Ionic Liquid Extraction System Research Articles

Extraction Behavior of Mercury(II) and Cadmium(II) in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and 8-Hydroxyl-Quinoline

The extraction behavior of metal ions (Hg2+ and Cd2+, M2+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl- imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and 8-hydroxyl-quinoline (HQ) as extractant. The extraction percentage of M2+ using [Bmim]PF6 was less than 5% without HQ. When sufficient HQ was included in IL phase, the extraction percentage of M2+ could be higher than 98%. The extracted species in the M2+-[Bmim]PF6-HQ system was neutral MQ2 and the recovery of M2+ extracted into [Bmim]PF6 can be achieved using 0.25 mol•L-1 HNO3 as stripping agent. [Bmim]PF6 can be recycled in the experiment.

Extraction Behavior of Rare Earths in Ion Liquid Extraction System Using 1-Butyl-3-Methyl-Imidazolium Hexafluorophosphate and Benzoyl Acetone

The extraction behavior of five rare earth ions (RE3+) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl-imidazolium hexafluorophosphate ionic liquid ([Bmim]PF6) as extraction solvent and benzoyl acetone (HA) as extractant. The extraction percentage of RE3+ using [Bmim]PF6 was less than 8% without HA. When sufficient HA was included in IL phase, the extraction percentage of RE3+ could be higher than 98%. The extracted species in the RE3+-[Bmim]PF6-HA system was neutral REA3 and the recovery of RE3+ extracted into [Bmim]PF6 can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid (EDTA) as stripping agent. [Bmim]PF6 can be recycled in the experiment.

Determination of Trace Chlorophenols Endocrine Disrupting Chemicals in Water Sample Using [Bmim]BF4-NaH2PO4 Aqueous Two-Phase Extraction System Coupled with High Performance Liquid Chromatography

Abstract Determination of trace endocrine-disrupting chemicals such as chlorophenols in a water sample was carried out by utilizing ionic liquid aqueous two-phase extraction systems coupled with high-performance liquid chromatography (HPLC). In our study, the target analytes were 2,4-dichlorophenol (2,4-DCP), 2,6-dichlorophenol (2,6-DCP) and 4-chlorophenol (4-CP). The effects of salt concentration, pH value of aqueous phase, extraction time and the amount of ionic liquid on extraction efficiency were investigated. The highest extraction efficiency for these three target analytes were obtained as the concentrations of NaH 2 PO 4 aqueous, pH value, extraction time and the amount of ionic liquid were 0.5 g mL −1 , 4.0, 4 min and 2 mL, respectively. Ionic liquid phase was analyzed by HPLC directly with the detection limits of 2, 11 and 5 μg L −1 ( S/N = 3) for 2,4-DCP, 2,6-DCP and 4-CP, respectively. Good recovery results (90.2%–107.0%) with relative standard deviation ranging from 1.2% to 5.2% ( n = 5) were obtained when this method was applied to determine these three chlorophenols in tap water, lake water, waste water of chemical industry.

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

Recently, an alkylhistidine extractant His-EH (histidine-2-ethylhexylamide) was found to be efficient for the extraction of intermediate transition metal ions. In the present study, the extraction mechanism of Co(II) using His-EH in an ionic liquid extraction system using 1-hexyl-3-methylimidazolium hexafluorophosphate ([hmim][PF6]) as the diluent was investigated. The stoichiometries of the complex between His-EH and Co(II) in the ionic liquid and in chloroform were found to be different. The results of slope analysis confirmed that Co(II) was extracted using His-EH by a cation-exchange reaction according to the following equation: Co2+(aq) + 3His-EH(IL) + 2(hmim+PF6-)(IL) = Co2+(His-EH)3(PF6-)2(IL) + 2hmim+(aq).

Ionic liquid extraction systems utilizing ion recognition

Ionic liquid extraction systems utilizing ion recognition

Cooperative intramolecular interaction of diazacrown ether bearing β-diketone fragments on an ionic liquid extraction system

A novel extractant beta-diketone-substituted diaza-18-crown-6 demonstrated very efficient extraction of Sr(2+) due to an intramolecular synergistic effect on the ionic liquid extraction system and recovery of Sr(2+) from the ionic liquid was successfully achieved under acidic conditions.

Use of 8-sulfonamidoquinoline derivatives as chelate extraction reagents in ionic liquid extraction system

Possible use of 8-sulfonamidoquinoline derivatives as chelate extraction reagents for solvent extraction of several divalent metal cations using an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6]) as extraction phase was investigated as fundamental approach to develop novel extraction reagents for ionic liquid extraction system. The studied reagents were able to be used as extractants for the metal cations in the [bmim][PF 6] extraction system. Furthermore, their extractability in the [bmim][PF 6] system was superior to that in chloroform system. Most of the extracted species were (hydrated) neutral complexes, whereas, in use of the derivative having trifluoromethyl group, Cd 2+ was extracted as anionic complex accompanied with anion-exchange process.

Solvent extraction of amino acids into a room temperature ionic liquid with dicyclohexano-18-crown-6.

Amino acids Trp, Gly, Ala, Leu are extracted efficiently from aqueous solution at pH 1.5-4.0 (Lys and Arg at pH 1.5-5.5) into the room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF(6)) with dicyclohexano-18-crown-6 (CE). The most hydrophilic amino acids such as Gly are extracted as efficiently as the less hydrophilic (92-96%). The influence of pH, amino acid and crown ether concentration, volume ratio of aqueous and organic phases, and presence of some cations on amino acid recovery were studied. The ratio of amino acid to crown ether in the extracted species is 1:1 for cationic Trp, Leu, Ala, and Gly and to 1:2 for dicationic Arg and Lys. This ionic liquid extraction system was used successfully for the recovery of amino acids from pharmaceutical samples and fermentation broth, and was followed by fluorimetric determination.