Functionalized Dipicolinic Acid Derivatives as TALSPEAK-MME Stripping Agents.
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| Title: | Functionalized Dipicolinic Acid Derivatives as TALSPEAK-MME Stripping Agents. |
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| Authors: | Uhnak, Nicolas E. F.1,2 (AUTHOR), Nash, Kenneth L.1 (AUTHOR) knash@wsu.edu |
| Source: | Solvent Extraction & Ion Exchange. 2021, Vol. 39 Issue 1, p18-37. 20p. |
| Subjects: | Acid derivatives, Buffer solutions, pH effect, Analytical mechanics, Rare earth metals, Americium, Solvent extraction, Transition metals |
| Abstract: | This work describes the results of an assessment of two derivatives of dipicolinic acid (DPA) as the actinide-selective stripping reagents in the combined HEH[EHP]/Cyanex-923 system, TALSPEAK-MME (mixed monofunctional extractants). One purpose of this investigation is to demonstrate probable advantages derived in phase-transfer kinetics by deploying dipicolinates as preorganized aminopolycarboxylate complexants in TALSPEAK-derived separation systems. The investigation is focused on the behavior of the lanthanides, Am, and selected transition metals (Zr, Mo, Pd, Ru, and Rh) in the extraction, solvent conditioning, and stripping steps. Solvent conditioning with glycine buffer solutions is shown to be effective for the removal of entrained HNO3 while also managing Pd concentration prior to actinide stripping. The efficacy of the DPA derivative during the actinide-selective strip was assessed, focusing explicitly on the effects of pH and ligand concentration and evaluating the stripping kinetics. These ligands were shown to be highly selective for americium, producing in the TALSPEAK-MME platform separation factors comparable to commonly used actinide selective stripping agents for radiotracer Eu, Am, a trans-lanthanide series and selected transition metals. The stripping kinetics study revealed very rapid phase-transfer reactions, reaching equilibrium in less than 10 s on vigorous agitation. Further work will be required to address the possible contamination of the product by selected transition metals (such as Zr) during the stripping step. [ABSTRACT FROM AUTHOR] |
| Copyright of Solvent Extraction & Ion Exchange is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 147339092 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Functionalized Dipicolinic Acid Derivatives as TALSPEAK-MME Stripping Agents. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Uhnak%2C+Nicolas+E%2E+F%2E%22">Uhnak, Nicolas E. F.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nash%2C+Kenneth+L%2E%22">Nash, Kenneth L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> knash@wsu.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Solvent+Extraction+%26+Ion+Exchange%22">Solvent Extraction & Ion Exchange</searchLink>. 2021, Vol. 39 Issue 1, p18-37. 20p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Acid+derivatives%22">Acid derivatives</searchLink><br /><searchLink fieldCode="DE" term="%22Buffer+solutions%22">Buffer solutions</searchLink><br /><searchLink fieldCode="DE" term="%22pH+effect%22">pH effect</searchLink><br /><searchLink fieldCode="DE" term="%22Analytical+mechanics%22">Analytical mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Americium%22">Americium</searchLink><br /><searchLink fieldCode="DE" term="%22Solvent+extraction%22">Solvent extraction</searchLink><br /><searchLink fieldCode="DE" term="%22Transition+metals%22">Transition metals</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This work describes the results of an assessment of two derivatives of dipicolinic acid (DPA) as the actinide-selective stripping reagents in the combined HEH[EHP]/Cyanex-923 system, TALSPEAK-MME (mixed monofunctional extractants). One purpose of this investigation is to demonstrate probable advantages derived in phase-transfer kinetics by deploying dipicolinates as preorganized aminopolycarboxylate complexants in TALSPEAK-derived separation systems. The investigation is focused on the behavior of the lanthanides, Am, and selected transition metals (Zr, Mo, Pd, Ru, and Rh) in the extraction, solvent conditioning, and stripping steps. Solvent conditioning with glycine buffer solutions is shown to be effective for the removal of entrained HNO3 while also managing Pd concentration prior to actinide stripping. The efficacy of the DPA derivative during the actinide-selective strip was assessed, focusing explicitly on the effects of pH and ligand concentration and evaluating the stripping kinetics. These ligands were shown to be highly selective for americium, producing in the TALSPEAK-MME platform separation factors comparable to commonly used actinide selective stripping agents for radiotracer Eu, Am, a trans-lanthanide series and selected transition metals. The stripping kinetics study revealed very rapid phase-transfer reactions, reaching equilibrium in less than 10 s on vigorous agitation. Further work will be required to address the possible contamination of the product by selected transition metals (such as Zr) during the stripping step. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Solvent Extraction & Ion Exchange is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/07366299.2020.1815391 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 20 StartPage: 18 Subjects: – SubjectFull: Acid derivatives Type: general – SubjectFull: Buffer solutions Type: general – SubjectFull: pH effect Type: general – SubjectFull: Analytical mechanics Type: general – SubjectFull: Rare earth metals Type: general – SubjectFull: Americium Type: general – SubjectFull: Solvent extraction Type: general – SubjectFull: Transition metals Type: general Titles: – TitleFull: Functionalized Dipicolinic Acid Derivatives as TALSPEAK-MME Stripping Agents. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Uhnak, Nicolas E. F. – PersonEntity: Name: NameFull: Nash, Kenneth L. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: 2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 07366299 Numbering: – Type: volume Value: 39 – Type: issue Value: 1 Titles: – TitleFull: Solvent Extraction & Ion Exchange Type: main |
| ResultId | 1 |
