Synthesis and applications of eco-magnetic nano-hydroxyapatite chitosan composite for enhanced fluoride sorption. (10th December 2015)

• Record Type: Journal Article
• Authors: Pandi, Kalimuthu; Viswanathan, Natrayasamy
• Is Part Of: Carbohydrate polymers. Volume 134(2015)
• Page Start: 732
• Page End: 739
• Publication Date: 2015-12-10
• Subjects: Chitosan -- Nano-hydroxyapatite -- Eco-magnetic -- Composite -- Fluoride -- Sorption; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2015.08.003
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Defluoridation study was carried out using eco-magnetic Fe3 O4 @n-HApCS composite. Fe3 O4 @n-HApCS composite possesses higher defluoridation capacity (DC) than individual components. In field studies, the composite reduce fluoride concentration below the tolerance limit. Fe3 O4 @n-HApCS composite can easily recover and separate by external magnetic field. Abstract: Adsorption is a significant reaction occurs between adsorbent/water interface for controlling the pollutants in the aqueous environment. In this regard, an eco-magnetic biosorbent was prepared by uniform deposition of magnetic Fe3 O4 particles on the surface of nano-hydroxyapatite (n-HAp)/chitosan (CS) nanocomposite namely Fe3 O4 @n-HApCS composite as versatile sorbent for fluoride sorption. The resulting Fe3 O4 @n-HApCS nanocomposite was characterized by FTIR and SEM with EDAX techniques. The defluoridation capacity (DC) was found to depend on the contact time, pH, co-existing anions, initial fluoride concentration and temperature. The sorption isotherm was investigated by Freundlich, Langmuir and Temkin isotherm models using the batch method. The thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of fluoride sorption. The results of this research work designated that Fe3 O4 @n-HApCS composite having the excellent defluoridation capacity than the individual components and interesting to note that the easy magnetic separation of Fe3 O4 @n-HApCS composite from aqueous medium.