Efficient extraction of gold(I) from alkaline aurocyanide solution using green ionic liquid-based aqueous biphasic systems

Yang, Xiangjun; Miao, Changlin; Sun, Yan; Lei, Ting; Xie, Qiang; Wang, Shixiong

doi:10.1016/j.jtice.2018.06.018

Cited by 33 publications

(26 citation statements)

References 51 publications

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“…For example, a two-phase system consisting of an ionic liquid ) and potassium hydrogen phosphate (K 2 HPO 4 ) was used to recover gold(I) from alkaline solutions of aurocyanides. The use of this system allowed the recovery of up to 99.9% of gold [68].…”

Section: Noble Metals and Platinum-group Metalsmentioning

confidence: 99%

Ionic Liquids as Components of Systems for Metal Extraction

Yudaev

Chistyakov

2022

ChemEngineering

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This review addresses research and development on the use of ionic liquids as extractants and diluents in the solvent extraction of metals. Primary attention is given to the efficiency and selectivity of metal extraction from industrial wastewater with ionic liquids composed of various cations and anions. The review covers literature sources published in the period of 2010–2021. The bibliography includes 98 references dedicated to research on the extraction and separation of lanthanides (17 sources), actinides (5 sources), heavy metals (35 sources), noble metals, including the platinum group (16 sources), and some other metals.

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Section: Noble Metals and Platinum-group Metalsmentioning

confidence: 99%

Ionic Liquids as Components of Systems for Metal Extraction

Yudaev

Chistyakov

2022

ChemEngineering

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“…However, most of the above methods come with certain disadvantages, such as high consumption of organic solvents, incomplete extraction of metal ions, and the high cost of the chemicals. Today, aqueous two-phase systems (ATPS) based on water-soluble polymers [12] and ionic liquids [13], which are actively studied for the elaboration of the extraction and purification processes of both organic [14] and inorganic substances [15], have a major chance of being put into a practical use. The most widely used systems are those formed by both a polymer and salt or by two polymers (usually by polyethylene glycol and dextran).…”

Section: Introductionmentioning

confidence: 99%

Complex Extraction of Metals in an Aqueous Two-Phase System Based on Poly(Ethylene Oxide) 1500 and Sodium Nitrate

et al. 2019

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This article presents an ecologically safe aqueous two-phase system based on poly(ethylene oxide) with a molecular weight of 1500, designed for complex extraction of Ni(II), Co(II), Fe(III), Mn(II), Zn(II), Cu(II), and Al(III) from nitrate solutions. A kinetic dependence has been investigated for a distribution ratio for the metals examined. The influence of pH-values, temperature, initial metal concentration, and nitric acid content have on the extraction of a wide range of metals in the heterogeneous poly(ethylene oxide) 1500-NaNO3-H2O system has been discovered. As a result, the complex extraction of metals (EMe > 60%) was achieved in one step of extraction without introducing additional chemicals into the system.

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“…53 When the SCN − and PdCl 4 2− anions coexist in aqueous solution, positively charged TMG + tends to combine with SCN − through electrostatic interaction because of its lower surface charge, forming a more stable ion pair based on the theory of minimum surface charge density. 17 Palladium Recovery. The metal palladium was recovered by a one-step reduction method using hydrazine hydrate as the reducing agent.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…16 Yang et al constructed an aqueous biphasic system with an imidazolium IL and phosphate and used it to extract Au(CN) 2 − in alkaline solution. 17 Although ILs have been highly praised as green solvents, ILs have also aroused doubts from researchers. At present, ILs generally contain fluorine and imidazole ions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Xu et al used [C 4 mim]BF 4 and (NH 4 ) 2 SO 4 to generate an IL-ATPS and realized the efficient separation of cigniole glycoside from a crude extract of Cistanchola deserticola . Yang et al constructed an aqueous biphasic system with an imidazolium IL and phosphate and used it to extract Au(CN) 2 – in alkaline solution . Although ILs have been highly praised as green solvents, ILs have also aroused doubts from researchers.…”

Section: Introductionmentioning

confidence: 99%

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A High-Performance Guanidinium-Based Aqueous Biphasic System for Green Separation of Palladium from Acid Solution

Zhu

Huang

et al. 2022

ACS Sustainable Chem. Eng.

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Aqueous biphasic extraction with an ionic liquid is an excellent strategy for separating multiple substances. In this work, a green aqueous two-phase system (ATPS) composed of a guanidinium ionic liquid (GIL) and phosphate was constructed and used to extract palladium from an acidic solution. The influences of important parameters, including the species and concentration of the GIL and salt, initial Pd(II) concentration in solution, reaction time, equilibrium pH, and temperature on the extraction of palladium, were studied. The results show that up to 100% of Pd(II) efficiently migrates from the lower salt-rich phase to the upper GIL-rich phase and that GIL-based ATPSs exhibit excellent selectivity for palladium under the optimal extraction conditions. Thermodynamic studies show that the increase of entropy serves as the main driving force for the migration of Pd(II). Fourier transform infrared, ultraviolet−visible, proton nuclear magnetic resonance, and X-ray photoelectron spectroscopy characterization methods reveal that the electrostatic interaction between the PdCl 4 2− anion and the GIL cation is the main mechanism for the distribution of Pd(II) in the GIL-rich phase. The anionic PdCl 4 2− transfers to the upper phase by anion exchange with the carboxylate anion in the GIL, and the extraction complex is [2TMG + ] • [PdCl 42− ] in the GIL-rich phase. Finally, the palladium can be successfully recovered from the GIL-rich phase through one-step reduction via hydrazine hydrate. The developed guanidinium-based biphasic system is an environmentally friendly system for the efficient recovery of Pd(II) from solutions.

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Efficient extraction of gold(I) from alkaline aurocyanide solution using green ionic liquid-based aqueous biphasic systems

Cited by 33 publications

References 51 publications

Ionic Liquids as Components of Systems for Metal Extraction

Ionic Liquids as Components of Systems for Metal Extraction

Complex Extraction of Metals in an Aqueous Two-Phase System Based on Poly(Ethylene Oxide) 1500 and Sodium Nitrate

A High-Performance Guanidinium-Based Aqueous Biphasic System for Green Separation of Palladium from Acid Solution

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