Mechanistic investigation of facilitated transport of gold(III) from HCl media using ionic liquid Cyphos IL102 as carrier across a supported liquid membrane

Alguacil, F. J.

doi:10.1007/s13404-019-00262-0

Cited by 14 publications

(14 citation statements)

References 42 publications

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“…The overall mass transfer coefficient increased from 600 to 1000 min −1 , thus, indicates that there is a continuous decrease of the feed boundary layer thickness with the increase of the stirring speed and that a minimum in this thickness is reached about 1000 min −1 . The maximum value of the overall mass transfer coefficient is in the same range as that found in other systems using ionic liquids as carriers for gold(III) transport [ 23 , 24 , 25 ]…”

Section: Resultssupporting

confidence: 74%

“…Very often, the recovery of gold from these wastes is done by leaching of the waste with aqua regia, resulting in a leachate in which gold is present as AuCl 4 − or HAuCl 4 [ 5 ]. The recovery of this precious metal from the HCl solution can be done mainly by activated carbon [ 6 ], ion exchange resins [ 7 , 8 , 9 , 10 ], liquid-liquid extraction using conventional [ 11 , 12 , 13 ] and ionic liquid [ 14 , 15 , 16 , 17 ] extractants, different adsorbents [ 18 , 19 , 20 , 21 , 22 ], and as mentioned above by liquid membranes [ 23 , 24 , 25 , 26 ]; more recently, the use of carbon nanotubes have been also considered in the treatment of diluting Au(III)-bearing HCl solutions [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

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Transport of Au(III) from HCl Medium across a Liquid Membrane Using R3NH+Cl−/Toluene Immobilized on a Microporous Hydrophobic Support: Optimization and Modelling

2020

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By the use of the tertiary amine A327 and 1 M HCl solution as precursors, the ionic liquid A327H+Cl− was generated and used to investigate its performance in the transport of Au(III) from hydrochloric acid medium. The influence of the stirring speed (600–1800 min−1), ionic liquid concentration (1.25–50% v/v) in the membrane phase, and gold concentration (0.01–0.15 g/L) in the feed phase on metal transport have been investigated. An equation which included both equilibrium and kinetics parameters was derived, and the membrane diffusional resistance (Δm) and feed phase diffusional resistance (Δf) was estimated as 9.5 × 106 s/cm and 307 s/cm, respectively. At carrier concentrations in the 5–50% v/v range and gold concentrations in the 0.01–0.15 g/L range, metal transport is controlled by diffusion of metal species through the feed boundary layer, whereas at the lowest carrier concentrations, membrane diffusion is predominant. From the receiving solutions, gold can be recovered as gold nanoparticles.

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Section: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Transport of Au(III) from HCl Medium across a Liquid Membrane Using R3NH+Cl−/Toluene Immobilized on a Microporous Hydrophobic Support: Optimization and Modelling

2020

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“…Before scaling up the technology in the form of hollow fiber modules, the investigation of a given system, using supported liquid membrane in flat-sheet configuration, is necessary in order to obtain information about the mass transfer process involved in the membrane operation. One important part, in real terms the key-of-the-operation, is the carrier used to transport the metals, and included in them, ionic liquids are a group of chemicals, which properties make of them to be considered as green solvents, and among other uses [15][16][17][18] suitable for the removal of metals from aqueous solutions [19][20][21][22][23][24][25][26][27][28] .…”

Section: Introductionmentioning

confidence: 99%

Dispersion-Free Extraction of In(III) from HCl Solutions Using a Supported Liquid Membrane Containing HA324H+Cl- Ionic Liquid as Carrier

López¹

2020

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The transport of indium(III), from HCl solutions, across a supported liquid membrane in flat-sheet configuration was investigated, being the carrier the ionic liquid HA324H+Cl- (derived from the tertiary amine Hostarex A324 and hydrochloric acid). Different variables affecting the metal transport: hydrodynamic conditions in the source and receiving phases, metal and HCl concentrations in the source phase, and carrier concentration in the membrane phase, were investigated. Also the transport of indium(III) using carriers of various nature: ionic liquids, alcohol, ketone, phosphine oxide and phosphoric ester, was compared. The metal transport was modelled describing the transport mechanism as: diffusion across the source diffusion layer, a fast interfacial chemical reaction, and diffusion of the InCl4--carrier complex through the membrane support. Diffusional parameters for the transport of indium(III), from the experimental data and the model, were estimated.

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“…Among these residues, the materials generated from the electronic and communication industries are of importance [1,2], because they contained, among other valuable metals, gold. Thus, there is an interest, from worldwide researchers, to investigate methods for the recovery of this precious metal from these residues or, in general, gold-bearing wastes [3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Permeation of AuCl4- across a Liquid Membrane Impregnated with A324H+Cl- Ionic Liquid

López¹

2020

Preprint

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On the system Au(III)-HCl-A324H+Cl-, liquid-liquid extraction experiments were used to define the extraction equilibrium and the corresponding extraction constant, and the facilitated transport of this precious metal, from HCl solutions, across a flat-sheet supported liquid membrane was investigated, using the ionic liquid as carrier, as a function of 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, being their values 241 s/cm an 9730 s/cm, respectively. The performance of the present carrier was compared against results yielded by other ionic liquids, and also it was investigated the influence that other metals had on gold(III) transport both from binary or quaternary solutions. Gold was finally recovered from receiving solutions as zero valent gold nanoparticles.

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Mechanistic investigation of facilitated transport of gold(III) from HCl media using ionic liquid Cyphos IL102 as carrier across a supported liquid membrane

Cited by 14 publications

References 42 publications

Transport of Au(III) from HCl Medium across a Liquid Membrane Using R3NH+Cl−/Toluene Immobilized on a Microporous Hydrophobic Support: Optimization and Modelling

Transport of Au(III) from HCl Medium across a Liquid Membrane Using R3NH+Cl−/Toluene Immobilized on a Microporous Hydrophobic Support: Optimization and Modelling

Dispersion-Free Extraction of In(III) from HCl Solutions Using a Supported Liquid Membrane Containing HA324H+Cl- Ionic Liquid as Carrier

Permeation of AuCl<sub>4</sub><sup>-</sup> across a Liquid Membrane Impregnated with A324H<sup>+</sup>Cl<sup>-</sup> Ionic Liquid

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