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Allosteric extraction of a second gallium anion assisted by the first, loaded onto a fluorinated secondary amide reagent. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119036] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Selective Extraction of Platinum(IV) from the Simulated Secondary Resources Using Simple Secondary Amide and Urea Extractants. SEPARATIONS 2021. [DOI: 10.3390/separations8090139] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The recycling of rare metals such as platinum (Pt) from secondary resources, such as waste electronic and electrical equipment and automotive catalysts, is an urgent global issue. In this study, simple secondary amides and urea, N-(2-ethylhexyl)acetamide, N-(2-ethylhexyl)octanamide, and 1-butyl-3-(2-ethylhexyl)urea, which selectively extract Pt(IV) from a simulated effluent containing numerous metal ions, such as in an actual hydrometallurgical process, were synthesized and achieved efficient Pt(IV) stripping using only water. Comparison of Pt(IV) extraction behavior with a tertiary amide without N–H moieties suggests that the secondary amides and urea extractants effectively use hydrogen bonding to the hexachloroplatinate anion by N–H moieties. Examining the conditions for the third phase formation revealed that the secondary amide extractant with the longest alkyl chain can be used in the extraction process for a long time without forming any third phase, despite its lower Pt(IV) extraction capacity. The practical trial with simple compounds developed in this study should contribute to the development of Pt separation and purification processes.
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Ohto K, Furugou H, Morisada S, Kawakita H, Isono KI, Inoue K. Stepwise Recovery of Molybdenum, Vanadium, and Tungsten with Amino-Type “Trident” Molecule by Stripping. SOLVENT EXTRACTION AND ION EXCHANGE 2021. [DOI: 10.1080/07366299.2021.1876370] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Keisuke Ohto
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
| | - Hiroaki Furugou
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
| | - Shintaro Morisada
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
| | - Hidetaka Kawakita
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
| | - Ken-ichi Isono
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
| | - Katsutoshi Inoue
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
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