Effect of hydrophobic ionic liquids aqueous solubility on metal extraction from hydrochloric acid media: Mathematical modelling and trivalent thallium behavior

Tereshatov, E. E.; Mazan, Valérie; Boltoeva, Maria; Folden, C. M.

doi:10.1016/j.seppur.2020.117650

Cited by 9 publications

(3 citation statements)

References 43 publications

(57 reference statements)

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“…As we all know, substituents greatly affect the physicochemical properties of ILs including stability, density, charge distribution, aqueous solubility, cation–anion interactions, and so on. Among the above properties, the charge distributions of ILs and aqueous solubilities have the greatest influences on the extraction performances. ,,− Therefore, we discuss the influences of N-substituents on extraction performances from the following two aspects.…”

Section: Resultsmentioning

confidence: 99%

“…15,39 Generally speaking, when the anions are the same, the greater the aqueous solubilities of ILs are and the worse the extraction efficiencies are. 38 As shown in Table S2 Thermodynamic and Kinetic Studies. The kinetic and thermodynamic behaviors were investigated to further explore the extraction behaviors of pyrrolidinium-based ILs.…”

Section: Effects Of N-substituents On Extraction Performances Accordi...mentioning

confidence: 99%

“…This interesting phenomenon urges us to further discuss the influences of Nsubstituents.The aqueous solubilities of ILs also play a key role in the extraction performance 15,39. Generally speaking, when the anions are the same, the greater the aqueous solubilities of ILs are and the worse the extraction efficiencies are 38. As shown in TableS2, OR-functionalized IL ([Pyr-C 2 OC 2 ][NTf 2 ]) has the highest hydrophilicity, and its solubility is 1.97 times high than that of R-functionalized IL ([Pyr-Bu][NTf 2 ]).…”

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confidence: 99%

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Selective and Efficient Gold Extraction from E-Waste by Pyrrolidinium-Based Ionic Liquids with Various N-Substituents

Liu

Wang

Liu

et al. 2023

ACS Sustainable Chem. Eng.

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With environmental problems and a shortage of resources, it is urgent to recover gold from electronic waste (e-waste). Meanwhile, it is necessary to explore the relationships between the structures and extraction performances of ionic liquids (ILs) to further improve the extraction capacities of ILs for gold. Herein, three pyrrolidinium-based ILs with various N-substituents were synthesized for solvent-free extraction of Au(III). The three pyrrolidinium-based ILs exhibited ultrahigh extraction capacities for Au(III) with the order of [Pyr-EA][NTf2] (524.6 mg·g–1) > [Pyr-Bu][NTf2] (457.3 mg·g–1) > [Pyr-C2OC2][NTf2] (403.5 mg·g–1). The effects of N-substituents on extraction performances were quantitatively investigated by electrostatic potential (ESP) and quantitative NMR. Among them, the ester group (−COOR) is the most beneficial to the extraction process, which is associated with an increased ESP value and boosted hydrophobicity. Notably, [Pyr-EA][NTf2] displayed outstanding selectivity in multimetal solutions; especially, it could selectively and efficiently extract Au(III) from the actual CPU. Furthermore, [Pyr-EA][NTf2] possesses significant reuseability and can maintain superior extraction efficiency of 84.3% after five cycles. These excellent performances together with low cost ($0.44·g–1 [Pyr-EA][NTf2]) and considerable profit ($29.72·g–1 [Pyr-EA][NTf2]) confirmed that [Pyr-EA][NTf2] is a promising prospect for sustainable recovery of gold from e-waste.

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