Liquid–Liquid Extraction and Supported Liquid Membrane Transport of Neptunium(IV) Across a Flat-Sheet Supported Liquid Membrane Containing a TREN-DGA Derivative

IF 1.8 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Solvent Extraction and Ion Exchange Pub Date : 2022-05-29 DOI:10.1080/07366299.2022.2074501

B. Mahanty, P. Mohapatra, A. Leoncini, J. Huskens, W. Verboom

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引用次数: 3

Abstract

ABSTRACT Liquid–liquid extraction and liquid membrane transport behavior of tetravalent actinide ions viz. Th(IV), Np(IV), and Pu(IV) were investigated for the first time using a diglycolamide (DGA) based dendrimer with a tris(2-aminoethyl)amine (TREN) scaffold as the organic extractant. The generation of 1 dendrimer with six DGA pendent moieties (termed as TREN-G1-DenDGA) extracted Np(IV) more effectively than the other two ions, the trend being Np(IV) > Pu(IV) > Th(IV). The extraction studies of Np(IV) from 3 M HNO3 indicated a 1:1 (metal:ligand) species and the extraction efficiency increased with increasing nitric acid concentration (1–6 M). The transport efficiency of Np(IV) increased with the nitric acid concentration (1–6 M) as well as with the ligand concentration. A very low concentration of 5.75 × 10−4 M ligand, when used as the carrier, resulted in the transport of ca. 25% metal ion transport in 5 h, which increased to >85% with 4.4 × 10−3 M ligand. The transport efficiency of the metal ion across the SLM followed the trend Np(IV) > Th(IV) > Pu(IV). The membrane stability was not satisfactory as seen over a period of 5 days suggesting long-term use may require regular replenishment of the carrier solvent. The effective diffusion coefficient (D eff) of Np(IV)-TREN-G1-DenDGA were determined by the lag-time method and was found to be 5.1 × 10−8 cm2/s.

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含trenn - dga衍生物的平板支撑液膜上镎的液-液萃取和支撑液膜运输(IV

首次以二甘醇酰胺(DGA)为基、三(2-氨基乙基)胺(TREN)支架为有机萃取剂，研究了四价锕系离子Th(IV)、Np(IV)和Pu(IV)的液液萃取和液膜迁移行为。生成具有6个DGA悬垂基团的1型树状大分子(称为tren1 - g1 - dendga)对Np(IV)的提取效果优于其他两种离子，呈现Np(IV) > Pu(IV) > Th(IV)的趋势。从3 M HNO3中提取Np(IV)的研究表明，Np(IV)呈1:1(金属:配体)形态，萃取效率随硝酸浓度(1 ~ 6 M)的增加而增加，Np(IV)的转运效率随硝酸浓度(1 ~ 6 M)和配体浓度的增加而增加。以极低浓度的5.75 × 10−4 M配体作为载体时，5 h内金属离子的输运率约为25%，当配体浓度为4.4 × 10−3 M时，金属离子的输运率增加到85%。金属离子在SLM上的输运效率表现为Np(IV) > Th(IV) > Pu(IV)。在5天的时间里，膜的稳定性并不令人满意，这表明长期使用可能需要定期补充载体溶剂。通过滞后时间法测定了Np(IV)- trenn - g1 - dendga的有效扩散系数(deff)为5.1 × 10−8 cm2/s。

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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.