title: Novel one-pot synthesis of dicarboxylic acids mediated alginate-zirconium biopolymeric complex for defluoridation of water.
abstract: The present investigation explains the fluoride removal from aqueous solution using alginate-zirconium complex prepared with respective dicarboxylic acids like oxalic acid (Ox), malonic acid (MA) and succinic acid (SA) as a medium. The complexes viz., alginate-oxalic acid-zirconium (Alg-Ox-Zr), alginate-malonic acid-zirconium (Alg-MA-Zr) and alginate-succinic acid-zirconium (Alg-SA-Zr) were synthesized and studied for fluoride removal. The synthesized complexes were characterized by FTIR, XRD, SEM with EDAX and mapping images. The effects of various operating parameters were optimized. The result showed that the maximum removal of fluoride 9653mgF(-)/kg was achieved by Alg-Ox-Zr complex at acidic pH in an ambient atmospheric condition. Equilibrium data of Alg-Ox-Zr complex was fitted well with Freundlich isotherm. The calculated values of thermodynamic parameters indicated that the fluoride adsorption is spontaneous and endothermic in nature. The mechanism of fluoride removal behind Alg-Ox-Zr complex has been proposed in detail. The suitability of the Alg-Ox-Zr complex has been tested with the field sample collected in a nearby fluoride endemic area.
authors: Department of Chemistry, The Gandhigram Rural Institute, Deemed University Gandhigram, 624302, Dindigul, Tamil Nadu, India.
authors: Subbaiah Muthu
authors: SM
authors: Prabhu
authors: Department of Chemistry, The Gandhigram Rural Institute, Deemed University Gandhigram, 624302, Dindigul, Tamil Nadu, India. Electronic address: drs_meena@yahoo.co.in.
authors: Sankaran
authors: S
authors: Meenakshi
mesh_terms: D000464:Alginates / Q000737:chemistry*; D001704:Biopolymers / Q000737:chemistry*; D003998:Dicarboxylic Acids / Q000737:chemistry; D005459:Fluorides / Q000302:isolation & purification*; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D014867:Water / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D000464:Alginates; D001704:Biopolymers; D003998:Dicarboxylic Acids; D006603:Hexuronic Acids; D014867:Water; D020723:Glucuronic Acid; D015040:Zirconium; D005459:Fluorides
keywords: Adsorption; Dicarboxylic acid; Fluoride; Sodium alginate; Zirconium