Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 155, Issue 1-2, Pages 206-215Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2007.11.048
Keywords
defluoridation; n-HAp; Langmuir; Freundlich; Redlich-Peterson; pseudo-first-order; pseudo-second-order; particle and pore diffusion; adsorption; ion-exchange
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This study describes the advantages of nano-hydroxyapatite (n-HAp), a cost effective sorbent for fluoride removal. n-HAp possesses a maximum defluoridation capacity [DC] of 1845 mg F-/kg which is comparable with that of activated alumina, a defluoridation agent commonly used in the indigenous defluoridation technology. A new mechanism of fluoride removal by n-HAp was proposed in which it is established that this material removes fluoride by both ion-exchange and adsorption process. The n-HAp and fluoride-sorbed n-HAp were characterized using XRD, FTIR and TEM studies. The fluoride sorption was reasonably explained with Langmuir, Freundlich and Redlich-Peterson isotherms. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees and E-a were calculated in order to understand the nature of sorption process. The sorption process was found to be controlled by pseudo-second-order and pore diffusion models. Field studies were carried out with the fluoride containing water sample collected from a nearby fluoride endemic area in order to test the suitability of n-HAp material as a defluoridating agent at field condition. (C) 2007 Elsevier B.V. All rights reserved.
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