TITLE:
Methyl Cholate and Resorcinarene New Carriers for the Recovery of Cr(III) Ions by Supported Liquid Membranes (SLM)s
AUTHORS:
Abdelkhalek Benjjar, Tarik Eljaddi, Oussama Kamal, Laurent Lebrun, Miloudi Hlaibi
KEYWORDS:
Supported Liquid Membrane; Facilitated Transport; Methyl Cholate; Resorcinarene Permeability; Flux; Association Constant; Diffusion Coefficient
JOURNAL NAME:
Open Journal of Physical Chemistry,
Vol.3 No.3,
August
6,
2013
ABSTRACT: The technique of supported liquid membranes was used to achieve the
facilitated transport of Cr(III) ions, using tow amphiphilic carriers, the
methyl cholate and resorcinarene. For prepared SLMs, toluene as organic phase
and film of polyvinylidene difluoride, as hydrophobic polymer support with 100 μm
in thickness and 0.45 μm as the diameter of the pores. The macroscopic parameters (P and J0) on the transport
of these ions were determined for different medium temperatures. For these
different environments, the prepared SLMs were highly permeable and a clear
evolution of these parameters was observed. The parameter J0 depended on the temperature according to the
Arrhenius equation. The activation parameters, Ea, ΔH≠ and ΔS≠, for the transition state
on the reaction of complex formation (ST) , were determined. To explain these results for
this phenomenon, and achieve a better extraction of the substrate, a model
based on the substrate complexation by the carrier and the diffusion of the
formed complex (ST) was
developed. 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
by each of the carriers and they are changing significantly with temperature.