title: Synthesis and applications of eco-magnetic nano-hydroxyapatite chitosan composite for enhanced fluoride sorption.
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 Fe3O4 particles on the surface of nano-hydroxyapatite (n-HAp)/chitosan (CS) nanocomposite namely Fe3O4@n-HApCS composite as versatile sorbent for fluoride sorption. The resulting Fe3O4@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 Fe3O4@n-HApCS composite having the excellent defluoridation capacity than the individual components and interesting to note that the easy magnetic separation of Fe3O4@n-HApCS composite from aqueous medium.
authors.affiliation: Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India.
authors.forename: Kalimuthu
authors.initials: K
authors.lastname: Pandi
authors.affiliation: Department of Chemistry, Anna University, University College of Engineering - Dindigul, Reddiyarchatram, Dindigul - 624 622, Tamilnadu, India. Electronic address: natrayasamy_viswanathan@rediffmail.com.
authors.forename: Natrayasamy
authors.initials: N
authors.lastname: Viswanathan
mesh_terms: D000327:Adsorption; D060326:Chemistry Techniques, Synthetic; D048271:Chitosan / Q000737:chemistry*; D017886:Durapatite / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry* / Q000302:isolation & purification*; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D058185:Magnetite Nanoparticles; D014874:Water Pollutants, Chemical; D014867:Water; D048271:Chitosan; D017886:Durapatite; D005459:Fluorides
keywords: Chitosan; Composite; Eco-magnetic; Fluoride; Nano-hydroxyapatite; Sorption