Abstract
Using newly synthesized surfactants, extraction of zinc ion with liquid surfactant membranes (LSMs) containing 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester ( PC-88A) as a carrier was carried out in a stirred cell. The adsorption properties of surfactants were clarified and the effects of new surfactants on zinc extraction by LSMs were studied. New surfactants having two oleyl chains form stable emulsions in an even lower concentration range than the commercial surfactants. The extraction rate of zinc by LSMs was explained by an interfacial reaction model between the carrier and zinc ion taking into account the adsorption of a surfactant at the interface. Additionally, it is found that the new cationic surfactants appeared to accelerate the extraction rate due to an electrostatic interaction with the carrier.
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