Impact Factor 2023: 10.7
Impact Factor 2023: 10.7
| Citation: | Li Cui, Lijuan Wang, Ming Feng, Li Fang, Yanxia Guo, Fangqin Cheng. Ion-pair induced solvent extraction of lithium (I) from acidic chloride solutions with tributyl phosphate. Green Energy&Environment, 2021, 6(4): 607-616. doi: 10.1016/j.gee.2020.05.002
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Lithium (Li) is an important energy metal in the 21st century. However, the selective recovery of Li is still a big challenge, especially from acidic solutions with multiple metal ions existence. Herein we report a new ion pair induced mechanism for selectively extracting Li+ from acidic chloride solutions by tributyl phosphate (TBP). It is shown that the acidity and the chloride ions in the aqueous phase have great effects on the extraction of Li+. The FT-IR, UV-Vis and ESI-MS experiments provide solid evidence for the formation of ion-pair complex [Li(TBP)n(H2O)m]+[FeCl4]- (n = 1, 2, 3; m = 0, 1) in the organic phase, which brings about the effective and efficient extraction of Li+. This mechanism can overcome the Hofmeister bias and allow for the selective extraction of Li+ from the extremely hydrophilic chlorides. It has also been proved that the loaded Li in TBP can be effectively stripped by concentrated HCl solution with a Li/Fe separation factor > 500. The understanding of the ion-pair transport mechanism is helpful for optimizing the recovery process or further advancing more efficient recovery techniques for Li from acidic liquor.
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