Lithium isotope separation effect of N-phenylaza-15-crown-5

doi:10.1016/j.molliq.2021.115467

	Lithium isotope separation effect of N-phenylaza-15-crown-5
	Zhang, Qian; Jia, Yongzhong; Sun, Jinhe; Zhang, Pengrui; Huang, Chaochi; Wang, Mingyong; Xue, Zixuan; Wang, Ciming; Shao, Fei; Tong, Fengtai; Xiao, Yilin; Jing, Yan
第一作者	Zhang, Qian
	2021-05-15
发表期刊	JOURNAL OF MOLECULAR LIQUIDS
ISSN	0167-7322
卷号	330
摘要	Azacrown ethers contain multiple coordination sites, which show specific complexation to alkali metal ions. In this research, a neoteric liquid-liquid extraction system was investigated for the selective separation of lithium isotope using N-phenylaza-15-crown-5 (Ph-N15C5) as chelating agent and [BMIm][ NTf2] and anisole as extraction solvent. The effects of the counter anions of lithium salt, concentrations of crown ether, temperature, extraction equilibrium time and concentrations of lithium salt solution on the separation of lithium isotope with Ph-N15C5 were studied. The maximum extraction efficiency of lithium ions was 41.54% and the maximum single-stage separation factor (alpha) of Li-6/Li-7 obtained in the present study was 1.025, indicating that the lighter isotope Li-6 was enriched in organic phase while the heavier isotope Li-7 was concentrated in the aqueous phase. The complexation ratio of the lithium crown ether complex was determined as 1:1 by the slope analysis method. The lithium ions in the aqueous phase were extracted into the organic phase to form [Li(Ph-N15C5)](+) complex. The thermodynamic data obtained at different temperatures demonstrated that lithium isotope exchange was a spontaneous exothermic process, and lowering the temperature was beneficial to increase the separation factor. In addition, the system reached the extraction equilibrium after 60 min. This high efficiency and green liquid-liquid extraction system has potential application in lithium isotope separation. (C) 2021 Elsevier B.V. All rights reserved.
DOI	10.1016/j.molliq.2021.115467
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/34177
专题	盐湖资源综合利用工程技术中心
推荐引用方式 GB/T 7714	Zhang, Qian,Jia, Yongzhong,Sun, Jinhe,et al. Lithium isotope separation effect of N-phenylaza-15-crown-5[J]. JOURNAL OF MOLECULAR LIQUIDS,2021,330.
APA	Zhang, Qian.,Jia, Yongzhong.,Sun, Jinhe.,Zhang, Pengrui.,Huang, Chaochi.,...&Jing, Yan.(2021).Lithium isotope separation effect of N-phenylaza-15-crown-5.JOURNAL OF MOLECULAR LIQUIDS,330.
MLA	Zhang, Qian,et al."Lithium isotope separation effect of N-phenylaza-15-crown-5".JOURNAL OF MOLECULAR LIQUIDS 330(2021).