Cinétiques et isothermes de fixation de Zn (II)‎ et Cd (II)‎ sur des résines échangeuses de cations

Abstract EN

Relatively recent methods as ion exchange chromatography and solvent extraction have been widely used to separate trace metals.

For those whose properties are close similar, the complexation by different ligands allowed to emphasize the role of the medium and led to improve the separations.

According to their great chemical and thermal stability and to the variety of their functional groups, the polymers like resins are being more and more used in analyze and in some industrial processes.

The present paper is a contribution to the study of the retention of metals on Amberlite IRC-50, Dowex-50 X8 and Permutit C-67.

Batch experiments performed in pure water showed a relatively high affinity of these elements to the exchanger resins.

The main phenomenon controlling the kinetics is likely ion exchange.

The observed rapid kinetics (the equilibrium was reached in 30 to 60 min) are favourable factors in term of retention of metals whose properties are similar to those of cadmium and zinc.

Zn2+ and Cd2+ ions used less than 91 % of the total capacity of the studied resins.

Our results show that the isotherm nearly obeys a Langmuir-type law like those obtained by other experiments on the sorption of transition metals on inorganic compounds, conducted elsewhere and also reported in this paper.