The study of a membrane for extracting gold(III) from hydrochloric acid solutions

Solid-Phase Extraction of Cobalt(II) from Lithium Chloride Solutions Using a Poly(vinyl chloride)-based Polymer Inclusion Membrane with Aliquat 336 as the Carrier

“…15 Solid-phase extraction using PIMs has been proposed for separating various metal ions, such as chromium(VI), 16,17 copper(II), [18][19][20] cadmium(II), [18][19][20] palladium(II) 21 and gold(III). [22][23][24] A PVC-based PIM with Aliquat 336 as the carrier has been found to effectively extract cobalt(II) from 7 mol L -1 hydrochloric acid solutions 25 by the same mechanism as in liquid-liquid extraction. 5 However, the use of hydrochloric acid at high concentrations is not desirable because of its corrosiveness.…”

Solvent extraction of gold using ionic liquid based process

“…Futhermore, another IL like Cyphos IL-101 (tetraalkylphosphonium chloride) is also has the potential to separate gold, because it has a stronger affinity for Au(III) than another metal ions viz. Pd(II), Zn (II), and Pt(IV) based on the competition effect (in large excess of the competitor metal) [77][78][79] . Consequently, liquid-liquid extraction that use Cyphos IL-101 has made the separation occurred consistent, gold is adsorbed on the Cyphos IL-101 through the stoichiometric interaction of R3R'P + with AuCl4 -, therefore recovery % the extraction efficiency of Au is high, in quantitative extraction (>99%) can be achieved, because 90% or even 95% is not considered sufficient for gold extraction.…”

“…Consequently, liquid-liquid extraction that use Cyphos IL-101 has made the separation occurred consistent, gold is adsorbed on the Cyphos IL-101 through the stoichiometric interaction of R3R'P + with AuCl4 -, therefore recovery % the extraction efficiency of Au is high, in quantitative extraction (>99%) can be achieved, because 90% or even 95% is not considered sufficient for gold extraction. [77][78][79] . Accordingly, modified approach of IL structure is needed to improve the performance in gold separation.…”

“…Au has similar properties such as has ion charge is 2+ in aqueous condition as like as other ion metals such as Cu, Ag, Zn, and Pd, so that one of the most important task is to separate the ions from one another. Researchers should pay attention of the solubility of each ion metals in water 69,77,81,85 . Since Au ions has good solubility in water or polar solvent, a solvent with high hydrophobicity is needed to seperate Au from ions metal mixture 65,70,87 .…”

Quaternary Ammonium and Phosphonium Ionic Liquids in Chemical and Environmental Engineering

“…Until now, predominantly Aliquat ® 336 has been evaluated as carrier for the extraction of different metal species (e.g. Au(III) (Argiropoulos et al, 1998a), Cd(II), Cu(II) (Wang et al, 2000), Co(II) (Blitz-Raith et al, 2007), Pd(II) , and Zn(II) (Juang et al, 2004) . The investigated IL exhibited high selectivity towards cadmium in the presence of naturally occurring alkali and earth alkali metals (K + , Na + , Ca 2+ , and Mg 2+ ).…”