Methyl Cholate and Resorcinarene New Carriers for the Recovery of Cr(III) Ions by Supported Liquid Membranes (SLM)s

Abstract

The technique of supported liquid membranes was used to achieve the\rfacilitated transport of Cr(III) ions, using tow amphiphilic carriers, the\rmethyl cholate and resorcinarene. For prepared SLMs, toluene as organic phase\rand film of polyvinylidene difluoride, as hydrophobic polymer support with 100 μm\rin thickness and 0.45 μm as the diameter of the pores. The macroscopic parameters (P and J0) on the transport\rof these ions were determined for different medium temperatures. For these\rdifferent environments, the prepared SLMs were highly permeable and a clear\revolution of these parameters was observed. The parameter J0 depended on the temperature according to the\rArrhenius equation. The activation parameters, Ea, ΔH≠ and ΔS≠, for the transition state\ron the reaction of complex formation (ST) , were determined. To explain these results for\rthis phenomenon, and achieve a better extraction of the substrate, a model\rbased on the substrate complexation by the carrier and the diffusion of the\rformed complex (ST) was\rdeveloped. The experimental results verify this model and determine the microscopic parameters (Kass and D*). These studies show that these parameters Kass and D* are specific to facilitated transport of Cr(III) ions\rby each of the carriers and they are changing significantly with temperature.