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Potentiality of Aquatic Macrophyte (Pistia Sp.) Towards Removal of Fluoride from Aqueous Medium

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Abstract. Excessive intake of fluoride through drinking water leads to both dental and skeletal fluorosis. Therefore, it is prime concern to reduce F concentration from drinking water. Present study highlighted the potentiality floating macrophyte Pistia sp. biomass towards removal of F from aqueous solution under various operating variables such as pH, adsorbent dose, contact time, initial concentration, particle size, stirring rate and temperature. The equilibrium adsorption data were analyzed using Langmuir, Freundlich, D-R and Temkin adsorption isotherm models. The kinetics of the F adsorption was studied by using Pseudo-first-order, Pseudo-second-order, intraparticle diffusion and kinetics models. The results revealed that maximum uptake value of F was 4.337 mg/g at pH 8.0 during 120min with 0.8 g/0.1L Pistia biomass and an initial F concentration of 35 mg/L. The F adsorption equilibrium data nicely fitted D-R isotherm and pseudo-second-order kinetics model. The thermodynamic analysis showed that the adsorption of F onto Pistia biomass was exothermic and spontaneous.

Keywords: Adsorption, Fluoride, Isotherm, Pista biomass

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