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A bridge between liquid-liquid extraction and the use of bacterial communities for palladium and platinum recovery as nanosized metal sulphides

2016-08Journal article Restricted access
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dc.contributor.authorAssunção, Ana
dc.contributor.authorMatos, Ana
dc.contributor.authorCosta, Ana M. Rosa da
dc.contributor.authorCandeias, Antonio
dc.contributor.authorCosta, Maria Clara
dc.date.accessioned2017-04-07T15:56:20Z
dc.date.available2017-04-07T15:56:20Z
dc.date.issued2016-08
dc.description.abstractThe Platinum Group Metals (PGM) are rare in the Earth's crust and in the past years their use had a considerable expansion limiting their availability, which justifies PGM's high commercial value and demand. Therefore, PGM recovery from secondary sources is very important from both economic and environmental points of view. In recent years, several methods for PGM removal have been investigated. Our research group has been studying the removal/recovery of PGM using both chemical (liquid liquid extraction) and biological methods (using anaerobic bacterial communities).The aim of this study was to combine these two chemical and biological approach technologies, for PGM recovery. For that purpose, Pd(II) and Pt(IV) present in aqueous phases, were extracted to organic phases composed by N,N'-dimethyl-N,N'-dicyclohexylsuccinamide (DMDCHSA) and N,N'-dimethyl-N,N'-dicyclohexyltetradecylmalonamide (DMDCHTDMA) in 1,2-dichloroethane, respectively, with an extraction efficiency of 79% for Pd(II) and 99% for Pt(IV). The metals in the loaded organic phases were then stripped with seawater, a low-cost solution largely available in nature, with efficiencies of 100% for Pd and 86% for Pt. Finally, the metals were precipitated and recovered using metabolic products produced by a community enriched for sulphate-reducing bacteria. The palladium precipitated completely, while 86% of platinum was precipitated. During the precipitation process sulphide concentration in the solution decreased and the analysis of the precipitates was consistent with the formation of nanosized PdS and PtS2.To our knowledge, this research shows, for the first time, the potential of combining liquid liquid extraction with the use of bacteria aiming platinum and palladium recovery, as metal sulphides, from aqueous media. (C) 2016 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.hydromet.2016.03.012
dc.identifier.issn0304-386X
dc.identifier.otherAUT: AMC01695;
dc.identifier.urihttp://hdl.handle.net/10400.1/9385
dc.language.isoeng
dc.peerreviewedyes
dc.relation.isbasedonWOS:000378459000006
dc.titleA bridge between liquid-liquid extraction and the use of bacterial communities for palladium and platinum recovery as nanosized metal sulphides
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F77093%2F2011/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAG-TEC%2F2721%2F2012/PT
oaire.citation.endPage48
oaire.citation.startPage40
oaire.citation.titleHydrometallurgy
oaire.citation.volume163
oaire.fundingStreamSFRH
oaire.fundingStream3599-PPCDT
person.familyNameAssunção
person.familyNameRosa da Costa
person.familyNameCosta
person.givenNameAna
person.givenNameAna M
person.givenNameMaria Clara
person.identifier305029
person.identifier.ciencia-idA418-A85E-5DB1
person.identifier.ciencia-id7110-A28E-3C8A
person.identifier.orcid0000-0002-2519-2817
person.identifier.orcid0000-0003-0225-9537
person.identifier.orcid0000-0003-1340-5237
person.identifier.ridE-2165-2012
person.identifier.ridM-6189-2013
person.identifier.scopus-author-id18036433200
person.identifier.scopus-author-id53986075100
person.identifier.scopus-author-id35354952400
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.rightsrestrictedAccess
rcaap.typearticle
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