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Isothermic and Kinetic Modeling of Fluoride Removal From Water by Means of the Natural Biosorbents Sorghum and Canola



Zazouli MA1 ; Mahvi AH2 ; Mahdavi Y1 ; Balarak D3
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, Health Sciences Research Center, Mazandaran University of Medical Sciences, Sari, Iran
  2. 2. Department of Environmental Health Engineering, Health Sciences Research Center, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Environmental Health, Health Promotion Research Center, School of Public Health, Zahedan University of Medical Sciences, Zahedan, Iran

Source: Fluoride Published:2015

Abstract

This study investigated the performance of sorghum and canola as cheap natural adsorbents in fluoride (F) removal from water. The natural materials were dried, crushed, screened, and bicarbonate-treated. The effect on adsorbent performance of various parameters, such as pH, adsorbent dose, contact time, and F concentration, were investigated. The F concentration was measured by spectrophotometer at λmax=570 nm. The isotherms and kinetics of adsorption were determined. The results indicated that F removal by both adsorbents increased with increasing contact time and adsorbent dose. However, the removal rate reached a constant amount with an 10 g/L dose of canola and sorghum after 90 and 60 min respectively. For an initial F concentration of 10 mg F/L, the F removal efficiency by the activated stalks of sorghum and canola was 94% and 79%, respectively. Maximum F removal was obtained at pH=5. The adsorption data followed the type 2 Langmuir isotherm and the pseudo-second-order kinetic. The studied adsorbents can potentially be used as low-cost media for removal of F from, for example, industrial effluents. © 2015 The International Society for Fluoride Research Inc.
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