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N,N '-dimethyl-N,N '-dicyclohexylsuccinamide: a novel molecule for the separation and recovery of Pd(II) by liquid-liquid extraction

2018Journal article Open access
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dc.contributor.authorCosta, M. Clara
dc.contributor.authorAssunção, Ana
dc.contributor.authorAlmeida, Ruben
dc.contributor.authorCosta, Ana M. Rosa da
dc.contributor.authorNogueira, Carlos
dc.contributor.authorPaiva, A. P.
dc.date.accessioned2018-09-26T15:29:24Z
dc.date.available2018-09-26T15:29:24Z
dc.date.issued2018
dc.description.abstractABSTRACT: N,N'-dimethyl-N,N'-dicyclohexylsuccinamide (DMDCHSA) is investigated as a potential molecule for the liquid-liquid extraction of Pd(II) from chloride solutions for the first time. The effect of several parameters on Pd(II) extraction, such as the contact period between both phases, hydrochloric acid, extractant and hydrogen ion concentrations, is evaluated. Pd(II) extraction equilibrium is very fast (30 s) and the extraction percentage (%E) increases with the HCI concentration in the aqueous phases, being higher than 60% for [HCl] > 5 M. The loading capacity of DMDCHSA for Pd(II) is reasonable (molar ratio extractant/metal higher than 16). Several stripping agents (e.g. distilled water, 1 M HCl, seawater and 20 g/L chloride solution as NaCl) were successfully used to transfer Pd(II) to a new aqueous phase, and data obtained from five successive extraction-stripping cycles suggest a good DMDCHSA stability pattern. Attempts to replace 1,2-dichloroethane (1,2-DCE) by commercial and more environmentally friendly diluents showed much worse %E for Pd(II). Selectivity tests with binary, ternary and more complex metal ion solutions were carried out to evaluate the performance of DMDCHSA towards Pd(II) recovery from 6 M HCl, when in presence of Pt(IV), Fe(III), Zn(II), Al(III) and Ce(III), metal ions usually present in solutions that may result from the hydrometallurgical treatment of spent automobile catalytic converters. It was generally observed that the additional metal ions do not affect the recovery of Pd(II) by DMDCHSA, although Fe(III) and Pt(IV) were co-extracted in a great extent. A solvent extraction (SX) scheme is proposed, based on a previous separation of Fe(III) with tributylphosphate (TBP) and on the selective and sequential stripping of Pt(IV) and Pd(II) from the loaded DMDCHSA with 0.01 M thiourea in 0.5 M HCI and seawater, respectively. The dependence of the Pd(II) distribution ratios on DMDCHSA and acidity, complemented with UV-Visible spectroscopy data, points out to DMDCHSA:Pd(II) extracted species with a 2:1 molar ratio and suggests the occurrence of an outer-sphere ion pair reaction, in which both [PdCl4](2-) and HCI are extracted.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCosta, M. Clara; Assunção, Ana; Almeida, Ruben...[et.al.]. - N,N '-dimethyl-N,N '-dicyclohexylsuccinamide: a novel molecule for the separation and recovery of Pd(II) by liquid-liquid extraction. In: Separation and Purification Technology, 2018, Vol. 201, p. 96-105pt_PT
dc.identifier.issn1383-5866
dc.identifier.urihttp://hdl.handle.net/10400.9/3071
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://doi.org/10.1016/j.seppur.2018.02.050pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectPalladiumpt_PT
dc.subjectLiquid-liquid extractionpt_PT
dc.subjectHydrochloric Acidpt_PT
dc.subjectSolvent extractionpt_PT
dc.subjectPlatinum-group metalspt_PT
dc.titleN,N '-dimethyl-N,N '-dicyclohexylsuccinamide: a novel molecule for the separation and recovery of Pd(II) by liquid-liquid extractionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FQUI-QUI%2F109970%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04326%2F2013/PT
oaire.citation.endPage105pt_PT
oaire.citation.startPage96pt_PT
oaire.citation.titleSeparation and Purification Technologypt_PT
oaire.citation.volume201pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream5876
person.familyNameNogueira
person.familyNamePaiva
person.givenNameCarlos
person.givenNameAna Paula
person.identifier.ciencia-id011E-FCCD-4FA6
person.identifier.ciencia-idAB1D-468B-F3E9
person.identifier.orcid0000-0003-2949-5046
person.identifier.orcid0000-0003-3858-9386
person.identifier.ridA-4926-2013
person.identifier.ridA-2064-2008
person.identifier.scopus-author-id7006686159
person.identifier.scopus-author-id7102683760
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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