Kinetic and Equilibrium Studies of Chromium(III) Removal by Macroporous Ion Exchanger Amberlyst‐15 (H⁺)

Abstract

Chromium(III) sorption on macroporous strong cation exchanger Amberlyst-15 (H ＋ ) was studied as a function of time and temperature. The rate constant values for chromium(III) sorption were calculated both for film and particle diffusion processes. The temperature was found to have a positive effect on both the diffusional processes. From the rate constant values, the energy of activation was calculated using the well-known Arrhenius equation.The high values of energy of activation confirmed the film diffusional nature of the process. Equilibrium data were explained with the help of Langmuir equation. Various thermodynamic parameters ( H ∆ , S ∆ and G ∆ ) from chromium(III) exchange on the resin were calculated. The G ∆ values were found to be negative while both the H ∆ and S ∆ were positive.