Solvent extraction of lithium ions by tri-n-butyl phosphate using a room temperature ionic liquid

被引：187
作者：
Shi, Chenglong [1 ,2 ]
Jing, Yan [1 ]
Jia, Yongzhong [1 ]
机构：
[1] Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2016年 / 215卷
基金：
中国国家自然科学基金;
关键词：
Ionic liquid; Tri-n-butyl phosphate; Lithium; Extraction; TRIBUTYL-PHOSPHATE; AQUEOUS-SOLUTION; SALT LAKE; RECOVERY; EQUILIBRIA; BATTERIES; CHLORIDE; SYSTEMS; BRINE; TBP;
D O I：
10.1016/j.molliq.2016.01.025
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Separation among lithium ion and magnesium ion remains challenging. In this work, solvent extraction of lithium ions from the Mg(II)-containing salt lake brine into a commonly used ionic liquid 1-butyl-3-methylimidazolium bis(trifiuoromethylsulfonyl) imide ([C(4)mim][NTf2]) using the neutral phosphorus compound tri-n-butyl phosphate (TBP) as the extractant was investigated. The extraction behavior of lithium ions was investigated as a function of various parameters: acidity of the salt lake brine, dosage of ionic liquid and phase ratio. Under the optimal conditions, the single extraction efficiency of lithium was 92.37%, which indicated that it was an efficient extraction system for the recovery of lithium ions. Based on the study of thermodynamics, thermodynamic parameters of the lithium ion extraction reaction were obtained. The extracted species were ascertained from slope analysis method which indicated 1:1 (metal:ligand) ratio in the complex. UV-visible and Fourier transform infrared spectroscopy (FTIR) studies were also carried out to understand the nature of the extracted species. (C) 2016 Elsevier B.V. All rights reserved.
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收藏
页码：640 / 646
页数：7
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