engleski

Equilibrium and kinetics studies for the Adsorption of Fluoride onto commercial activated carbons using fluoride ion-selective electrode

This paper reports the potentiometric determination of fluoride adsorbed onto four commercials granular activated carbons from aqueous solution under three temperature regime and various conditions: pH (4-9), initial fluoride concentration (2-40 mg/L), dosage of activated carbon (2-20 g/L) and contact time (15-360 min). The maximum fluoride uptakes for all tested activated carbons were obtained when 10 mg/L activated carbons were used at pH 5 and adsorption time 360 min. Obtained dada were fitted using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms showing that Freundlich isotherm model gave the best description of fluoride adsorption onto used activated carbons. The various kinetic models viz., pseudo-first-order, pseudo-second-order, intra-particle diffusion and Elovich models were used to describe the kinetic of fluoride adsorption at 25, 35°C and 45°C.

potentiometric method ; fluoride determination ; fluoride removal ; activated carbon ; isotherms ; kinetics

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