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Investigating the binding heterogeneity of trace metal cations with SiO2 nanoparticles using full wave analysis of stripping chronopotentiometry at scanned deposition potential

2020Journal article Open access
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dc.contributor.authorRotureau, Elise
dc.contributor.authorRocha, Luciana S.
dc.contributor.authorGoveia, Danielle
dc.contributor.authorAlves, Nuno G.
dc.contributor.authorPinheiro, José Paulo
dc.date.accessioned2021-01-21T10:34:50Z
dc.date.available2021-01-21T10:34:50Z
dc.date.issued2020
dc.description.abstractSilica oxides nano- and microparticles, as well as silica-based materials, are very abundant in nature and industrial processes. Trace metal cation binding with these bulk materials is generally not considered significant in speciation studies in environmental systems. Nonetheless, this might change for nanoparticulate systems as observed in a previous study of Pb(II) with a very small SiO2 particle (7.5 nm diameter). Besides, metal binding by those nanoparticles is surprisingly characterized by a heterogeneity that increases with the decrease of metal-to-particle ratio. Therefore, it is interesting to extend this study to investigate different trace metals and the influence of the nanoparticle size on the cation binding heterogeneity. Consequently, the Cd(II), Pb(II), and Zn(II) binding by two different sized SiO2 nanoparticles (Ludox LS30 and TM40) in aqueous dispersion was studied for a range of pH and ionic strength conditions, using the combination of the electroanalytical techniques Scanned Stripping ChronoPotentiometry and Absence of Gradients and Nernstian Equilibrium Stripping. The coupling of these techniques provides the free metal concentration in the bulk (AGNES) and information of the free and complex concentration at the electrode surface for each Stripping Chronopotentiometry at Scanned deposition Potential (SSCP). A recent mathematical treatment allows the reconstruction of a portion of the metal to ligand binding isotherm with the included heterogeneity information using the full SSCP wave analysis. In this work, we observed that the Zn(II) binding is homogeneous, Cd(II) is slightly heterogeneous, and Pb(II) is moderately heterogeneous, whereas the results obtained with the 7.5 nm diameter nanoparticle are slightly more heterogeneous than those obtained with the one of 17 nm. These findings suggest that the Zn(II) binding is electrostatic in nature, and for both Cd(II) and Pb(II), there should be a significant chemical binding contribution.pt_PT
dc.description.sponsorshipFCT-ANR/AAG-MAA/0065/2012pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fchem.2020.614574pt_PT
dc.identifier.issn2296-2646
dc.identifier.urihttp://hdl.handle.net/10400.1/14978
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Mediapt_PT
dc.relationIn situ trace metal speciation monitoring
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectTrace metalpt_PT
dc.subjectBinding heterogeneitypt_PT
dc.subjectSiO2 nanoparticlespt_PT
dc.subjectAGNESpt_PT
dc.subjectSSCPpt_PT
dc.titleInvestigating the binding heterogeneity of trace metal cations with SiO2 nanoparticles using full wave analysis of stripping chronopotentiometry at scanned deposition potentialpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleIn situ trace metal speciation monitoring
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/FCT-ANR%2FAAG-MAA%2F0065%2F2012/PT
oaire.citation.startPage614574pt_PT
oaire.citation.titleFrontiers in Chemistrypt_PT
oaire.citation.volume8pt_PT
oaire.fundingStream3599-PPCDT
person.familyNameRocha
person.familyNamePinheiro
person.givenNameLuciana
person.givenNameJosé Paulo
person.identifier.ciencia-id9415-9C14-C4CD
person.identifier.orcid0000-0002-5469-0911
person.identifier.orcid0000-0001-7925-9733
person.identifier.ridM-2566-2013
person.identifier.ridE-8402-2013
person.identifier.scopus-author-id8041532300
person.identifier.scopus-author-id35838299700
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicatione6ba3128-9b58-449e-a710-d124f6b8b65d
relation.isAuthorOfPublication5caedbac-d2b5-4a86-91a7-083bf83edda3
relation.isAuthorOfPublication.latestForDiscoverye6ba3128-9b58-449e-a710-d124f6b8b65d
relation.isProjectOfPublication9ec89379-1df9-4a4f-aadd-b519804773eb
relation.isProjectOfPublication.latestForDiscovery9ec89379-1df9-4a4f-aadd-b519804773eb

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