Abstract
This work presents the possibility to use pseudo-protic ionic liquids (PPILs) in the extraction of indium, neodymium, yttrium, and lanthanum from aqueous phases. These metals are relevant for urban mining and can be found in the waste of electrical and electronic equipment. Four different PPILs were used: trihexylammonium octanoate, trioctylammonium myristate, trioctylammonium benzoate, and triocytlammonium cyclohexanoate. All of these four PPILs incorporate a readily available anion, in some cases from natural sources. This can lower the price of the PPIL, thereby generating a possible economic advantage over other ILs. Trihexylammonium octanoate in particular showed high extraction efficiencies for all four metal cations. In general, indium was very well extracted by all four PPILs. Three of the four PPILs can be recycled and reused in subsequent liquid–liquid extractions; only trioctylammonium myristate formed a nonrecyclable emulsion. Recuperation experiments of the metal cations from the PPILs showed that yttrium and neodymium are best recuperated.
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