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稀释剂对用,,','-四辛基二甘醇酰胺（TODGA）萃取铕（III）和镅（III）的影响。

Effect of diluent on the extraction of europium(iii) and americium(iii) with ,,','-tetraoctyl diglycolamide (TODGA).

作者信息

Kajan Ivan, Florianová Markéta, Ekberg Christian, Matyskin Artem V

机构信息

Laboratory of Radiochemistry, Paul Scherrer Institute 5232 Villigen Switzerland

Department of Nuclear Chemistry, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University Brehova 7 11519 Prague 1 Czech Republic.

出版信息

RSC Adv. 2021 Nov 16;11(58):36707-36718. doi: 10.1039/d1ra07534a. eCollection 2021 Nov 10.

DOI:10.1039/d1ra07534a
PMID:35494375
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9043636/
Abstract

Solvent extraction of Eu and Am ,,','-tetraoctyl diglycolamide (TODGA) dissolved in different molecular diluents was studied. The diluent types used in this work were primary and secondary alcohols, secondary ketones and alkanes. Effects of concentration of extracting agent, temperature, diluent type and its carbon chain length on the extractions were determined. Distribution ratios of Eu and Am showed high dependence on the diluent type as well as the carbon chain length within the same type of diluent. The highest distribution ratios for both Eu and Am as well as the separation factors of Eu over Am were observed in the alkane diluents. Unexpectedly high distribution ratios for Eu and Am were observed in polar diluents with 5 carbon atoms in the chain, clearly standing out against the general trends. It was found that Eu and Am extraction TODGA is enthalpy driven in all the studied diluents and that extraction is more exothermic in alkane diluents. Analysis of the stoichiometry of the extracted complexes shows that the average ligand number of TODGA molecules in the extracted complex is lower for Am compared to Eu except for with alkane diluents.

摘要

研究了溶解于不同分子稀释剂中的二（2-乙基己基）二甘醇酰胺（TODGA）对铕和镅的溶剂萃取。本工作中使用的稀释剂类型为伯醇和仲醇、仲酮和烷烃。测定了萃取剂浓度、温度、稀释剂类型及其碳链长度对萃取的影响。铕和镅的分配比高度依赖于稀释剂类型以及同一类型稀释剂中的碳链长度。在烷烃稀释剂中观察到铕和镅的最高分配比以及铕相对于镅的分离因子。在链中含有5个碳原子的极性稀释剂中观察到铕和镅意外的高分配比，明显与一般趋势不同。研究发现，在所有研究的稀释剂中，TODGA对铕和镅的萃取是由焓驱动的，并且在烷烃稀释剂中萃取的放热性更强。对萃取配合物化学计量学的分析表明，除了烷烃稀释剂外，萃取配合物中镅的TODGA分子平均配位数低于铕。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/5156634d2c93/d1ra07534a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/d8f93d8118ee/d1ra07534a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/b97feef0c1a0/d1ra07534a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/44a4e1c2f7cd/d1ra07534a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/5156634d2c93/d1ra07534a-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/d8f93d8118ee/d1ra07534a-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/b97feef0c1a0/d1ra07534a-f2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/44a4e1c2f7cd/d1ra07534a-f3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7847/9043636/5156634d2c93/d1ra07534a-f4.jpg

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