Laboratoire d’Electrochimie et des Procédés Membranaires de l’Ecole Supérieure Polytechnique, Université Cheikh Anta DIOP de Dakar, BP : 5085 Fann, Senegal
This article studies the elimination of fluorine in aqueous solution by calcined bone has been implemented. Series of experiments were carried out to study the influence of certain parameters on the adsorption rate such as: particle size, stirring speed, contact time, adsorbent mass and pH. The results obtained show that the calcined bones adsorb the fluorine quite rapidly during the first minutes to reach a defluorination efficiency of 85% after 60 minutes of contact between the adsorbent-adsorbate. The kinetics of adsorption of fluorine by calcined bones shows a better fit to the second order model with a regression coefficient of 0.9919. The tests carried out make it possible to determine the type of adsorption, which is in agreement with the BET model with a regression coefficient very close to unity. The thermodynamic parameters obtained reveal that the adsorption is spontaneous and exothermic.
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