Sequestration of tetravalent neptunium from acidic feeds using diglycolamide-functionalized dendrimers in a room temperature ionic liquid: extraction, spectroscopic and electrochemical studies,New Journal of Chemistry

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Sequestration of tetravalent neptunium from acidic feeds using diglycolamide-functionalized dendrimers in a room temperature ionic liquid: extraction, spectroscopic and electrochemical studies
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-08-23 , DOI: 10.1039/d1nj03098a
Parveen K. Verma ₁ , Rajesh B. Gujar ₁ , Bholanath Mahanty ₁ , Andrea Leoncini ₂ , Jurriaan Huskens ₂ , Willem Verboom ₂ , Prasanta K. Mohapatra ₁

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Quantitative extraction of Np(IV) was achieved using a room temperature ionic liquid containing sub-millimolar concentrations of two poly(propyleneimine) based dendrimer ligands with four (L_I) and eight (L_II) diglycolamide (DGA) moieties from nitric acid solutions. The extraction of the metal ion followed a cation exchange mechanism with decreasing extraction with increasing HNO₃ concentration up to 4 M, the major exchanging species being Np(NO₃)₃L⁺. Beyond this acidity an increased metal ion extraction was seen, which was attributed to an anion exchange mechanism. UV-visible spectrophotometric studies showed a different nature of the extracted Np-L (L_I or L_II) complexes in the ionic liquid and molecular diluent. Quantitative back extraction of Np(IV) was achieved by using aqueous complexing agents. Cyclic voltametric studies of the extracted complexes exhibited differences in the electron-donating ability of the two ligands towards Np(IV). Both ligands showed a non-reversibility or a quasi-reversible nature of the Np reduction couple. The radiation stability of the present extraction system was not so high.

中文翻译：

在室温离子液体中使用二甘醇酰胺官能化树枝状聚合物从酸性原料中螯合四价镎：萃取、光谱和电化学研究

Np( IV ) 的定量提取是使用室温离子液体实现的，该离子液体含有亚毫摩尔浓度的两种基于聚（丙烯亚胺）的树枝状大分子配体，以及来自硝酸溶液的四个 ( L _I ) 和八个 ( L _II ) 二甘醇酰胺 (DGA) 部分. 金属离子的提取遵循阳离子交换机制，随着 HNO ₃浓度增加至 4 M，提取量减少，主要交换物质是 Np(NO ₃ ) ₃ L ⁺. 超过这种酸度，金属离子提取增加，这归因于阴离子交换机制。紫外-可见分光光度法研究表明，离子液体和分子稀释剂中提取的 Np-L（L _I或L _II）复合物具有不同的性质。Np( IV ) 的定量反萃取是通过使用水性络合剂实现的。提取的复合物的循环伏安研究显示两种配体对 Np( IV )的电子供体能力存在差异。两种配体都显示出 Np 还原对的不可逆性或准可逆性。本提取系统的辐射稳定性不是那么高。

更新日期：2021-09-10

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