Abstract
A novel liquid–liquid extraction system was investigated for the selective separation of lithium isotopes using ionic liquids (ILs=[C6,8,10,12mim]+[PF6]－) as extraction solvent and benzo-15-crown-5 (B15C5) as extractant. The effects of the concentration of lithium salt, counter anion of lithium salt, initial pH of aqueous phase, and extraction temperature on the lithium isotopes separation were studied. The maximum single-stage separation factor α of 6Li/7Li obtained in the present study was 1.038 ± 0.002, indicating the lighter isotope 6Li was enriched in organic phase while the heavier isotope 7Li was concentrated in the aqueous phase. The formation of 2:1 complex Li(B15C5)2+ in the IL phase was determined on the basis of slope analysis method. The large value of the free energy change (−G0=77.87 J mol−1) indicated the high separation capability of the lithium isotopes by B15C5/30%CH3Cl-70% C6mimPF6 mixture extraction system. Lithium in Li(B15C5)2+ complex was stripped by 0.5mol·L−1 HCl solution. The extraction system offers high efficiency, simplicity application prospect to separation lithium isotope separation from LiCl solution.
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