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Speciation of lanthanide ions in the organic phase after extraction from nitrate media by basic extractants

机译：用碱性萃取剂从硝酸盐培养基萃取后有机相中镧系元素的形态

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摘要

A speciation study was carried out for lanthanide complexes formed in the organic phase after solvent extraction with quaternary ammonium and phosphonium nitrate extractants. These extractants are liquid at room temperature and were applied in their undiluted form. A comparison was made between the quaternary compound trihexyl(tetradecyl)phosphonium nitrate, the nitrate form of the commercial extractant Cyphos IL 101, and Aliquat 336 nitrate, the nitrate form of the commercial trialkylmethylammonium chloride extractant Aliquat 336 (alkyl = mixture of C8 and C10 chains). The structures of the lanthanide complexes across the entire lanthanide series (with the exception of promethium) were determined by a combination of solvent extraction techniques, FTIR, NMR, high-resolution steady-state luminescence spectroscopy, luminescence life time measurements, elemental analysis and EXAFS spectroscopy. The results suggest that the lanthanide ions form an anionic nitrate complex in the organic phase by coordinating with five bidentate nitrate ligands. Charge neutralization is provided by two counter cations of the extractant present in the outer coordination sphere of the complex. Furthermore, it is suggested that the pentanitrato complex is the sole lanthanide species that is formed in significant concentrations in the organic phase.
机译：甲形态研究是为形成在有机相中与季铵和硝酸鏻萃取溶剂萃取后镧系络合物进行。这些萃取剂是在室温下为液体，并在其未稀释的形式施加。了比较季化合物三己基（十四烷基）鏻硝酸盐，商业萃取Cyphos IL 101的硝酸盐形式，和季铵氯化物336硝酸盐，商业三烷基氯萃取剂的Aliquat 336（烷基= C8和C10的混合物的硝酸盐形式之间进行链）。通过溶剂萃取技术，FTIR，NMR，高分辨率稳态发光光谱，发光寿命时间的测量，元素分析和EXAFS的组合来确定在整个镧系镧系元素复合物（与钷除外）的结构光谱。结果表明，镧系元素的离子通过有五个硝酸二齿配体配位形成在有机相中的阴离子硝酸盐络合物。电荷中和是由萃取剂中存在的复合物的外配位球的两个抗衡阳离子提供。此外，还建议pentanitrato复杂的是，形成在显著浓度在有机相中的唯一的镧系元素的种类。

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  • 来源
    《RSC Advances》 |2018年第56期|共11页
  • 作者

    Onghena Bieke; Papagni Eleonora; Souza Ernesto Rezende; Banerjee Dipanjan; Binnemans Koen; Vander Hoogerstraete Tom;

  • 作者单位

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

    Katholieke Univ Leuven Dept Chem Celestijnenlaan 200F Bus 2402 B-3001 Heverlee Belgium;

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  • 正文语种 eng
  • 中图分类 化学;
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