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Post Graduate and Research Department of Chemistry, Department of Advanced Zoology and Biotechnology, Sri Paramakalyani College, Alwarkurichi-627 412, Tamilnadu, India E-mail : alagupathi@yahoo.co.in Manuscript received 27 April 2007, revised 27 September 2007, accepted 9 October 2007 The kinetics and thermodynamics of fluoride ions sorption on fire clay from aqueous solution have been investigated. The various factors that influence the defluoridation efficiency of the material were studied. Adsorption obeyed both Langmuir and Freundlich isotherm models. Various thermodynamic parameters such as ΔGº, ΔHº and ΔSº were calculated indicating that this system was a spontaneous one and endothermic in nature. FTIR studies showed the involvement of hydroxyl group on the surface in the adsorption interaction. |
