Improving the selective extraction of lanthanides by using functionalised ionic liquids

Maria, Leonor; Cruz, António João; Carretas, José M.; Monteiro, Bernardo; Galinha, Catarina; Gomes, Susana Sousa; Araújo, M. Fátima; Paiva, Isabel; Marçalo, Joaquim; Leal, João Paulo

doi:10.1016/j.seppur.2019.116354

Cited by 37 publications

(20 citation statements)

References 51 publications

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“…From the types of organic extractants, ionic liquids constitute a subcategory also of current interest, due to the special characteristics that these reagents present, which somewhat allows them to be referred to as green solvents. These ionic liquids are used in different fields [9][10][11][12] including the removal of metals from aqueous solutions [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Permeation of AuCl4− Across a Liquid Membrane Impregnated with A324H+Cl− Ionic Liquid

López

2020

Metals

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In the system Au(III)-HCl-A324H+Cl−, liquid-liquid extraction experiments were used to define the extraction equilibrium and the corresponding extraction constant; furthermore, the facilitated transport of this precious metal from HCl solutions across a flat-sheet supported liquid membrane was investigated using the same ionic liquid as a carrier, and as a function of different variables: hydrodynamic conditions, concentration of gold(III) (0.01–0.1 g/L), and HCl (0.5–6 M) in the feed phase, and carrier concentration (0.023–0.92 M) in the membrane. An uphill transport equation was derived considering aqueous feed boundary layer diffusion and membrane diffusion as controlling steps. The aqueous diffusional resistance (Δf) and the membrane diffusional resistance (Δm) were estimated from the proposed equation with values of 241 s/cm and 9730 s/cm, respectively. The performance of the present carrier was compared against results yielded by other ionic liquids, and the influence that other metals had on gold(III) transport from both binary or quaternary solutions was also investigated. Gold was finally recovered from receiving solutions as zero valent gold nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Permeation of AuCl4− Across a Liquid Membrane Impregnated with A324H+Cl− Ionic Liquid

López

2020

Metals

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“…Due to these properties, these liquids are considered to be green solvents. Ionic liquids are used in several Processes 2021, 9, 608 2 of 13 fields, e.g., biochemistry [24], electrochemistry [25], pharmaceutics [26,27], and analytical chemistry [28], and in the recovery of metals, with recent applications discussed in the literature including base metals [29][30][31], rare earths [32][33][34], indium [35,36], gold [37,38], and others [39,40].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Liquid–Liquid Extraction System AuCl4−/HCl/A327H+Cl− Ionic Liquid/Toluene

López

2021

Processes

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The ionic liquid A327H+Cl− is generated by reaction of the tertiary amine A327 (industrial mixture of tri-octyl and tri-decyl amines) and hydrochloric acid solutions. In this study, the extraction of Au(III) by A327H+Cl− ionic liquid under various variables, including metal and ionic liquid concentrations, was investigated. Results indicate that A327H+AuCl4− is formed by an exothermic (ΔH° = −3 kJ/mol) reaction in the organic solution. Aqueous ionic strength influences the formation constant values, and the specific interaction theory (SIT) was used to estimate the interaction coefficient between AuCl4− and H+. Gold (III) was stripped using thiocyanate media, and from the strip solutions, gold was precipitated as gold nanoparticles.

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“…Ionic liquids had been amply used, in the recovery of metals, being some recent applications given in the literature, i.e. base metals [15][16][17], rare earths [18][19][20], indium [21,22], gold [23,24] and others [25,26].…”

Section: Introductionmentioning

confidence: 99%

Insight the Liquid-Liquid Extraction System AuCl4-/HCl/A327H+Cl- Ionic Liquid/Toluene

López¹

2021

Preprint

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The ionic liquid A327H+Cl- is generated by reaction of the tertiary amine A327 (industrial mixture of tri-octil and tri-decyl amines) and hydrochloric acid solutions. Further, the extraction of Au(III) by A327H+Cl- ionic liquid under various variables, including metal and ionic liquid concentrations, has been investigated. Results indicate that A327H+AuCl4- is formed, by an exothermic (ΔHº= -3 kJ/mol) reaction, in the organic solution. Aqueous ionic strength influences the formation constants values and the specific interaction theory (SIT) is used to estimate the interaction coefficient between AuCl4- and H+. Gold (III) is stripped using thiocyanate media, and from the strip solutions, gold is precipitated as gold nanoparticles.

show abstract

Improving the selective extraction of lanthanides by using functionalised ionic liquids

Cited by 37 publications

References 51 publications

Permeation of AuCl4− Across a Liquid Membrane Impregnated with A324H+Cl− Ionic Liquid

Permeation of AuCl4− Across a Liquid Membrane Impregnated with A324H+Cl− Ionic Liquid

Insight into the Liquid–Liquid Extraction System AuCl4−/HCl/A327H+Cl− Ionic Liquid/Toluene

Insight the Liquid-Liquid Extraction System AuCl4-/HCl/A327H+Cl- Ionic Liquid/Toluene

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