Szpakowska, M.
Nagy, OB.
The coupled transport of copper(II) ions by the carrier Acorga P-50 through mono and binary liquid membranes has been analysed in the steady-state approximation. The membranes were composed of C-8-C-14 normal chain paraffins and their mixtures. It was found that the total ion fluxes are the most appropriate kinetic parameters for asymmetric membranes in the steady-state approximation. The results obtained for single component (mono) membranes have shown the importance of the physicochemical nature of membrane material. In all cases transport rates were diminished by increasing viscosity and by increased copper(II)-carrier-membrane interactions, as governed by general solvent effects (polarity and polarizability). Using binary solvent mixtures as the membrane a surprising variety of substitution profiles have been obtained, despite the very similar chemical character of the membrane components. The regular substitution profile obtained for the n-octane (S)-n-tetradecane (Z) solvent pair could be analysed successfully by COPS theory. The results confirmed quantitatively the decisive role played by molecular interactions in transport kinetics. A simple molecular model is proposed to explain the dominating role played by membrane polarity in determining transport rates. The general conclusions support fully those obtained previously for non-steady state kinetic conditions.
Bibliographic reference |
Szpakowska, M. ; Nagy, OB.. Effect of Physicochemical Properties of Binary-liquid Membranes On Steady-state Transport of Copper(ii) Ions. In: Polyhedron, Vol. 12, no. 11, p. 1277-1288 (1993) |
Permanent URL |
http://hdl.handle.net/2078.1/49647 |