Speciation of indium(III) chloro complexes in the solvent extraction process from chloride aqueous solutions to ionic liquids

被引：40

作者：

Deferm, Clio ^{[1
,2
]}

Onghena, Bieke ^{[1
]}

Vander Hoogerstraete, Tom ^{[1
]}

Banerjee, Dipanjan ^{[4
]}

Luyten, Jan ^{[2
]}

Oosterhof, Harald ^{[2
]}

Fransaer, Jan ^{[3
]}

Binnemans, Koen ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F,Bus 2404, B-3001 Heverlee, Belgium

[2] Umicore, Grp Res & Dev Competence Area Recycling & Extract, Watertorenstr 33, B-2250 Olen, Belgium

[3] Katholieke Univ Leuven, Dept Mat Engn, Kasteelpk Arenberg 44,Bus 2450, B-3001 Heverlee, Belgium

[4] ESRF European Synchrotron, Dutch Belgian Beamline DUBBLE, CS 40220, F-38043 Grenoble 9, France

来源：

DALTON TRANSACTIONS | 2017年 / 46卷 / 13期

关键词：

HYDROCHLORIC-ACID SOLUTIONS; NUCLEAR-MAGNETIC-RESONANCE; SELECTIVE EXTRACTION; QUATERNARY AMMONIUM; TRANSITION-METALS; RARE-EARTHS; IRON IONS; REMOVAL; WATER; SEPARATION;

D O I：

10.1039/c7dt00618g

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Most metal extraction studies focus on the kinetics, the maximum loading and the extraction equilibrium, while structural information on the extracted complexes has been limited. This paper concerns the nature of the indium(III) chloride complexes, present in the organic and aqueous phase during the solvent extraction of indium(III) from an aqueous HCl solution by undiluted ionic liquids Cyphos (R) IL 101 and Aliquat (R) 336. In an aqueous HCl solution (0-12 M), indium(III) exists as octahedral mixed complexes, [In(H2O)(6-n)Cl-n](3-n) (0 <= n <= 6). EXAFS and In-115 NMR were used to characterize these species. The stoichiometric composition of the extracted complexes, which is estimated from viscosity and maximum loading studies and confirmed by EXAFS, is unaffected by the HCl concentration in the aqueous phase. Indium(III) is present in the ionic liquid phase as the tetrahedral [InCl4](-) complex. Based on the speciation results an extraction mechanism is proposed.

引用

页码：4412 / 4421

页数：10

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