【摘 要】
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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 wit
【机 构】
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Institute of Resources and Environment Engineering,State Environmental Protection Key Laboratory of
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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]+[FeC14]-(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 HC1 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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