engleski

Equilibrium study of copper ions adsorption on the natural clinoptilolite-rich zeolitic tuff

In this study the influence of particle size on adsorption of copper ions on the natural clinoptilolite-rich zeolitic tuff was studied in batch reactor at the temperature of 25°C and with the stirring speed of 200 rpm. The appropriate amount of three different fractions (45-71 µm, 71-90 µm, and 90-125 µm) of the zeolitic tuff was placed into copper (II) nitrate solution of various concentrations and mixed until equilibrium was reached. The adsorbed amount of copper ions firstly increases with increasing of the initial copper concentration reaching its maximum at the copper concentration of 11.763 mmol dm-3 for all fractions of the zeolitic tuff. Langmuir and Freundlich isotherm models were used to fit the experimental adsorption data. Based on the correlation coefficient, the best fit of the experimental data was achieved with the Langmuir adsorption model, for all three particle sizes of the zeolitic tuff.

copper, natural untreated clinoptilolite-rich zeolitic tuff, adsorption isotherms, equilibrium

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