Abstract
Co(II) and Fe(III) transport through a supported liquid membrane consisting of a microporous nitrocellulose film (Synpor) immobilizing a tri-n-octylamine (TOA) as a carrier and n-decane as a liquid membrane matrix, has been investigated. Membrane transport was evaluated by measuring the 60Co- and 59Fe-radioactivity in the strip solution. The conductivity of the extracted compounds through the membrane was also measured. A maximum in the curve of Co(II) flux vs. TOA concentration was found. This maximum in flux was shown to occur at the same (e.g. 1.8 M) TOA concentration as the main maximum in the conductivity. It was shown that this phenomenon can be connected with a changing from the common transport mechanism to so-called “jumping” membrane transport which previously theoretically has been predicted by Cussler [J. Membrane Sci., 43 (1989) 149]. Such membrane transport is realized in a relatively narrow interval of the carrier (TOA) concentration and may be more effective than the common facilitated diffusion mechanism. To obtain the described effect one needs to hold such a supported liquid membrane under transfer conditions during a certain period of time, in order for the membrane medium in the “jumping” region to become self-organized and self-fitted for the membrane transport process.
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