Transport Kinetics of Hg²⁺ Through Bulk Liquid Membrane Using Calix[4]arene Ketone Derivative as Carrier

Abstract

In this article, calix[4]arene ketone derivative was used as a carrier to transport Hg²⁺ ions from an aqueous solution into an aqueous receiving solution. The kinetic parameters (k ₁, k ₂, R _m ^max, t _max, J _d ^max, J _a ^max) were investigated with influence of temperature, the solvent, and stirring rate and analyzed in the formation of two consecutive, irreversible first order reactions. The membrane entrance rate, k ₁, and the membrane exit rate, k ₂, constants were increased with temperature and stirring rate and found to be dependent on the solvent type in the order CH₂Cl₂ > CHCl₃ > CCl₄. The activation energy was obtained as 5.28 kcal/mol from the slope of the Arrhenius plot for the case of maximum membrane exit flux, J _a ^max. This value indicates that the process is controlled by species diffusion.

Keywords:

• Liquid membrane
• Transport kinetics
• Temperature effects
• Diffusional rate‐determining step
• Calixarenes

Acknowledgment

The authors are grateful for the financial support provided by Selcuk University Research Foundation (SUAF) under project FBE 2001/026.