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Thermal-swing extraction separation of Am(III) and Eu(III) by thermosensitive gel with encapsulating ligand

Takeshita, Kenji*; Ogata, Tsuyoshi*; Nakano, Yoshio*; Matsumura, Tatsuro  ; Mori, Atsunori*

Extraction separation of Am(III) and Eu(III) was examined by the thermal-swing extraction technique using a thermosensitive gel, NIPA (poly-N-isopropylacrylamide) copolymerized with an encapsulating ligand, TPEN derivative called TPPEN (N,N,N',N'-tetrakis(4-propenyloxy-2-pyridylmethyl)ethylenediamine). The separation of Am(III) from Eu(III) was observed in the swollen state of gel (5$$^{circ}$$C) and the separation factor of Am(III) was evaluated as about 18 at pH5.2. More than 90% of Am(III) extracted into the gel was released by the volume phase transition of gel from the swollen state (5$$^{circ}$$C) to the shrunken one (40$$^{circ}$$C). The radiation effect of gel on the extraction of Am and Eu was tested by the irradiation of $$gamma$$-ray (10 kGy) and the long-term adsorption of $$alpha$$-emitter ($$^{244}$$Cm). The TPPEN-NIPA gel sustained no damage by these radiation tests. These results suggest that the thermal-swing extraction technique is applicable to the MA partitioning process indispensable for the establishment of P&T technology.

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