Copper extraction using protic ionic liquids: Evidence of the Hofmeister effect

Extraction of Rare Earth Metal Ions with an Undiluted Hydrophobic Pseudoprotic Ionic Liquid

“…Sodium nitrate was more effective for the extractability than sodium chloridebecause nitrate anion has a more chaotropic character than chloride anion. This result is consistent with the extractions of copper with a pseudoprotic ionic liquid [14] and of rare earth metals with a bifunctional ionic liquid extractant [11]. The Nd and nitrate in the ionic liquid (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) was reported to form much stronger complexes [21].…”

“…Recently, interest has focused on hydrophobic protic ionic liquid, which can be simply prepared by mixing amine and acid, as an extractant. Palladium, platinum, and gallium extraction with protic ionic liquid, trioctylammonium nitrate, diluted in trioctylammonium bis(trifluoromethanesulfonyl)amide [TOAH][NTf 2 ] [12,13], copper extraction with protic ionic liquids composed of alkylamine and aliphatic carboxylic acid [14], and neodymium extraction with protic ionic liquid composed of Primene 81-R (primary amine) and CYANEX 572 (organophosphorus acidic compound) diluted in kerosene [15] have been reported. However, the equimolar mixtures of acids and bases has properties suggesting that proton transfer does not occur based on pKa values and other physical measurements [16].…”

Kinetic Study of Copper(II) Simultaneous Extraction/Stripping from Aqueous Solutions by Bulk Liquid Membranes Using Coupled Transport Mechanisms

“…Extraction and stripping efficiencies (98.1% and 96.1%, respectively) obtained with benzoylacetone as a carrier are similar (or higher in some cases) to those described in the literature using the bulk liquid membrane technique with other carriers [25], using other liquid membrane techniques with other carriers [19,20], and using extraction processes [8,28,29].…”

Towards an environmentally and economically sustainable biorefinery: heavy metal contaminated waste wood as a low-cost feedstock in a low-cost ionic liquid process

“…29 32 The present study looks at the opportunity of using a negative-cost feedstock combined with a low-cost recyclable solvent as a potentially economically and environmentally sustainable way of producing bio-renewable chemicals and fuels. Its previously shown high effectiveness makes the ionoSolv process a promising candidate for tackling this waste disposal problem, as it has been reported to be suitable for various feedstocks including softwoods, and we hypothesised that this could be combined with numerous accounts of ILs' ability to leach 33,34 and extract metals [35][36][37] and the possibility to recover the dissolved metals via electrodeposition. 25,38…”