Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 17, Pages 8226-8230Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.03.012
Keywords
nano-hydroxyapatite; chitosan; n-HApC composite; defluoridation; sorption
Funding
- University Grants Commission, New Delhi, India [F.30-56/2004(SR)]
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A bioinorganic composite namely nano-hydroxyapatite/chitosan (n-HApC) composite which could be employed for technology development was prepared and studied for its defluoridation efficiency. It has been observed that there was a slight enhancement in the defluoridation capacity (DC) of n-HApC composite (1560 mg F-/kg) than nano-hydroxyapatite (n-HAp) which has a DC of 1296 mg F-/kg. The sorbents were characterized with XRD and TEM studies. The fluoride sorption was explained with Freundlich and Langmuir 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. 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 fluoride-endemic area in order to test the suitability of the sorbents at field conditions. (C) 2008 Elsevier Ltd. All rights reserved.
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