Synthesis of temperature-responsive ionic liquids and study on the behavior and mechanism of Au(III) extraction from hydrochloric acid solutions

Wang, Yangyang; Liu, Ronghao; Liu, Xiaoxia; Lv, Panpan; Zhang, Lixin; Yang, Yanzhao

doi:10.1016/j.hydromet.2022.105859

Cited by 2 publications

(4 citation statements)

References 35 publications

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“…In a plane square, there are four Cl atoms on the four symmetry planes of the central metal ion, and there are empty electron orbitals in the central axis direction, which mean the steric hindrance is very small, so [Pyr-EA] + can easily form ion pairs with AuCl 4 – . For the octahedral configuration, six atoms surround the central ion, so the steric hindrance is large, and it is difficult for [Pyr-EA] + to approach the central metal atom. , To sum up, [Pyr-EA][NTf 2 ] showed excellent selectivity for the extraction of Au(III).…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

“…For the octahedral configuration, six atoms surround the central ion, so the steric hindrance is large, and it is difficult for [Pyr-EA] + to approach the central metal atom. 43,44 To sum up, [Pyr-EA][NTf 2 ] showed excellent selectivity for the extraction of Au(III).…”

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

confidence: 99%

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.

Self Cite

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“…IL-based thermomorphic systems have been studied by Wang and coauthors for precious metals separation [45,46]. UCST (upper critical solution temperature)-type [45].…”

Section: Ils As Extractantsmentioning

confidence: 99%

“…UCST (upper critical solution temperature)-type [45]. Ethyl chloroacetate N,N,N′,N′-tetramethyl-ethylenediamine-based IL [EA-TMEDA][Tf 2 N] 2 with temperature-responsive behavior revealed the high selectivity toward gold ions in the hydrochloric acid multicomponent solutions [46].…”

Section: Ils As Extractantsmentioning

confidence: 99%

Alternative Extraction Systems for Precious Metals Recovery: Aqueous Biphasic Systems, Ionic Liquids, Deep Eutectic Solvents

Mokhodoeva

2024

Extraction Metallurgy - New Perspectives

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The current trend in the development of separation methodologies implies their evolution in an environmentally friendly perspective, more precisely, the transition to techniques, materials, and solvents that could be qualified as greener alternatives to conventional ones. The green extraction systems can be attributed to aqueous biphasic systems, ionic liquids, and deep eutectic solvents, which have been widely used recently for various analytical, synthetic, and industrial tasks. In this chapter, the features of the listed systems are discussed in relation to the extraction of precious metals, mainly platinum, palladium, and gold; the examples of the alternative extraction systems for separation and preconcentration of precious metals are reviewed.

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Synthesis of temperature-responsive ionic liquids and study on the behavior and mechanism of Au(III) extraction from hydrochloric acid solutions

Cited by 2 publications

References 35 publications

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

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

Alternative Extraction Systems for Precious Metals Recovery: Aqueous Biphasic Systems, Ionic Liquids, Deep Eutectic Solvents

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