Selective recovery of Au(III), Pt(IV), and Pd(II) from aqueous solutions by liquid–liquid extraction using ionic liquid Aliquat-336

Aliquat-336-impregnated alginate capsule (Aliquat-336-AC) was fabricated using a facile method. Ionic liquid Aliquat-336 was used as a model extractant owing to its good extraction performance toward precious metals (PMs). Aliquat-336-AC was prepared by dropping the mixture solution (Aliquat-336 + Tween 80 + CaCl2) into the alginate solution. CaCl2was used to form Ca-alginate shell, leading to Aliquat-336-AC. Two types of binary metal solutions, Au (III)/Pt (IV) and Au (III)/Pd (II) were used to evaluate metal sorption capacity of Aliquat-336-AC. The maximum Au (III) uptake in Au (III)/Pt (IV) and Au (III)/Pd (II) systems were 61.38 and 82.97 mg/g, respectively. Whereas, the uptakes of Pt (IV) and Pd (II) were almost closed to zero, indicating excellent Au (III) selectivity of Aliquat-336-AC. A comparative study was carried out between liquid/liquid extraction (LLE) using Aliquat-336 and solid/liquid adsorption (SLA) using Aliquat-336-AC for Au (III) selective recovery from Au (III)/Pt (IV) and Au (III)/Pd (II) solutions. The data of selectivity coefficients (αsel) showed that the values of αAu/Ptand αAu/Pdwere 10253.34 and 5817.61 in the SLA system, respectively. These values were much higher than 2033.38 of αAu/Ptand 1879.80 of αAu/Pdin the LLE system. Therefore, Aliquat-336-AC can be used as a selective adsorbent for Au (III).

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Application of ionic liquid based on Aliquat 336 and D2EHPA in the extraction of transition metals

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1212/1/012021 ◽

2022 ◽

Vol 1212 (1) ◽

pp. 012021

Author(s):

M I Fedorova ◽

A V Levina

Keyword(s):

Ionic Liquid ◽

Transition Metal ◽

Metal Ions ◽

Transition Metal Ions ◽

Liquid Extraction ◽

Phase System ◽

Aliquat 336 ◽

Polypropylene Glycol ◽

Two Phase ◽

Liquid Liquid Extraction

Abstract To date, there are a number of methods for selective extraction of transition metal ions based on liquid-liquid extraction. One of the most interesting methods of metal ions extraction is liquid-liquid extraction with application of ionic liquids based on quaternary ammonium bases and organic acid residues, in particular, organophosphorus, diluted with organic solvent (toluene, xylene, kerosene, etc.). However, using of organic solvents does not correspond to the modern tendencies of harmful effects on the environment reducing. Thus, we propose to use Aliquat 336 and D2EHPA-based ionic liquid for extraction of transition metal ions in ecologically safe aqueous two-phase system based on polypropylene glycol 425 and sodium chloride. Di(2-ethylhexyl) phosphate trioctylmethylammonium has been shown to yield more than 80% Fe(III) and Y(III) ions.

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Enhanced Homogeneous Liquid–Liquid Extraction for the Selective Recovery of Sc(III) by Novel UCST-Type Ionic Liquids

ACS Sustainable Chemistry & Engineering ◽

10.1021/acssuschemeng.1c03162 ◽

2021 ◽

Author(s):

Yi Zhang ◽

Yu Deng ◽

Weidong Guo ◽

Donghao Liu ◽

Yigang Ding

Keyword(s):

Ionic Liquids ◽

Liquid Extraction ◽

Selective Recovery ◽

Homogeneous Liquid ◽

Liquid Liquid Extraction

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Development of trace analysis for alkyl methanesulfonates in the delgocitinib drug substance using GC-FID and liquid–liquid extraction with ionic liquid

Open Chemistry ◽

10.1515/chem-2020-0093 ◽

2020 ◽

Vol 18 (1) ◽

pp. 1020-1029

Author(s):

Shinkichi Nomura ◽

Yoshiharu Ito ◽

Shigehiko Takegami ◽

Tatsuya Kitade

Keyword(s):

Ionic Liquid ◽

Trace Analysis ◽

Direct Injection ◽

Liquid Extraction ◽

Drug Substance ◽

Flame Ionization ◽

Liquid Liquid Extraction ◽

Accuracy And Precision ◽

Sensitivity And Selectivity ◽

Chloride Water

AbstractAlkyl methanesulfonates are genotoxic impurities that should be limited to an intake of not more than 1.5 µg/day, as regulated by the International Council for Harmonization guideline M7. We herein report a trace analysis of methyl methanesulfonate (MMS), ethyl methanesulfonate (EMS), and isopropyl methanesulfonate (IPMS) in the delgocitinib drug substance using liquid–liquid extraction, with an ionic liquid as the sample-solving medium, and direct injection gas chromatography detected with a flame-ionization detector. The proposed method takes advantage of the fine solubility of ionic liquids toward the drug substance, the good extraction efficiency of alkyl methanesulfonates in liquid–liquid extraction using the Chem Elut cartridge with low-polar organic solvents, and the ability of alkyl methanesulfonates to concentrate in minimum amounts of organic solvent, resulting in excellent sensitivity and selectivity. Specifically, for the preparation of the sample solution, a mixture of 1-butyl-3-methylimidazolium chloride, water, and acetonitrile was used as the sample-solving media, extracted with diethyl ether, and the eluent was concentrated to 1 mL. The method showed good linearity, accuracy, and precision from 1 to 5 ppm, and the limits of detection of MMS, EMS, and IPMS were 0.1, 0.05, and 0.05 ppm, respectively.

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