CeRES Process−Separation of Cerium from Lanthanum by Redox Extraction and Stripping: ACS Sustainable Chemistry & Engineering
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Effective methods for rare earth separation remain an important challenge that could benefit from new approaches. In this study, we demonstrate that for La/Ce separation, an in situ electrochemical Redox process in combination with Extraction and Stripping would provide very efficient separation of these elements in a single extraction step (CeRES). By combining in situ electrochemical oxidation and simultaneous solvent extraction with a stripping process involving electrochemical reduction, separation of Ce 3+from La 3+is achieved. Here, Ce 3+is electrochemically oxidized to Ce 4+and removed from the aqueous phase by solvent extraction with 100 mM D2EHPA in n-octane. To recover Ce 4+from the loaded organic phase, in situ electrochemical reduction of Ce 4+to Ce 3+is employed. Thus, extraction and stripping by the redox state change triggered only by electrochemistry are achieved for the first time by using a shared organic phase. The approach was verified in a rapid prototype cell using the additive manufacturing technique, which enables a high Ce extraction of 85% and its recovery with nearly 100% purity in a single extraction step without the use of additional reagents.
Details
Original language | English |
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Pages (from-to) | 16290-16298 |
Number of pages | 9 |
Journal | ACS sustainable chemistry & engineering |
Volume | 10 |
Issue number | 49 |
Publication status | Published - 2022 |
Peer-reviewed | Yes |
External IDs
Scopus | 85142620497 |
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ORCID | /0000-0001-7323-7816/work/142257481 |
Keywords
Research priority areas of TU Dresden
DFG Classification of Subject Areas according to Review Boards
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- additive manufacturing, electrolysis, electrosynthesis, rare earth elements, solvent extraction