African Journal of Environmental Science and Technology
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Article Number - 420E9D261955

Vol.11(1), pp. 1-10 , January 2017
ISSN: 1996-0786

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Full Length Research Paper

Biosorption of fluoride ion from water using the seeds of the cabbage tree (Moringa stenopetala)

Seid Tiku Mereta
  • Seid Tiku Mereta
  • Department of Environmental Health Sciences and Technology, Jimma University, P. O. Box 378, Jimma, Ethiopia.
  • Google Scholar

 Received: 04 September 2016  Accepted: 16 November 2016  Published: 31 January 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0

Conventional water treatment technologies for the removal of fluoride ion may not be feasible for developing countries due to their high investment and operational costs. The aim of this study was therefore, to investigate the fluoride biosorption potential of the seeds of the cabbage tree (Moringa stenopetala). The influence of Moringa dosage, pH, contact time, and initial concentration of fluoride ion was investigated. The maximum fluoride sorption capacity was found to be 1.32 mg.g-1 of dry weight of Moringa seeds at a biomass dosage of 2 g L-1, pH 7.00, initial fluoride ion concentration of 10 mg.L-1 and a contact time of 60 min. The fluoride level was reduced from 10 to 3.4 mg L-1. The adsorption of fluoride ion onto Moringa powder was best described by the pseudo-second-order kinetic model (R2 = 0.99). The adsorption equilibrium data have been fitted well to Langmuir as well as Freundlich adsorption models (R2≥0.97 for both models). The distribution constant (Kd) and maximum adsorption capacity (Bmax) were significantly influenced by the amount of Moringa and equilibrium fluoride ion concentration (p<0.05). The desorption tests indicated that only 20% of the initially bound fluoride ion was regenerated, while the remaining 80% were bounded with the Moringa powder. This suggests that chemisorption was the possible mechanism of fluoride removal.

Key words: Biosorption, chemisorption, desorption, fluoride, isotherm, Moringa stenopetala.

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APA Mereta, S. T. (2017). Biosorption of fluoride ion from water using the seeds of the cabbage tree (Moringa stenopetala). African Journal of Environmental Science and Technology , 11(1), 1-10.
Chicago Seid Tiku Mereta. "Biosorption of fluoride ion from water using the seeds of the cabbage tree (Moringa stenopetala)." African Journal of Environmental Science and Technology 11, no. 1 (2017): 1-10.
MLA Seid Tiku Mereta. "Biosorption of fluoride ion from water using the seeds of the cabbage tree (Moringa stenopetala)." African Journal of Environmental Science and Technology 11.1 (2017): 1-10.

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