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論文

Lanthanide intra-series separation by a 1,10-phenanthroline derivative; Counterion effect

Simonnet, M.; 鈴木 伸一; 宮崎 有史*; 小林 徹; 横山 啓一; 矢板 毅

Solvent Extraction and Ion Exchange, 38(4), p.430 - 440, 2020/00

 被引用回数:15 パーセンタイル:71.68(Chemistry, Multidisciplinary)

Separation of lanthanides is especially challenging because of their chemical similarities. Therefore, improving the separation process is essential. In this work, we present the effect of the counterion nature on the lanthanide extraction by a 1,10-phenanthroline derivative, the $$N$$-octyl-$$N$$-tolyl-1,10-phenanthroline-2-carboxamide. Modification of the counterion yields a drastic change in selectivity, with a shift in the maximum of extraction from the light lanthanides (Pr, Nd, Sm) in nitrate system to the heavy lanthanides (Dy, Ho) in perchlorate system. Other salts (NaCl, NaNO$$_{2}$$) showed a gradual increase in extraction along the whole lanthanide series, or no effect (Na$$_{2}$$SO$$_{4}$$). The difference was explained by different coordination in the organic phase. The reversed behaviour depending on the anion is especially interesting because a cycling extraction/back-extraction of light lanthanides in nitrate/chloride media or a cycling extraction/back-extraction of heavy lanthanides in perchlorate/nitrate media can enhance the separation factors of respectively Nd and Dy/Ho.

口頭

1,10-phenanthroline carboxamide ligands for lanthanide separation; Diluent effect

Simonnet, M.; 小林 徹; 鈴木 伸一; 矢板 毅

no journal, , 

Efficient separation of rare-earth elements has recently been under a renewed interest. One of the most common elemental separation method is liquid-liquid extraction, for which the state of the art is wide due to the similarities with the studies on actinides separation from lanthanides. Therefore, many different extractants can be found in literature, among which 1,10-phenanthroline-based ligands have shown a strong ability for the extraction of trivalent elements. In this study, we focused on 1,10-phenanthroline carboxamide compounds, because they can selectively extract one lanthanide from the series, with the nature of this lanthanide dependent on the extractant structure. Some compounds were tested in different media, and it was found that the nature of the diluent and the composition of the aqueous feed also yield to a maximum shift among the lanthanide series. This study thus aims at emphasizing diluent effect on lanthanide extraction by 1,10-phenanthroline carboxamide ligands.

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