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Study on the extraction of lanthanides by isomeric diglycolamide extractants: an experimental and theoretical study.

ABSTRACT: Two isomeric diglycolamide (DGA) extractants, N,N'-dimethyl-N,N'-dioctyl diglycolamide (L^I) and N,N-dimethyl-N',N'-dioctyl diglycolamide (L^II), were used to perform a comparative study on the extraction performances towards several lanthanides by extraction experiments and theoretical calculations. The experimental results show that both L^I and L^II show a positive sequence on the extraction of lanthanides, and L^I exhibits the higher complex ability with these lanthanides than L^II, except for La and Ce. Slope analysis shows that 1:2 or 1:3 complexes are formed between the two ligands and the metal ions. The geometrical structures of the complexes were optimized in the gas phase by density functional theory (DFT) on the basis of complex compositions. The results of bond lengths, MBOs and topological analysis indicated that the electrostatic interaction between metal ions and two amide O atoms in the L^II ligand is not as homogeneous as in L^I, and this inhomogeneity is likely to be related to the poor extraction performance of L^II.

SUBMITTER: Liu Y

PROVIDER: S-EPMC8978646 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature

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Study on the extraction of lanthanides by isomeric diglycolamide extractants: an experimental and theoretical study.

Liu Yaoyang Y Zhao Chuang C Liu Zhibin Z Liu Sheng S Zhou Yu Y Jiao Caishan C Zhang Meng M Gao Yang Y He Hui H Zhang Shaowen S

RSC advances 20211224 2

Two isomeric diglycolamide (DGA) extractants, N,N'-dimethyl-N,N'-dioctyl diglycolamide (LI) and N,N-dimethyl-N',N'-dioctyl diglycolamide (LII), were used to perform a comparative study on the extraction performances towards several lanthanides by extraction experiments and theoretical calculations. The experimental results show that both LI and LII show a positive sequence on the extraction of lan ...[more]

PMID: 35425104

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Project description:Rare earth elements (REEs) and their compounds are essential for rapidly developing modern technologies. These materials are especially critical in the area of green/sustainable energy; however, only very high-purity fractions are appropriate for these applications. Yet, achieving efficient REE separation and purification in an economically and environmentally effective way remains a challenge. Moreover, current extraction technologies often generate large amounts of undesirable wastes. In that perspective, the development of selective, reusable, and extremely efficient sorbents is needed. Among numerous ligands used in the liquid-liquid extraction (LLE) process, the diglycolamide-based (DGA) ligands play a leading role. Although these ligands display notable extraction performance in the liquid phase, their extractive chemistry is not widely studied when such ligands are tethered to a solid support. A detailed understanding of the relationship between chemical structure and function (i.e., extraction selectivity) at the molecular level is still missing although it is a key factor for the development of advanced sorbents with tailored selectivity. Herein, a series of functionalized mesoporous silica (KIT-6) solid phases were investigated as sorbents for the selective extraction of REEs. To better understand the extraction behavior of these sorbents, different spectroscopic techniques (solid-state NMR, X-ray photoelectron spectroscopy, XPS, and Fourier transform infrared spectroscopy, FT-IR) were implemented. The obtained spectroscopic results provide useful insights into the chemical environment and reactivity of the chelating ligand anchored on the KIT-6 support. Furthermore, it can be suggested that depending on the extracted metal and/or structure of the ligand and its attachment to KIT-6, different functional groups (i.e., C═O, N-H, or silanols) act as the main adsorption centers and preferentially capture targeted elements, which in turn may be associated with the different selectivity of the synthesized sorbents. Thus, by determining how metals interact with different supports, we aim to better understand the solid-phase extraction process of hybrid (organo)silica sorbents and design better extraction materials.

Dataset Information

Study on the extraction of lanthanides by isomeric diglycolamide extractants: an experimental and theoretical study.

Publications

Study on the extraction of lanthanides by isomeric diglycolamide extractants: an experimental and theoretical study.

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