Different types of water-soluble ligands were synthesized and their capability was evaluated by solvent extraction studies to complex trivalent actinides and suppress their extraction by a strong lipophilic ligand, such as TODGA. The back extraction efficiency of hydrophilic diglycolamide (DGA) derivatives with a varying number of ethylene glycol groups, or containing sodium acetate moieties on the amidic nitrogen shows a decrease in back-extraction efficiency with increasing number of ethylene glycol units on the amidic nitrogen at various pH values of the aqueous phase. Among the PS donating ligands only the ligand with a malonamide backbone exhibits a high reverse extraction efficiency, although, with no selectivity for americium. Within the water-soluble tripodal ligands, i.e. the amide derivatives of nitrilotriacid with N,N-dimethyl and N,N-bis(hydroxyethyl) moieties, the first one shows a pronounced selectivity for Am(III) over Eu(III), with a maximum separation factor of 11.1, while the latter one more efficiently complexes the radionuclides in the aqueous phase with a maximum separation factor of 5. Isothermal microcalorimetry experiments of the complexation of Eu(III) by a selected series of ligands confirm the observed trend in the back extraction properties.
合成了不同类型的
水溶性
配体,并通过溶剂萃取研究评估了它们络合三价
锕系元素的能力,并通过强亲脂
配体(例如 TODGA)抑制其萃取。具有不同数量
乙二醇基团或酰胺氮上含有
乙酸钠部分的亲
水性
二甘醇酰胺 (DGA) 衍
生物的反萃取效率表明,随着不同温度下酰胺氮上
乙二醇单元数量的增加,反萃取效率会降低。
水相的pH值。在 PS 供体
配体中,只有具有丙二酰胺主链的
配体表现出高反萃取效率,但对
镅没有选择性。在
水溶性三足
配体(即带有 N,N-二甲基和 N,N-双(羟乙基)部分的次氮基三酸的酰胺衍
生物)中,第一个
配体对 Am(III) 表现出比 Eu(III) 显着的选择性,其中最大分离因子为 11.1,而后者更有效地络合
水相中的放射性核素,最大分离因子为 5。通过一系列选定的
配体络合 Eu(III) 的等温微量热实验证实了观察到的趋势反萃取特性。