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Extraction separation of Am(III) and Eu(III) with thermosensitive gel introducing TPEN derivatives

TPEN誘導体を導入した感温性ゲルによるAm(III)とEu(III)の抽出分離

竹下 健二*; 中野 義夫*; 松村 達郎 ; 森 敦紀*

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

Am(III)とEu(III)の分離を目指し、NIPA(N-isopropylacrylamide)とTPENの誘導体の一つであるTPPEN(N,N,N',N'-tetrakis(4-propenyloxy-2-pyridylmethyl)ethylenediamine)を共重合した感温性ゲルを用いた温度スイングクロマトプロセスの開発を進めている。まず、TPPEN-NIPAゲルの耐放射線性の確認のため、$$gamma$$線照射試験及び$$alpha$$核種長期吸着試験を実施し、これらによる吸着特性への影響が問題ないことを確認した。次に、多孔質シリカ粒子にTPPEN-NIPAゲルを固定し、分離性能を確認した。Am(III)は低温(5$$^{circ}$$C)において抽出され、Euとの分離係数は3.7であった。また5$$^{circ}$$Cから40$$^{circ}$$Cに温度変化させることによって、Am(III)の分配係数は1/20に減少した。これらの結果は、TPPEN-NIPAゲルによる温度スイングクロマトプロセスのMA分離への適用性を示している。

A thermal-swing chromatographic process using a thermosensitive gel copolymerized with NIPA (N-isopropylacrylamide) and TPPEN (N,N,N',N'-tetrakis(4-propenyloxy-2-pyridylmethyl)ethylenediamine) was studied for the separation of Am(III) from Eu(III). Firstly, the radiolysis of the TPPEN-NIPA gel was tested by the $$gamma$$-ray irradiation and the $$alpha$$ nuclide adsorption. The extraction separation of Am(III) was not influenced in the radioactive environment of the proposed process. Next, the TPPEN-NIPA gel was immobilized in porous silica particles and the applicability of the gel-immobilized silica to the proposed process was tested. Am(III) was extracted selectively in the gel-immobilized silica at 5$$^{circ}$$C and the separation factor of Am(III) over Eu(III) was evaluated to be 3.7. The distribution ratio of Am(III) was reduced to less than 1/20 by increasing temperature from 5$$^{circ}$$C to 40$$^{circ}$$C. These results indicate that the TPPEN-NIPA gel is applicable to the thermal-swing chromatographic process for the MA recovery.

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