title: Fluoride sorption by nano-hydroxyapatite/chitin composite.
abstract: In this study the fluoride adsorption potential of novel nano-hydroxyapatite/chitin (n-HApCh) composite was explored. The sorbent was characterized using FTIR studies. The effects of pH, interfering anions and contact time were studied. The sorption data obtained under optimized conditions were subjected to Langmuir and Freundlich isotherms. Kinetic studies indicate that the rate of sorption of fluoride on n-HApCh composite follows pseudo-second-order and pore diffusion patterns. n-HApCh composite possesses higher defluoridation capacity (DC) of 2840 mg F(-)kg(-1) than nano-hydroxyapatite (n-HAp) which showed a DC of 1296 mg F(-) kg(-1). Field trials were conducted with the sample collected from a nearby fluoride endemic area.
authors: Department of Science and Humanities, Karaikal Polytechnic College, Karaikal 609609, Puducherry, India. sairam adithya@yahoo.com
authors: C
authors: C
authors: Sairam Sundaram
authors: Natrayasamy
authors: N
authors: Viswanathan
authors: S
authors: S
authors: Meenakshi
mesh_terms: D000327:Adsorption; D000838:Anions; D002686:Chitin / Q000737:chemistry*; D004058:Diffusion; D017886:Durapatite / Q000737:chemistry; D005459:Fluorides / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D006882:Hydroxyapatites / Q000737:chemistry*; D007700:Kinetics; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D013816:Thermodynamics; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D000838:Anions; D006882:Hydroxyapatites; D014874:Water Pollutants, Chemical; D002686:Chitin; D017886:Durapatite; D005459:Fluorides