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A novel ion-pair strategy for efficient separation of lithium isotopes using crown ethers
Cui, Li1; Li, Shasha1; Kang, Jin1; Yin, Caixia2; Guo, Yanxia1; He, Hongyan3; Cheng, Fangqin1
2021-11-01
Source PublicationSEPARATION AND PURIFICATION TECHNOLOGY
ISSN1383-5866
Volume274Pages:12
Abstract

Effective separation of lithium isotopes (6Li and 7Li) is of great importance for the development of nuclear energy. Crown ethers (CEs) are widely used and reported separation systems, but the distribution coefficient of Li (DLi) is relatively low by CEs (DLi, 10- 2 & ndash;10- 5) and mainly depends on the anion type of Li salt. Herein, a novel and facile ion-pair strategy by introducing tetrachloridoferrate ([FeCl4]- ) as counter anion is presented, which helps to overcome the Hofmeister bias and facilitates the efficient transfer of Li+ from extremely hydrophilic chlorides. An exceptionally high DLi of 54 is achieved for benzo-15-crown-5 (B15C5), surpassing those of solvent extraction from solely Li salt aqueous solution. This strategy also demonstrates good separation performance of 6Li/7Li. The maximum 6Li/7Li separation factors (alpha 6Li/ 7Li) of 1.038 and 1.049 are obtained for B15C5 and benzo12-crown-4 (B12C4) in dichloroethane at 273 K. The highly efficient phase transfer of Li+ can be attributed to the formation of stable [Li(B15C5)(H2O)][FeCl4] or [Li(B12C4)2][FeCl4] ion pairs. Theoretical studies based on density functional theory (DFT) calculations suggest that the coordination and electrostatic environment of Li+ plays an essential role in the separation of 6Li/7Li. Weakening the coordination and electrostatic interactions associated with Li+ can facilitate the separation of 6Li/7Li. Additionally, B15C5 can be easily recycled by using ultra-pure water as the stripping solution. This work provides an industrially promising system for 6Li/7Li separation.

KeywordLithium Isotopes Crown Ethers Ion Pair Urey Model Dft Calculation
DOI10.1016/j.seppur.2021.118989
Language英语
WOS KeywordLiquid-liquid-extraction ; Icar Atrp Technique ; Dibenzo-14-crown-4 Ether ; Mesoporous Silica ; Wave-function ; Solvent ; Complexes ; Fractionation ; Architecture ; Prediction
Funding ProjectNational Natural Science Foundation of China[21706257] ; National Natural Science Foundation of China[21878180] ; National Natural Science Foundation of China[21922813] ; Key R&D and transformation plan of Qinghai Province[2020-GX-101] ; Youth Innovation Promotion Association of CAS[2017066]
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Foundation of China ; Key R&D and transformation plan of Qinghai Province ; Youth Innovation Promotion Association of CAS
WOS IDWOS:000668937600002
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/49301
Collection中国科学院过程工程研究所
Corresponding AuthorHe, Hongyan; Cheng, Fangqin
Affiliation1.Shanxi Univ, Inst Resources & Environm Engn, Taiyuan 030006, Peoples R China
2.Shanxi Univ, Inst Mol Sci, Taiyuan 030006, Shanxi, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Cui, Li,Li, Shasha,Kang, Jin,et al. A novel ion-pair strategy for efficient separation of lithium isotopes using crown ethers[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2021,274:12.
APA Cui, Li.,Li, Shasha.,Kang, Jin.,Yin, Caixia.,Guo, Yanxia.,...&Cheng, Fangqin.(2021).A novel ion-pair strategy for efficient separation of lithium isotopes using crown ethers.SEPARATION AND PURIFICATION TECHNOLOGY,274,12.
MLA Cui, Li,et al."A novel ion-pair strategy for efficient separation of lithium isotopes using crown ethers".SEPARATION AND PURIFICATION TECHNOLOGY 274(2021):12.
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