Rhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters

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dc.contributor.authorQuijada-Maldonado, Esteban
dc.contributor.authorRoman, Rodrigo
dc.contributor.authorMerlet, Gaston
dc.contributor.authorPerez, Barbara
dc.contributor.authorCabezas, Rene
dc.contributor.authorTapia, Ricardo
dc.contributor.authorOlea, Felipe
dc.contributor.authorVillarroel, Eduardo
dc.contributor.authorAraya-Lopez, Claudio
dc.contributor.authorRomero, Julio
dc.date.accessioned2025-01-20T22:01:17Z
dc.date.available2025-01-20T22:01:17Z
dc.date.issued2022
dc.description.abstractBACKGROUND Rhenium(Re) is a highly valuable metal recovered from molybdenite leach liquors by solvent extraction (SX) using toxic organic solvents. This work proposes an extracting phase free of volatile organics composed by the ionic liquid (IL) trioctylmethylammonium benzoate [TOMA][BA] as the extractant, due to its ability to extract Re(VII), and the IL 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [omim][Tf2N] as the diluent, due to its high hydrophobicity where the extraction stoichiometry and process parameters such as the initial pH, the extractant concentration in the diluent and stripping using ammonium hydroxide (NH4OH) and sodium hydroxide (NaOH) were assessed. RESULTS This extracting phase yielded high extraction percentages: 95% with only 3% (v/v) of [TOMA][BA] in [omim][Tf2N]. A detailed study of the SX stoichiometry was carried out through slope analysis, showing that the SX occurs in two steps: first, the extraction of acid; then, the extraction of the metal ion via anion exchange with the transfer of IL-diluent anion to the aqueous phase. Additionally, the extracting phase was tested in a synthetic molybdenite leached pregnant leach solution, showing selectivity towards Re(VII) over Cu(II) and Fe(III) at very low extractant concentration. The stripping of Re(VII) from the loaded phase was also studied achieving 60% stripping in only one equilibrium step when using NH4OH. CONCLUSION This novel extracting phase, free of volatile organic, shows promising Re(VII) extraction for future industrial applications. (c) 2021 Society of Chemical Industry (SCI).
dc.fuente.origenWOS
dc.identifier.doi10.1002/jctb.7013
dc.identifier.eissn1097-4660
dc.identifier.issn0268-2575
dc.identifier.urihttps://doi.org/10.1002/jctb.7013
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93804
dc.identifier.wosidWOS:000738074400001
dc.issue.numero5
dc.language.isoen
dc.pagina.final1233
dc.pagina.inicio1224
dc.revistaJournal of chemical technology and biotechnology
dc.rightsacceso restringido
dc.subjectliquid-liquid extraction
dc.subjecthydrometallurgy
dc.subjectmetals
dc.subjectseparation
dc.subject.ods12 Responsible Consumption and Production
dc.subject.odspa12 Producción y consumo responsable
dc.titleRhenium(VII) extraction from sulfuric aqueous solutions using ionic liquids as diluent and extractant: insights on the extraction stoichiometry and process parameters
dc.typeartículo
dc.volumen97
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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