Separation of uranium(VI) and americium(III) by Extraction from Na2CO3-H2O2 solutions using methyltrioctylammonium carbonate in toluene

被引：4

作者：

Boyarintsev, Alexander Valentinovich ^{[1
]}

Kostikova, Galina Valerievna ^{[2
]}

Stepanov, Sergey Illarionovich ^{[1
,2
]}

Chekmarev, Alexander Mihailovich ^{[1
,2
]}

Tsivadze, Aslan Yusupovich ^{[2
]}

机构：

[1] Mendeleev Univ Chem Technol, Moscow, Russia

[2] Russian Acad Sci, AN Frumkin Inst Phys Chem & Electrochem, Moscow, Russia

来源：

SOLVENT EXTRACTION AND ION EXCHANGE | 2021年 / 39卷 / 07期

关键词：

Uranium(VI) carbonate and peroxo-carbonate complexes; americium(III) carbonate complexes; sodium carbonate; hydrogen peroxide; liquid-liquid extraction; quaternary ammonium compounds; methyltrioctylammonium carbonate; toluene; CARBEX PROCESS IDENTIFICATION; ELECTRONIC-SPECTRA; ABSORPTION-BANDS; U(VI); CHEMISTRY; LIGANDS;

D O I：

10.1080/07366299.2021.1876993

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Liquid-liquid extraction of carbonate and mixed peroxo-carbonate compounds of U(VI) and Am(III) from Na2CO3 aqueous solutions by methyltrioctylammonium carbonate in toluene has been studied. The main patterns of effect of extractant, Na2CO3, and H2O2 concentration on distribution and separation of U(VI) and Am(III) have been established. Using slope analysis and UV-vis spectroscopy, the compositions of U(VI) and Am(III) extractable compounds are established as (R4N)(4)[UO2(CO3)(3)], (R4N)(4)[UO2(O-2)(CO3)(2)], and (R4N)(6)[(UO2)(2)(O-2)(CO3)(4)] for U(VI); R4N[Am(CO3)(2)] and (R4N)(3)[Am(CO3)(3)] for Am(III), where R4N is the quaternary ammonium cation. The obtained data showed high efficiency of the studied carbonate system for extraction of U(VI) and its purification from Am(III). The maximum separation factor of U(VI) and Am(III) was 25.

引用

页码：745 / 763

页数：19

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