Abstract
Abstract Studies of the extraction of copper with liquid surfactant membranes containing a mobile carrier were conducted in a stirred transfer cell. It was found that: (1) the resistance of the diffusion step in liquid surfactant membranes is negligible compared with that of the diffusion step accompanied with chelating complex formation in the outer aqueous solution, (2) the initial rate of copper extraction varied inversely as the 0.5 power of hydrogen-ion concentration in the low-pH range, but in the high-pH range was not affected by hydrogen-ion concentration, (3) the initial rate of copper extraction was proportional to the concentration of benzoylacetone, which is the mobile carrier in the membranes, in the low-pH range, but the rate was scarcely affected by benzoylacetone concentration in the high pH and benzoylacetone concentration ranges. These results are consistent with a model of liquid surfactant membranes which is presented.
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