An ionic liquid-based synergistic extraction strategy for rare earths

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	An ionic liquid-based synergistic extraction strategy for rare earths
	Zhu, Menghao 1,2; Zhao, Junmei 1,3; Li, Yingbo 1; Mehio, Nada 3; Qi, Yuruo 1,2; Liu, Huizhou 1; Dai, Sheng 3
刊名	GREEN CHEMISTRY
	2015
卷号	17 期号:5 页码:2981-2993
ISSN号	1463-9262
英文摘要	In this work, a novel IL-based synergistic extraction system utilizing the ionic liquid tricaprylmethyl-ammonium nitrate ([A336][NO3]) and the commercial extractant di(2-ethylhexyl) 2-ethylhexyl phosphonate (DEHEHP) was developed for the extraction of rare earth (RE) nitrates. Pr(III) was used as a model RE and the effects of key factors, i.e. the ratio of [A336][NO3] to DEHEHP, the acidity of feed solutions, and the concentration of a salting-out reagent, were systematically studied. Our results demonstrate that the mixture of [A336][NO3] and DEHEHP had an obviously synergistic extraction effect for the extraction of Pr(III). The maximum synergistic enhancement coefficient of 3.44 was attained at X-A = 0.4 (v%). Alternatively, a mixture of [A336][Cl] and DEHEHP hardly extracted Pr(III) from chloride media. Moreover, we investigated the Pr(III) extraction mechanism and demonstrated that Pr(III) can be extracted as the neutral complexation species Pr(NO3)(3)center dot chi DEHEHP and the ion-type species [A336](y)center dot Pr(NO3)(3+y). These extraction processes can effectively hamper the release of organic cation-ligands into the aqueous phase. The synergistic extraction effect is mainly derived from the enhanced solubility of the extracted species in the ionic liquid phase. The extraction behaviors of Pr(III) could be properly described by Langmuir and pseudo-second-order rate equations. An increase in temperature was unfavorable for the extraction reaction but greatly improved the extraction rate. Interestingly, the mixed IL extraction system has an obviously synergistic extraction effect for light REs (LREs, La-Eu), but an anti-synergistic effect for heavy REs (HREs, Gd-Lu, Y), thus indicating that our synergistic extraction system is helpful for the separation of LREs from HREs. In addition, the high selectivity between REs and non-REs suggested that the recovery of REs from a complicated high-salt leachate could be highly possible. It demonstrates that the IL-based synergistic extraction strategy developed in this work is promising and sustainable, and as a result the development of an IL-based synergistic extraction process for the recovery of REs is straightforwardly envisaged.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Chemistry, Multidisciplinary
研究领域[WOS]	Chemistry
关键词[WOS]	DI-(2-ETHYLHEXYL) 2-ETHYLHEXYL PHOSPHONATE ; SOLVENT-EXTRACTION ; NITRATE MEDIUM ; SELECTIVE EXTRACTION ; SUPERCRITICAL CO2 ; TRANSITION-METALS ; CYANEX 923 ; TEMPERATURE ; SEPARATION ; LANTHANIDES
收录类别	SCI
语种	英语
WOS记录号	WOS:000354409500044
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/19254]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA
推荐引用方式 GB/T 7714	Zhu, Menghao,Zhao, Junmei,Li, Yingbo,et al. An ionic liquid-based synergistic extraction strategy for rare earths[J]. GREEN CHEMISTRY,2015,17(5):2981-2993.
APA	Zhu, Menghao.,Zhao, Junmei.,Li, Yingbo.,Mehio, Nada.,Qi, Yuruo.,...&Dai, Sheng.(2015).An ionic liquid-based synergistic extraction strategy for rare earths.GREEN CHEMISTRY,17(5),2981-2993.
MLA	Zhu, Menghao,et al."An ionic liquid-based synergistic extraction strategy for rare earths".GREEN CHEMISTRY 17.5(2015):2981-2993.