A green strategy for lithium isotopes separation by using mesoporous silica materials doped with ionic liquids and benzo-15-crown-5

Zhou, Wen; Sun, Xiaoli; Gu, Lin; Bao, Fei-Fei; Xu, Xinxin; Pang, Chun-Yan; Gu, Zhi‐Guo; Li, Zaijun

doi:10.1007/s10967-014-3052-y

Cited by 42 publications

(22 citation statements)

References 47 publications

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“…This may be due to the change of the Li + coordination environment in the presence of different amount of [HOEmim][NTF 2 ]. It was evidenced that the coordination of metals with ligands can be transformed when hydrophobic ILs are used to replace the conventional solvents in the solvent extraction system . We noted that the absorption of P=O for extracted Li species and the vibration mode for [HOEmim][NTF 2 ] at 1,139 cm −1 overlapped.…”

Section: Ir Analysismentioning

confidence: 87%

“…The transformation of the Li + coordination environment was favorable for the separation of lithium isotopes ( 6 Li, 7 Li) as a result of the increasing of the coordination number and the weakening of the Li‐O bond . For example, the maximum single‐stage 6 Li/ 7 Li separation factor has achieved 1.046 ± 0.002 for the B15C5/[C 8 mim][PF 6 ]/CF 3 COOLi aq extraction system, which is an obvious increase compared to the separation factor in the absence of IL (1.035 ± 0.002) . Xiao et al have also announced an increase in the separation factor of 6 Li/ 7 Li using benzo‐15‐crown‐5 in a liquid–liquid extraction system with 3‐hexyl‐1‐methylimidazole hexafluorophosphate ([C 6 mim][PF 6 ]) as solvent .…”

Section: LI Nmr Analysismentioning

confidence: 97%

“…Besides, rare reports have investigated the coordination of Li species in the solvent extraction system with the addition of IL. Knowledge of the coordination environment of Li + is helpful for evaluating the separation of lithium isotopes ( 6 Li, 7 Li) in this solvent extraction process, which is the interest of many scientists for the increasing use of 6 Li/ 7 Li in nuclear energy generation and strategic fields …”

Section: Introductionmentioning

confidence: 99%

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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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Section: Ir Analysismentioning

confidence: 87%

Section: LI Nmr Analysismentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…[32,33] Moreover, macrocyclic ligands could potentially be tuned to provide the best fit for specific cations and oxidation states by varying the size of the ligand's inner cavity. [34] There are many types of macrocyclic ligands known to date with much attention having focused on N-donor ligands. Another important family of macrocyclic ligands are crown ethers and thio-crown ethers, the capacity of which to form stable complexes with transition metals is well-known.…”

Section: +mentioning

confidence: 99%

Periodic Trends in Actinyl Thio-Crown Ether Complexes

Liu

Gibson

et al. 2018

Inorg. Chem.

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In-cavity complexes and their bonding features between thio-crown (TC) ethers and f-elements are unexplored so far. In this paper, actinyl(VI) (An = U, Np, Pu, Am, and Cm) complexes of TC ethers have been characterized using relativistic density functional theory. The TC ether ligands include tetrathio-12-crown-4 (12TC4), pentathio-15-crown-5 (15TC5), and hexathio-18-crown-6 (18TC6). On the basis of the calculations, it is found that the "double-decker" sandwich structure of AnO(12TC4) and "side-on" structure AnO(12TC4) are changed to "insertion" structures for AnO(15TC5) and AnO(18TC6) due to increased size of the TC ether ligands. The actinyl monocyclic TC ether complexes are found to exhibit conventional conformations, with typical An-O and An-S distances and angles. Chemical bonding analyses by Weinhold's natural population analysis (NPA), natural localized molecular orbital (NLMO), and energy decomposed analysis (EDA), show that a typical ionic An-S bond with the extent of covalent interaction between the An and S atoms primarily attributable to the degree of radial distribution of the S 3p atomic orbitals. The similarity and difference of the oxo-crown and TC ethers as ligands for actinide coordination chemistry are discussed. As soft S-donor ligands, TC ethers may be candidate ligands for actinide recognition and extraction.

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“…The more important is that the resin is producible. Further, Zhou et al 12 synthesized mesoporous silica materials doped with ionic liquids and B15C5 for lithium isotope separation, and the separation factor obtained was up to 1.046.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-graft-benzo-15-crown-5-ether/PVA Blend Membrane with Sponge-Like Pores for Lithium Isotope Adsorptive Separation

et al. 2018

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Crown ether exhibits a high separation coefficient for lithium isotope separation owing to its precise size selectivity to cations. A crown ether-based solid–liquid extraction method for the lithium isotope separation with a high extraction efficiency is regarded as a valid alternative to the classic liquid–liquid method. A chitosan- graft -benzo-15-crown-5-ether (CTS- g -B15C5)/polyvinyl alcohol (PVA) porous blend membrane for lithium isotope adsorptive separation was fabricated by immersion–precipitation–phase inversion. Results indicated that the finger-like structure of the blend membrane was replaced gradually by a sponge-like structure with the increase of the CTS- g -B15C5 concentration from 20 to 50 wt %. Meanwhile, the porosity and mechanical strength of the blend membrane slightly decreased from 76.9% and 2.68 MPa to 72.5% and 2.02 MPa, respectively, whereas the average pore size increased from 0.33 to 0.73 μm. The obtained CTS- g -B15C5/PVA (50/50 wt/wt) blend membrane exhibited a sponge-like asymmetrical gradient structure and good mechanical strength and used for the solid–liquid extraction experiment. It is found that the distribution coefficient increased from 13.50 to 49.33, and the single-stage separation factor increased from 1.008 to 1.046 with the immobilization amount of crown ether from 1.07 to 2.60 mmol·g –1 . It also meets the acceptable separation factor of 1.03 in a large scale of lithium isotope separation. In addition, 6 Li and 7 Li were enriched in the solid or membrane phase and the aqueous phase, respectively. In summary, the blend membrane has great potential applications in the development of green and highly efficient membrane chromatography for lithium isotope separation.

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A green strategy for lithium isotopes separation by using mesoporous silica materials doped with ionic liquids and benzo-15-crown-5

Cited by 42 publications

References 47 publications

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

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

Periodic Trends in Actinyl Thio-Crown Ether Complexes

Chitosan-graft-benzo-15-crown-5-ether/PVA Blend Membrane with Sponge-Like Pores for Lithium Isotope Adsorptive Separation

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