title: Defluoridation of water using chitosan assisted ethylenediamine functionalized synthetic polymeric blends.
abstract: In this paper, a new kind of approach undertakes for the synthesis of novel chitosan (CS) blended with ethylenediamine (ED) functionalized synthetic polymers viz., acrylonitrile/divinylbenzene/vinylbenzyl chloride (CS@AN/DVB/VBC-ED) and styrene/divinylbenzene/vinylbenzyl chloride (CS@ST/DVB/VBC-ED) for defluoridation of water. Under batch mode, various influencing parameters like shaking time, pH, competitor ions and temperature were optimized. The fluoride removal was reasonably explained using Freundlich, Langmuir and D-R isotherms. The thermodynamic parameters viz., ΔG°, ΔH° and ΔS° indicates the nature of the fluoride sorption with the sorbents. The FT-IR, XRD and SEM with EDAX analysis were used to study the fluoride adsorption of CS@AN/DVB/VBC-ED and CS@ST/DVB/VBC-ED blends. The thermal stability of both the sorbents was tested using TGA/DSC analysis. Studies were also conducted to test the potential application of the prepared polymeric blends for fluoride removal from field water collected from the nearby fluoride endemic area.
authors.affiliation: Department of Chemistry, The Gandhigram Rural Institute - Deemed University, Gandhigram, 624 302, Tamil Nadu, India.
authors.forename: Subbaiah Muthu
authors.initials: SM
authors.lastname: Prabhu
authors.affiliation: Department of Chemistry, Anna University, University College of Engineering-Dindigul, Dindigul, 624 622, Tamil Nadu, India.
authors.forename: Natrayasamy
authors.initials: N
authors.lastname: Viswanathan
authors.affiliation: Department of Chemistry, The Gandhigram Rural Institute - Deemed University, Gandhigram, 624 302, Tamil Nadu, India. Electronic address: drs_meena@rediffmail.com.
authors.forename: Sankaran
authors.initials: S
authors.lastname: Meenakshi
mesh_terms: D000327:Adsorption; D002152:Calorimetry, Differential Scanning; D048271:Chitosan / Q000737:chemistry*; D060766:Drinking Water / Q000737:chemistry / Q000592:standards; D005029:Ethylenediamines / Q000737:chemistry*; D005459:Fluorides / Q000009:adverse effects* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014961:X-Ray Diffraction
chemical_list: D060766:Drinking Water; D005029:Ethylenediamines; D007477:Ions; D011108:Polymers; C031234:ethylenediamine; D048271:Chitosan; D005459:Fluorides
keywords: Adsorption; Chitosan; Field study; Fluoride; Isotherms; Synthetic resins