Defluoridation chemistry of synthetic hydroxyapatite at nano scale: equilibrium and kinetic studies
CS Sundaram, N Viswanathan, S Meenakshi - Journal of Hazardous …, 2008 - Elsevier
CS Sundaram, N Viswanathan, S Meenakshi
Journal of Hazardous Materials, 2008•ElsevierThis 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
1845mgF−/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 …
sorbent for fluoride removal. n-HAp possesses a maximum defluoridation capacity [DC] of
1845mgF−/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 …
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 1845mgF−/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 ΔG°, ΔH°, ΔS° and Ea 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.
Elsevier
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