Mechanisms of ionic liquids on the enhancement of interfacial transport of lithium ions in crown ether system

The enrichment of 7Li by extraction with a Sudan I-Ionic liquid system

“…A lower concentration of extractant can increase the selectivity for specific substances, while a higher concentration of extractant leads to a lower separation effect, i.e., the co-extraction effect. 41 The results indicate that within a certain range, the elevated concentration of Sudan I is favorable for the lithium isotope separation effect.…”

“…38 Ionic liquids play a supporting role in the cross-interface migration of Li + , and the stronger the anionic hydrophilicity, the stronger the complementary Li + extraction. [39][40][41] As a result, more Li + will enter the organic phase and bind to Sudan, resulting in three ionic liquid anions exhibiting different extraction and separation properties.…”

The extraction method for the separation of lithium isotopes using B12C4/B15C5/B18C6-ionic liquid systems

“…Nishizawa et al 19,20 obtained a separation factor of 1.044 by the extraction method with the H 2 O/CHCl 3 /benzo-15-crown-5 system, and the separation factor was higher than that of other substituted 15-crown-5 systems. Cui et al 21 obtained separation factors of 1.038 and 1.049 for benzo-15-crown-5 and benzo-12-crown-4 respectively in dichloroethane through a novel ion-pair extraction strategy at 273 K. Our team investigated more benzo-15crown-5 derivatives in the extraction system, such as 4 0 -acetylbenzo-15-crown-5, 22 4-nitrobenzo-15-crown-5, 23 4-aminobenzo-15-crown-5 24 and 4-bromobenzo-15-crown-5 25 and the maximum separation factor reached 1.056.…”

Synthesis of a magnetic crown ether ion imprinted polymer material for the selective adsorption of lithium

“…27,28 Crown ethers are cyclic compounds made of bonded ether. 29,30 They can react with metal ions through dipole-charge electrostatic interaction to form stable complexes, which are often used to selectively extract metal ions. Cheng et al grafted 2-(hydroxymethyl)-12-crown-4-ether onto the surface of chitosan using a low-temperature phase separation approach to obtain a crown ether-modified chitosan nanofiber membrane, which demonstrated high selectivity for Li + with separation factors of 1.40, 34.05, 1.33 and 3.46 for Ca 2+ , K + , Mg 2+ and Na + , respectively.…”