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Preparation of novel silica-based R-BTP extraction-resins and their application to trivalent actinides and lanthanides separation

シリカを基材とした新しいR-BTP抽出樹脂の調整と3価アクチニドとランタノイドの分離への応用

Wei, Y.*; 星 陽崇*; 熊谷 幹郎*; 朝倉 俊英; 内山 軍蔵*

Wei, Y.*; Hoshi, Harutaka*; Kumagai, Mikio*; Asakura, Toshihide; Uchiyama, Gunzo*

われわれは、長寿命マイナーアクチノイドとZr, Moのような核分裂生成物を高レベル廃液から分離するため、用いる有機溶媒が最小量で済み、装置がコンパクトな抽出クロマトグラフィーによる高度な群分離プロセスを研究してきた。本研究では、新しい窒素ドナー配位子である、種々のアルキル基を持つ2,6-bi-(5,6-dialkyl-1,2,4-triazine-3-yl)-pyridine (R-BTP)を合成して、これらの配位子が直径50$$mu$$mのSiO$$_{2}$$-P担体に担持された、シリカを基材とした新しい抽出樹脂を調製して、$$^{243}$$AmとLn(III)の硝酸溶液からの吸着について検討した。その結果、吸着挙動がR-BTPのアルキル基に強く依存し、${it n}$Bu-BTP/SiO$$_{2}$$-Pと${it n}$Hex-BTP/SiO$$_{2}$$-Pが、高いAm(III)について、高い吸着性とLn(III)に対する選択性を持つことがわかった。分離係数としては、Am/Ceについて約10$$^{4}$$、Am/Eu-Gdについて約10$$^{2}$$が得られ、これら抽出樹脂を用いた抽出クロマトグラフィーにより、効果的にAm(III)をLn(III)から分離できると期待される。

To separate long-lived minor actinides and specific fission products such as Zr and Mo from nitrate acidic high-level liquid waste, we studied an advanced partitioning process by extraction chromatography using minimal organic solvent and compact equipment. In this work, we synthesized several new type of nitrogen donor ligands, 2,6-bi-(5,6-dialkyl-1,2,4-triazine-3-yl)-pyridine (R-BTP) with different alkyl groups and prepared novel silica-based extraction-resins by impregnating these ligands into the SiO$$_{2}$$-P support with a diameter of 50 $$mu$$m. The adsorption performance of $$^{243}$$Am and Ln (III) from nitrate solution was investigated. It was found that the adsorption behavior depends strongly on the alkyl group in R-BTP. ${it n}$Bu-BTP/SiO$$_{2}$$-P and ${it n}$Hex-BTP/SiO$$_{2}$$-P showed high absorbability and selectivity for Am (III) over Ln (III). The separation factor is about 10$$^{4}$$ for Am/Ce and near 10$$^{2}$$ for Am/Eu-Gd, respectively. Effective Am (III) separation form Ln (III) by extraction chromatography using R-BTP/SiO$$_{2}$$-P extraction-resins is expected.

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