Zeolite Composite



Mahvi AH1, 2 ; Mostafapour FK3 ; Balarak D3 ; Khatibi AD1, 3
Authors
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Authors Affiliations
  1. 1. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran

Source: Fluoride Published:2019

Abstract

This study examined the feasibility of removing the fluoride ion (F-) from aqueous solutions using a chitosan/zeolite composite. The effects of F- concentration, chitosan/zeolite composite dosage, and contact time on the adsorption of F- by chitosan/zeolite composite at a constant temperature (30ºC) and pH (pH = 7) were also evaluated. Pseudo-first and second-order, intraparticle diffusion, and Bangham models were adopted to evaluate the experimental data and thereby elucidate the kinetic adsorption process. The adsorption percentage of F- increased as the chitosan/zeolite composite dosage and the contact time increased. Conversely, the adsorption percentage decreased as the F- concentration increased. The pseudo-second-order model best represented the adsorption kinetics. Based on the regressions of the intraparticle diffusion and Bangham models, the experimental data suggest that the adsorption of F- on to the chitosan/zeolite composite involved intraparticle diffusion, but that was not the only rate-controlling step. © 2019, ISFR.
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