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Study on the fluoride adsorption of various apatite materials in aqueous solution


Gao, S and Cui, J and Wei, Z, Study on the fluoride adsorption of various apatite materials in aqueous solution, Journal of Fluorine Chemistry, 130, (11) pp. 1035-1041. ISSN 0022-1139 (2009) [Refereed Article]

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Copyright 2009 Elsevier B.V.

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DOI: doi:10.1016/j.jfluchem.2009.09.004


The aim of this study was to evaluate the defluoridation efficiencies of various sorbents in aqueous solution. These sorbents include synthetic nano-hydroxyapatite (n-HAp), biogenic apatite (bone meal), treated biogenic apatite (bone meal prepared by H2O2 oxidation) and geogenic apatite (rock phosphate), which were characterized by XRD, FTIR, TEM and SEM. It has been observed that the defluoridation capacities follow the order: n-HAp > BH2O2 > B > rock phosphate. The controlling factors, sorbent dose, initial fluoride concentration, pH, contact time and temperature were investigated. The defluoridation capacities increased with the increase in the initial fluoride concentration and contact time, decreased with the increase in the sorbent dose. The optimum pH range for removal of fluoride on various apatite sorbents was considered to be 5.06.0. The fluoride adsorption can be explained by Langmuir, Freundlich isotherms, and the adsorption kinetic data follow the pseudo-second-order model. Thermodynamic parameters such as ΔH0, ΔS0 and ΔG0 indicated that the adsorption on various apatite sorbents was spontaneous and endothermic. These results showed that bone meal is a promising material for fluoride adsorption.

Item Details

Item Type:Refereed Article
Keywords:adsorption, apatite, n-HAp, bone meal, defluoridation capacity
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Wei, Z (Professor Zhenggui Wei)
ID Code:91142
Year Published:2009
Web of Science® Times Cited:100
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2014-05-09
Last Modified:2014-06-12

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