Liquid–Liquid Extraction of Actinides from Nitric Acid Feeds Using Two Hexa-n-alkylnitrilotriacetamides

IF 1.8 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Solvent Extraction and Ion Exchange Pub Date : 2021-07-07 DOI:10.1080/07366299.2021.1946999

Ananda Karak, B. Mahanty, P. Mohapatra, R. Egberink, T. Valsala, D. Sathe, R. Bhatt, J. Huskens, W. Verboom

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引用次数: 6

Abstract

ABSTRACT Solutions of two nitrilotriacetamide (NTA) ligands, viz., N,N,N’,N’,N”,N”-hexa-n-butylnitrilotriacetamide (HBNTA) and N,N,N’,N’,N”,N”-hexa-n-hexylnitrilotriacetamide (HHNTA) in 20% isodecanol–80% n-dodecane were employed for the extraction of U(VI), Np(IV), Pu(IV), and Am(III) from nitric acid feed solutions. Limitations of ligand solubility and third-phase formation when contacted with nitric acid solutions led to the choice of the diluent composition of 20% isodecanol and 80% n-dodecane. The results of the solvent extraction studies indicated poor extraction of the metal ions with HBNTA as compared to that with HHNTA as the extractant and hence, major part of this work involved HHNTA. Slope analysis suggested extraction of 1:1 (ML) species with Np(IV) and Pu(IV) at 3 M HNO3 and mixed 1:2 (ML2) and 1:3 (ML3) species with U(VI) at pH 2. At 0.5 M HNO3, the observed trend for extraction was Pu(IV) > Np(IV) >> Am(III) > U(VI).

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两种六正烷基硝基三乙酰酰胺液液萃取硝酸原料中的锕系元素

摘要：采用两种氮基三乙酰胺（NTA）配体，即N，N，N'，N'，N“，N”-六正丁基氮基三甲酰胺（HBNTA）和N，N’，N’”，N“-六正己基氮基三酰胺（HHNTA）在20%异癸醇–80%正十二烷中的溶液，从硝酸进料溶液中提取U（VI）、Np（IV）、Pu（IV）和Am（III）。当与硝酸溶液接触时，配体溶解度和第三相形成的限制导致选择20%异癸醇和80%正十二烷的稀释剂组成。溶剂萃取研究的结果表明，与使用HHNTA作为萃取剂相比，使用HBNTA对金属离子的萃取较差，因此，这项工作的主要部分涉及HHNTA。斜率分析表明，在3M HNO3下用Np（IV）和Pu（IV）提取1:1（ML）物种，并在pH 2下用U（VI）混合1:2（ML2）和1:3（ML3）物种。在0.5M HNO3下，观察到的提取趋势为Pu（IV）>Np（IV）>>Am（III）>U（VI）。

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来源期刊

Solvent Extraction and Ion Exchange 化学-化学综合

CiteScore

4.40

自引率

5.00%

发文量

审稿时长

8.4 months

期刊介绍： Solvent Extraction and Ion Exchange is an international journal that publishes original research papers, reviews, and notes that address all aspects of solvent extraction, ion exchange, and closely related methods involving, for example, liquid membranes, extraction chromatography, supercritical fluids, ionic liquids, microfluidics, and adsorption. We welcome submissions that look at: The underlying principles in solvent extraction and ion exchange; Solvent extraction and ion exchange process development; New materials or reagents, their syntheses and properties; Computational methods of molecular design and simulation; Advances in equipment, fluid dynamics, and engineering; Interfacial phenomena, kinetics, and coalescence; Spectroscopic and diffraction analysis of structure and dynamics; Host-guest chemistry, ion receptors, and molecular recognition.