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首页> 外文期刊>Journal de Chimie Physique et de Physico-Chimie Biologique >Transposition des processus membranaires biologiques aux traitements des effluents metalliferes peu charges. Conception et etude chimique d'une pompe ionique uranifere. Transport, contre-transport, couplage positif
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Transposition des processus membranaires biologiques aux traitements des effluents metalliferes peu charges. Conception et etude chimique d'une pompe ionique uranifere. Transport, contre-transport, couplage positif

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An ionic pump has been devised thanks to a "liquid-liquid" extraction-reextraction where the extraction compartment and the reextraction compartment are put in contact with one another through the membrane composed of an mediator diluted in the kerosene. We have applied this process to the system: uranyle nitrate, nitric acid-phosphate tributyle, kerosene-sodium carbonate. Interesting performances have been realised for diluted solutions (100 ppm). The chemicals parameters has allowed to obtain the variables giving the extraction and reextraction efficiency optimum. A chemical modelisation has allowed to identify the extraction mechanism. The classical behaviour obtained in agitated surroundings has been found again. The membrane can work thanks to the "activation" by the solute of the carrier at one interface and to the "deactivation" at the other interface, both of these mechanisms of the active transport creating a real "ionic pumping".

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