期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 131, 期 -, 页码 94-101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2014.05.003
关键词
[C(8)mim][PF6]; Vanadium(V); Chromium(IV); Extraction
资金
- Major Project of NSFC [51090382]
- NSFC [51104138]
- 973 Projects [2012CBA01202, 2013CB632602]
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-201-1]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars from State Education Ministry (SRF for ROCS, SEM)
Separations among vanadium(V) and chromium(VI) remain challenging. The extraction behaviors of V(V) along with Cr(VI) by a few of pure imidazolium-based hydrophobic ionic liquids have been investigated. Among these hydrophobic ionic liquids, [C(8)mim][PF6] exhibits a special extraction for V(V) while a weak extraction for Cr(VI). The extraction behavior of V(V) by [C(8)mim][PF6] was particularly studied. The extraction of V(V) is strongly dependent on the acidity of the aqueous phase, and the maximum separation factor between V and Cr (beta(V/Cr)) was calculated to be 100.6 in case of pH 3.5. The most probable extraction mechanism of V(V) has been proposed to be the anion exchange between the main species HV10O273- and PF6-. Furthermore, V(V) in IL phase can be quantitatively stripped by KPF6 solution under the basic condition (C-OH(-) = 1 mol/l). Recycle test indicates that the extraction capacity shows no apparent decline until the 9th continuous extraction-stripping cycle. The result also provides a new approach for the preparation of a novel ionic liquid with metal oxo-anions as counter anion. (C) 2014 Elsevier B.V. All rights reserved.
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