Selective Permeation of Plutonium (IV) through a Supported Liquid Membrane Containing Tri-iso-amyl Phosphate as an Ionophore

概要

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Selective ionophoric mobility of plutonium with ease of concentration upgradation from aqueous nitrate solutions was investigated. A thin flat-sheet supported liquid membrane (SLM) impregnated with tri-iso-amyl phosphate (TAP) was used. Accurel polypropylene hydrophobic microporous membrane Enka was tested as the solid polymeric support. The source phase generally contained extremely dilute (ca. 10-6mol/dm-3) to moderately concentrated plutonium(IV) nitrate solutions (ca. 10-3mol/dm-3) in about 4mol/dm-3 HNO3. Membrane permeability and selectivity dependency on variables like nitric acid concentration in the source phase, carrier concentration, receiving phase composition, etc. were systematically evaluated. More than 90% pertraction of plutonium could be easily accomplished in single run employing a feed solution consisting of about 1mg/dm-3 Pu and 4mol/dm-3 HNO3, carrier concentration of 0.8mol/dm-3 TAP/dodecane; the receiving phase was 0.5mol/dm-3 sodium carbonate or 0.5mol/dm-3 ascorbic acid. The selective diffusivity of plutonium(IV) was observed from various effluents originating from fuel reprocessing operations. Reusability of membrane supports was also found to be satisfactory.
社団法人日本原子力学会の論文
1998-06-25