Efficient and Sustainable Regeneration of Bifunctional Ionic Liquid for Rare Earth Separation

Huang, Chao; Huang, Bin; Dong, Yamin; Chen, Jinqing; Wang, Yanliang; Sun, Xiaoqi

doi:10.1021/acssuschemeng.7b00159

Cited by 42 publications

(19 citation statements)

References 28 publications

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“…[ 24 ] first demonstrated RTIL as media for clean liquid–liquid extraction was feasible, which avoided the use of volatile organic compounds (VOCs). Followed by Rogers's work, ILs were widely used in metal ions separation, such as rare earth elements, [ 25‐27 ] Sr 2+ , [ 28‐30 ] UO 2+ . [ 31 ] Shi et al .…”

Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids

et al. 2020

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of main observation and conclusion The extraction of Li + from the high Mg/Li ratio brine was performed using hydroxyl functional ionic liquids (ILs) as the coextractant and tributyl phosphate (TBP) as the extractant. Firstly, the extractive system, 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HOEmim][NTf2]) + TBP was proved to exhibit the highest extraction efficiency of Li + (88.15%) from LiCl aqueous solutions among the extractants composed of different ILs, TBP, and ILs + TBP. Effects of various extraction parameters on the extraction efficiencies of Li + and Mg 2+ were then investigated. 95.01% of Li + was extracted and the Li/Mg separation factor reached 405.76 in a single-stage at 278.15 K and O/A of 2 : 1. The extraction complexes were determined by the slope analysis method and ESI-MS analysis, and the metal complexes in the organic phase were indicated to be mainly [Li•2 TBP][NTf2]. The striping study showed that 92.86% of Li + was stripped with 1.0 mol•L-1 HCl. 98% extraction capacity of the synergy extractants was remained after 5 regeneration cycles. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°), together with the mechanism of the Li + extraction were further demonstrated finally. According to the results, [HOEmim][NTf2] + TBP extraction system showed promising performance in extracting lithium from salt lake brine with high Mg/Li ratio.

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Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids

et al. 2020

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“…Ionic liquids (ILs) have gained considerable attention for metal ions separation in solvent extraction system owning to their superior characteristics such as low vapor pressure, nonflammable properties, and tunable structures . As an extracting agent, ILs can be manipulated through design of the cation and anions to improve the extraction efficiency and the selectivity of metal ions of interest . The hydrophobic character and negligible vapor pressure of certain ILs allow their use as solvents to replace traditional volatile molecular solvents .…”

Section: Introductionmentioning

confidence: 99%

Role of ionic liquids in the efficient transfer of lithium by Cyanex 923 in solvent extraction system

et al. 2019

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The solvent extraction of Li + by Cyanex 923 was investigated upon the addition of different imidazolium-based ionic liquids (ILs). The results showed 1-hydroxylethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HOEmim][NTf 2 ]) can improve the extraction of Li + most effectively. The fundamental mechanism is that [HOEmim] [NTf 2 ] can remarkably enhance the coordination ability of Cyanex 923 to Li + to form more stable and hydrophobic ion-pair species [Li(Cyanex 923) n ][NTf 2 ] (n max = 3) resulting from the electrostatic interaction and typical hydrogen bonding of IL, and thus facilitating the transfer of Li + into organic phase. This work has revealed the transfer mechanism of Li + in a solvent extraction system comprising of IL and neural ligand. The knowledge of the coordination environment of Li + in the presence of IL also gives us a new insight into the separation of 6 Li/ 7 Li. The disadvantage of this process is the loss of IL. However, this study provides guidance for the design of better IL-based systems for the separation of metal ions. K E Y W O R D S extraction, ionic liquids, lithium, trialkylphosphine oxide 1 | INTRODUCTION Lithium (Li) is a strategic metal. It has a wide variety of applications in the area of nuclear energy, 1 aeronautics and astronautics, lithium batteries, 2 glasses, and ceramics. With the growing market in electronics and new

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“…ILs also act as either an inner diluent or an active extractant in the extraction systems, because their unique ion-exchange capability can offer an ideal solvation environment for extraction/separation of ionic metal species [23]. However, it should be stressed that ILbased extraction systems do not only have advantages, they also have some limitations [24]. The cations or anions of ILs can be transferred into the aqueous phase during the extraction operation when an extraction reaction occurs through the ion-exchange mechanism [25].…”

Section: Unique Properties Of Ilsmentioning

confidence: 99%

Application of Ionic Liquids in Solvent Extraction of Platinum Group Metals

Firmansyah

Yoshida

Hanada

et al. 2020

SERDJ

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The advantageous properties of ionic liquids (ILs) have put them in the spotlight in recent years as durable and environmentally friendly solvents compared with conventional organic solvents. The applications of ILs have been expanding in various fields, including extraction and separation of metals. Platinum group metals (PGMs) are attractive targets for recovery using IL systems. In recent years, ILs have shown excellent performance for PGM extraction. In this review, we focus on the recent progress in solvent extraction using ILs for PGM recovery. Although application of ILs in PGM recovery is still in the early stages, research and development of ILs in this area are steadily advancing owing to the unique properties of ILs, such as their non-volatility, inflammability, low toxicity, and tunability. Fundamental approaches are expected to realize industrial applications of ILs in the future.

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Efficient and Sustainable Regeneration of Bifunctional Ionic Liquid for Rare Earth Separation

Cited by 42 publications

References 28 publications

Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids

Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids

Role of ionic liquids in the efficient transfer of lithium by Cyanex 923 in solvent extraction system

Application of Ionic Liquids in Solvent Extraction of Platinum Group Metals

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