Separation of Cobalt and Nickel with 2-Ethylhexyl Phosphonic Acid Mono-2-Ethylhexyl Ester Using a Countercurrent Mixer-Settler Cascade

Watari, Teppei; Takase, Daiki; Nishihama, Syouhei; Yoshizuka, Kazuharu

doi:10.15261/serdj.24.131

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Recently, we conducted single-stage extraction with Et-Tol-DAPhen as the extractant and observed its stronger affinity for actinides over Eu(III). − Cascade countercurrent extraction is a realistic operation that can simulate the operation of the multistage mixer-settler in the reprocessing process of SNF. , The cascade countercurrent extraction employs centrifuge tubes, pipettes, oscillators, and centrifuges as the operating equipment, which can complete the operation steps, including pipetting, oscillating mixing, centrifuging, and dividing, to simulate the operation of the mixing and clarification process . The principle of the cascade countercurrent extraction is the same as that the real industrial application process.…”

Section: Introductionmentioning

confidence: 99%

Strong Periodic Tendency of Trivalent Lanthanides Coordinated with a Phenanthroline-Based Ligand: Cascade Countercurrent Extraction, Spectroscopy, and Crystallography

et al. 2021

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Phenanthroline-diamide ligands have been reported in the selective separation of actinides over Eu(III); on the contrary, relevant basic coordination chemistry studies are still limited, and extraction under actual application conditions is rarely involved. In this work, N,N′-diethyl-N,N′-ditolyl-2,9-diamide-1,10-phenanthroline [Et-Tol-DAPhen (L)] was applied to explore the coordination performance of lanthanides in simulative high-level liquid waste. For the first time, cascade countercurrent extraction was conducted with Et-Tol-DAPhen as the extractant, which reveals the periodic tendency of the extraction efficiency of lanthanides to decrease gradually as the atomic number increases. Comparison of elements with similar radii verifies the hypothesis that the increase in the atomic number leads to a decrease in the ionic radius, thus reducing the coordination and extraction capacity of ligands. Slope analysis, electrospray ionization mass spectrometry, and ultraviolet−visible titration results show that the ligand forms 1:1 and 1:2 complexes with lanthanides and the coordination ability follows the tendency of extraction efficiency, and the first crystal structures of Lns(III) with a phenanthroline-diamide ligand, i.e., [LaL(NO 3 ) 3 (H 2 O)] and [LaL 2 (NO 3 ) 2 ][(NO 3 )], were obtained, which confirms the conclusions described above. This work promises to enhance our comprehension of the chemical properties of Lns(III) and offer new clues for the design and synthesis of novel separation ligands.

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