The development of new supported liquid membranes (SLMs) with agents: Methyl cholate and resorcinarene as carriers for the removal of dichromate ions (Cr2O72−)

The technique of SLMs was used to achieve the facilitated extraction of Cr2O72− ions, using methyl cholate and resorcinarene as carriers, widely used for facilitated transport of carbohydrates. For our SLMs, toluene as organic phase and microporous film of PVDF as support. Permeability P and initial flux J0 were determined for different temperatures and the prepared membranes are highly permeable. The results indicate that values of the parameter J0 depend on the temperature according to the Arrhenius equation. The activation parameters, (Ea, ΔH≠ and ΔS≠) for transition state on the association reaction substrate–carrier were determined. The mechanism based on the complexation of the substrate by the carrier and the diffusion of the complex (ST) was developed. Results are used to determine the parameters, association constant Kass and apparent diffusion coefficient D*. All studies show that parameters Kass and D* are changing significantly with temperature factor, and better extraction of Cr2O72− ions is possible.