Abstract
The extraction mechanism of metal ion by acidic organophosphorus extractant was discussed by taking into account the physicochemical properties of extractant. Since the acidity of the extractant is higher than that of chelating agent, the rate of complex formation of metal ion with the extractants is rapid compared to that with the chelating agents. It is found that the rate determining step of the extraction such as Cu(II) and Co(II) by 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester is not the complex formation at the interface, but the diffusion of the metal complex in the organic stagnant film, which is instantaneously formed at the interface. This result was also confirmed by the stirring speed dependence of the initial extraction rate. Furthermore, the time course of Co(II) extraction from the initial stage to the equilibrium state was quantitatively interpreted by considering only the diffusion rates of reactants and products in both stagnant films.
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