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Report No.

Separation of Actinide(III) from Lanthanide(III) by thermosensitive gel copolymerized with TPEN derivatives

Takeshita, Kenji*; Fugate, G.*; Matsumura, Tatsuro  ; Nakano, Yoshio*; Mori, Atsunori*; Fukuoka, Sachio*

Extraction separation of Am(III) and Eu(III) was examined by the thermal-swing extraction technique using a thermosensitive gel, poly-$$N$$-isopropylacrylamide (NIPA) copolymerized with a TPEN derivative, $$N,N,N',N'$$-tetrakis(4-propenyloxy-2-pyridylmethyl)ethylenediamine (TPPEN). 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 repetition test for the thermal swing extraction of a soft metal ion, Cd(II), which was used as a substitute of Am(III), was carried out and the extraction and release of Cd(II) were repeated three times stably under the thermal-swing operation between 5$$^{circ}$$C and 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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