Solution extraction of several lanthanides from nitric acid with isohexyl-BTP in [Cnmim][NTf2] ionic liquid

The extraction behavior of several lanthanides（La^3＋, Eu^3＋, Lu^3＋） from nitric acid（HNO3） solution was studied using a novel extraction system based on 2,6-bis（5,6-dihexyl-1,2,4-triazin-3-yl） pyridine（isohexyl-BTP） as extractant in 1-alkyl-3-methylimidazolium bis（trifluoromethylsufonyl）imide（[Cnmim...

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Bibliographic Details
Published in:Journal of rare earths 2015-11, Vol.33 (11), p.1182-1188
Main Author: 赵龙 董珍 马国龙 袁威津
Format: Article
Language:English
Subjects:
BTP
Cation exchanging
Chains
Exchange
Extraction
Ionic liquids
isohexyl-BTP
Lanthanides
Nitric acid
Rare earth metals
rare earths
提取
溶液
硝酸
离子液体
边坡稳定性分析
镧系元素
阳离子交换
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Summary:The extraction behavior of several lanthanides（La^3＋, Eu^3＋, Lu^3＋） from nitric acid（HNO3） solution was studied using a novel extraction system based on 2,6-bis（5,6-dihexyl-1,2,4-triazin-3-yl） pyridine（isohexyl-BTP） as extractant in 1-alkyl-3-methylimidazolium bis（trifluoromethylsufonyl）imide（[Cnmim][NTf2]） ionic liquid. Isohexyl-BTP in ionic liquids exhibited remarkably better extraction performance for lanthanides than that in octanol-dodecane（3：7 v/v） system. Lower HNO3 concentration and short alkyl chain length of [Cnmim]^＋ were more favourable for removal of lanthanides. Besides, it was confirmed that isohexyl-BTP in ILs formed a 1：3 complex [Ln（BTP）3（NO3）n]^（3–n）＋（n=0, 1） by slope analysis. In addition, [C2mim][NTf2] preferred to extract lanthanides via a cation exchange mechanism at lower acidity, which was proved via UV-Vis measurement. It was speculated that extraction mechanism shifted from cation exchange to neutral species extraction with increase in HNO3 concentration and alkyl chain length of [Cnmim]^＋ due to the H^＋ completion, NO3^- inhibition and hydrophobicity of IL.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(14)60544-5