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Efficient separation of vanadium from chromium by a novel ionic liquid-based synergistic extraction strategy
Zhao, Junmei; Hu, Qiaoyu; Li, Yingbo; Liu, Huizhou

Ionic liquid (IL)-based extraction is a promising and environmentally benign separation technology. To develop sustainable extraction technologies, quaternary ammonium-based IL extraction strategy is attractable. In this work, the separation of vanadium(V) from chromium(VI) by pure tricaprylmethylammonium nitrate ([A336][NO3]) and organic acidified primary amine N1923 ([RNH3][NO3]) was systematically investigated. The optimal proportion of [A336][NO3] and [RNH3][NO3] was studied and results showed that the mixed [A336][NO3] and [RNH3][NO3] exhibited an obvious synergistic-effect for V(V). The extraction of V(V) was strongly dependent on the acidity of the aqueous phase and reaches maximum at pH 2.5-3, while the maximum separation coefficient (beta(v/cr)) was located at about pH 9.0. Moreover, beta(v/cr) could be improved through adjusting the molar concentration ratio of V/Cr. The interference of coexisting anions (nitrates, chlorides, sulfate and phosphate) on the extraction of V(V) was examined and the results showed that PO43-, NO3- and Cl- had negative effects at various degrees except for SO42-. The V(V) extraction behaviors could be properly described by Langmuir and pseudo-second-order rate equations. The maximum extraction capacity for V(V) was estimated as 1.877 mmol/g at 303 K. Increased temperature had little effect on the extraction capacity, but greatly improved the extraction rate. The typical anion exchange mechanism between NO3- and V4O124- (or V3O93-) was proposed for the current extraction system. The IL phase could be renewed through stripping the loaded vanadium by a 0.5 M NaNO3 solution. This work demonstrated that quaternary ammonium IL containing a commercial organic extractant is an efficient and sustainable IL-based extraction strategy for the separation of vanadium from chromium, and as a result, the development of an IL-based extraction process is straightforwardly envisaged. (C) 2014 Elsevier B.V. All rights reserved.

Keyword[A336][No3] Acidified N1923 Vanadium(v) Chromium(Iv) Il-based Extraction
Subject AreaEngineering
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordSolvent-extraction ; Selective Extraction ; Aqueous-solutions ; Temperature ; Acid ; Oxidation ; Media ; Water ; Imidazolium ; Recovery
Funding ProjectNSFC [51090382, 51104138]
WOS Research AreaEngineering
WOS SubjectEngineering, Environmental ; Engineering, Chemical
WOS IDWOS:000350191800054
Citation statistics
Cited Times:45[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhao, Junmei
AffiliationChinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Junmei,Hu, Qiaoyu,Li, Yingbo,et al. Efficient separation of vanadium from chromium by a novel ionic liquid-based synergistic extraction strategy[J]. CHEMICAL ENGINEERING JOURNAL,2015,264(MAR):487-496.
APA Zhao, Junmei,Hu, Qiaoyu,Li, Yingbo,&Liu, Huizhou.(2015).Efficient separation of vanadium from chromium by a novel ionic liquid-based synergistic extraction strategy.CHEMICAL ENGINEERING JOURNAL,264(MAR),487-496.
MLA Zhao, Junmei,et al."Efficient separation of vanadium from chromium by a novel ionic liquid-based synergistic extraction strategy".CHEMICAL ENGINEERING JOURNAL 264.MAR(2015):487-496.
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