Membrane material effect on copper coupled transport through liquid membranes

• Published in: Journal of membrane science Vol. 64; no. 1; pp. 129 - 143
• Main Authors: Szpakowska, Mariola, Nagy, Ottó B.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.11.1991; Elsevier
• Subjects: Chemistry; Colloidal state and disperse state; copper transport; coupled, facilitated transport; diffusion; Exact sciences and technology; facilitated transport; General and physical chemistry; liquid membranes; Membranes; transport kinetics; diffusion; transport kinetics; coupled, facilitated transport; facilitated transport; liquid membranes; copper transport; Viscosity; Transition metal Ions; Hydrocarbon; Ion transfer; Liquid membrane; Kinetics; Diffusion; Experimental study; Copper II Ions; Physicochemical properties
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/0376-7388(91)80084-J

The influence of the physico-chemical properties of the membrane material on coupled transport of Cu(II) is investigated using light organic solvents belonging to different solvent classes. The kinetics of transport could be analyzed in the formalism of two consecutive irreversible first order reactions. The rate determining step is the diffusion across the membrane boundary layer. Detailed analysis allowed to determine the conditions required for steady-state transport. Permeation rates turn out to be less sensitive to medium effects than membrane exit rates. In all cases general solvent effects (polarity, polarizability) dominate the observed kinetics without excluding completely specific effect (π-donor ability). The results suggest that medium effects influence more the initial state than the transition state of diffusion. Among the solvents used open-chain paraffins appear to be the most efficient membrane materials.