Separation of scandium(III) from lanthanides(III) with room temperature ionic liquid based extraction containing Cyanex 925

Sun, Xiaoqi; Wu, Dong; Chen, Ji; Li, Deqian

doi:10.1002/jctb.1664

Cited by 96 publications

(42 citation statements)

References 26 publications

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“…Such cationic (anionic) mechanisms have been demonstrated through the addition of the IL cation (anion) as its chloride salt (lithium salt) to the upper phase, [57][58][59] which induces a decrease in the distribution ratio, as described by Equation (2) [Eq. (3), respectively)].…”

Section: Discussionmentioning

confidence: 99%

Modulating the Solubilities of Ionic Liquid Components in Aqueous–Ionic Liquid Biphasic Systems: A Q‐NMR Investigation

2015

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Aqueous-ionic liquid (A-IL) biphasic systems have been examined in terms of deuterated water, acid, and IL cation and anion mutual solubilities in the upper (water-rich, in mole fraction) and lower phase of aqueous/IL biphasic systems at ambient temperature. The biphasic mixtures were composed of deuterated acids of various concentrations (mainly DCl, DNO(3), and DClO(4) from 10(-2) to 10(-4) M) and five ionic liquids of the imidazolium family with a hydrophobic anion (CF(3)SO(2))(2) N(-), that is, [C1 Cn im][Tf(2)N], (n=2, 4, 6, 8 and 10). The analytical techniques applied were (1) H NMR, (19) F NMR, Karl-Fischer titration, pH potentiometry for IL cations and anions, and water and acid determination. The effects of the ionic strength (μ=0.1 M NaCl and NaNO(3) as well as μ=0.1 M, 0.2 M and 0.4 M NaClO(4), according to the investigated acid), the nature of the IL cation, and the nature of the mineral acid on the solubilities of the (D(2)O, D(+), Tf(2)N(-), C1 Cn im(+)) entities in the lower or upper phases were determined. The addition of sodium perchlorate was found to enhance the Tf(2)N(-) solubility while inhibiting the solubility of the ionic liquid cation. Differences in IL cation and anion solubilities of up to 42 mM were evidenced. The consequences for the characterization of the aqueous biphasic system, the solvent extraction process of the metal ions, and the ecological impact of the ILs are discussed.

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Section: Discussionmentioning

confidence: 99%

Modulating the Solubilities of Ionic Liquid Components in Aqueous–Ionic Liquid Biphasic Systems: A Q‐NMR Investigation

2015

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“…The reversed extraction selectivity in RTILs relative to isooctane for a series of lanthanides in the presence of N, N,N',N'-tetra(n-octyl)diglycolamide was reported (Murding & Tang, 2010). The separation of Sc 3+ from a mixture of Sc 3+ , La 3+ , Y 3+ and Yb 3+ in an aqueous phase by Cyanex 925 into octylimidazolium hexafluorophosphate has been registered (Sun et al, 2007), while some task-specific RTILs provided almost quantitative uranyl ion extraction (Srncik et al, 2009). The use of RTILs-based liquid membranes for cation separations is less common.…”

Section: Cation Separations By Rtil Based Liquid Membranes and Suppormentioning

confidence: 99%

Formation of Complexes in RTIL and Ion Separations

Popov¹,

Vendilo²,

Pletnev³

et al. 2011

Ionic Liquids: Theory, Properties, New Approaches

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“…Liquid-liquid extraction systems using ionic liquids (ILs) as diluent have attracted attention, due to their unique properties such as high thermal stability, negligible vapor pressure, and non-flammability [1][2][3][4][5][6]. Some ILs made up by combination between hydrophobic cations and anions are immiscible with water and available as diluents for liquid-liquid extraction.…”

Section: Introductionmentioning

confidence: 99%

Extraction Mechanism of Cobalt(II) Using an Alkylated Histidine Extractant in an Ionic Liquid System

Morizono

Oshima

Baba

2011

SERDJ

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Separation of scandium(III) from lanthanides(III) with room temperature ionic liquid based extraction containing Cyanex 925

Cited by 96 publications

References 26 publications

Modulating the Solubilities of Ionic Liquid Components in Aqueous–Ionic Liquid Biphasic Systems: A Q‐NMR Investigation

Modulating the Solubilities of Ionic Liquid Components in Aqueous–Ionic Liquid Biphasic Systems: A Q‐NMR Investigation

Formation of Complexes in RTIL and Ion Separations

Extraction Mechanism of Cobalt(II) Using an Alkylated Histidine Extractant in an Ionic Liquid System

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