NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Zhiyu Zhao,Xiaolong Zhou,Qingfen Meng,Pengrui Zhang,Fei Shao,Xiao Li,Huangda Li,Lianjing Mao,Tianyu Zheng,Yan Jing,Yongzhong Jia,Shuxuan Wang,Jinhe Sun
High abundance 6Li and 7Li are essential materials for the nuclear industry. In this article, the lithium isotope separation effect and lithium-ion transport of a “lithium salt aqueous solution (anolyte)|crown ethers–ionic liquid organic solution|ammonium chloride aqueous solution (catholyte)” electromigration system with B12C4, B15C5 and B18C6 as phase transfer catalysts were investigated systematically. The results show that separation factors can reach 1.028 (B12C4), 1.024 (B15C5) and 1.011 (B18C6), respectively, when LiCl solution is used as the anolyte. The separation effect mainly originated from interfaces between anolytes and organic solutions, and was less affected by an electric field. The separation effect between organic solution and catholytes was greatly affected by the electric field for B12C4 and B15C5 systems, which converted from 7Li-enrichment to 6Li-enrichment with increased voltage. For the B18C6 system it was less affected. Furthermore, lithium ion transport in B12C4, B15C5 and B18C6 systems was greatly promoted by the electric field, with the Li+ concentration in catholytes of B12C4, B15C5 and B18C6 systems increased from 0.088 mg L−1, 0.286 mg L−1 and 0.778 mg L−1 to 8.321 mg L−1, 7.422 mg L−1 and 4.631 mg L−1 respectively as the voltage increased from 2 V to 16 V. The B12C4 system has been confirmed as the optimal solution considering both the Li+ transport and isotope separation effect.
研究领域:
核化学
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物理化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2025
·Vol. 12
·期 2
·27
·
IF 2.7
Zhiyu Zhao,Lianjing Mao,Tianyu Zheng,Xiao Li,Chunsen Ye,Pengrui Zhang,Huifang Li,Wei Sun,Jinhe Sun
Enriched lithium isotopes (6Li and7Li) are essential in the nuclear energy industry, where6Li is bombarded with neutrons to produce tritium for fusion reactions, while7Li is used as a core coolant and pH regulator. Separation of6Li and7Li by electromigration is a promising method for producing enriched lithium isotopes that fulfill industrial needs. In this work, based on a previously proposed biphasic system electromigration routine, a three-stage system of ‘LiCl aqueous solution (anolyte)|B12C4-[EMIm][NTf2] organic solution|NH4Cl aqueous solution (catholyte)’ was constructed and the rules of lithium isotope separation and lithium-ion migration investigated. It was shown that the isotope enrichment effect of the catholyte was greatly affected by the experimental conditions, while that of the organic solution was less affected. As the B12C4 concentration increased, enhancement of7Li enrichment in the catholyte and6Li enrichment in the organic solution was observed, and α(C/O) and α(O/A) reached 0.975 and 1.018 at B12C4 of 0.5 mol/L. With the increase in current, migration time, and LiCl concentration, the isotope that was enriched in the catholyte trended from7Li to6Li (about 6 mA, 12 h or LiCl of 5 mol/L). Taking lithium-ion transport efficiency and lithium isotope separation effect into consideration together, a current of at least 6 mA, duration of at least 12 h, LiCl concentration of at least 1 mol/L and B12C4 concentration of 0.2 mol/L are suggested for the electromigration process. The work provides an important reference for system construction and experimental design of a biphasic electromigration separation method, which is expected to be an industrial alternative because of its environmental protection and high efficiency.
研究领域:
化学工程
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核能技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 4
·1916-1924
·
IF 3.925
Xiaolong Zhou,Pengrui Zhang,Qingfen Meng,Lianjing Mao,Huiqun Ju,Fei Shao,Yan Jing,Yongzhong Jia,Shuxuan Wang,Xingwu Zou,Jinhe Sun
Lithium isotopes play an essential role in the nuclear industry. The extraction method with crown ethers as extractants is considered as one of the promising methods for lithium isotope separation with good application prospects. However, the effects of crown ethers with different cavity sizes in the system containing ionic liquids on isotope enrichment in organic solution/aqueous solution have not been systematically investigated. With three typical benzo crown ethers (B12C4, B15C5 and B18C6) as extractants and the mixtures of ionic liquids and anisole as solvents, the effect of crown ethers on the extraction rate of Li+, separation factor and δ7Li variation in organic solution/aqueous solution was investigated with varied solvent composition, lithium salts and concentration of crown ethers. The order of extraction rates was: B15C5 (40.88%) > B18C6 (38.12%) > B12C4 (23.35%) and the order of isotope separation factors was: B15C5 (1.024) > B12C4 (1.023) > B18C6 (1.010) under optimized conditions. The δ7Li in aqueous solution of B15C5 systems was higher than those corresponding to the B12C4 and B18C6 system while the δ7Li in the organic solution of the B12C4 systems was more negative than those corresponding to the B15C5 and B18C6 system. So, B12C4 systems achieve better 6Li enrichment in the organic phase and B15C5 systems achieve better 7Li enrichment in the aqueous phase.
研究领域:
化学
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核工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Lianjing Mao,Xiaolong Zhou,Tianyu Zheng,Xiao Li,Xiufang Wang,Zhiyu Zhao,Wei Sun,Pengrui Zhang,Jinhe Sun
The metal ion extraction process is usually accompanied by the removal of coordinated water molecules and the change of water content in the extraction phase. However, hierarchical methodologies on water research are incredibly sparse, restricting a thorough knowledge of the extraction mechanism. It was clarified the diversity of water occurrence forms in the extraction phase and quantitative relationship between water, Li + and crown ether based on the (B12C4/B15C5/B18C6-[EMIm][NTf 2 ])-LiNTf 2 solvent extraction system. While the complexation mechanism between hydrated Li + and crown ether was discussed carefully. Firstly, it demonstrated that the water content of the extraction phase: B18C6 > B15C5 > B12C4. Secondly, the water in the extraction phase is mainly collected by solvent and crown ether, with the latter catching water primarily via Li + coordination and weak interactions. In the end, focusing on the water captured by the crown ether through Li + coordination, slope analysis and DFT calculations found that Li (H 2 O) 4 + was removed three water molecules to complex with B12C4 or B15C5, whereas B18C6 tends to remove two water molecules. It is precious for a thorough grasp of the mechanism and procedure of Li + extraction by crown ethers. What’s more, it offers novel strategies for investigating water content and transfer mechanisms in extraction systems.
研究领域:
化学
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材料科学
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理论研究
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）