engleski

Kinetic modelling of Fe3+ ion uptake by zeolite from water

The ability of the natural clinoptilolite (Cp), and its Na–enriched form (Na–Cp) to remove iron ions from acid aqueous solutions was investigated in the batch system at the initial concentration of 100 mg Fe3+/L, pH value of 1.90, and the equilibration time of 30–300 min. In order to establish the Fe3+ uptake behaviour, the rate controlling step of the process and to determine the coefficients, the ion exchange kinetics has been investigated and the different models usually applied were used for description of adsorption kinetics. The Fe3+ uptake by Cp and Na-Cp was evaluated based on the first–order kinetics, modified Freundlich and Elovich models, parabolic diffusion and heterogeneous diffusion models. Developed models can successfully describe the ion exchange processes between Fe3+:Cp and Fe3+:Na–Cp. In addition, the results showed that the natural Croatian clinoptilolite enabled efficient removal of iron from water.

clinoptilolite ; diffusion model ; iron removal ; kinetic models ; sorption

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