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Dynamics and heterogeneity of Pb(II) binding by SiO 2 nanoparticles in an aqueous dispersion

dc.contributor.authorGoveia, D.
dc.contributor.authorPinheiro, J. P.
dc.contributor.authorMilkova, V.
dc.contributor.authorRosa, A. H.
dc.contributor.authorVan Leeuwen, H. P.
dc.date.accessioned2013-12-12T15:22:54Z
dc.date.available2013-12-12T15:22:54Z
dc.date.issued2011
dc.date.updated2013-11-26T16:13:50Z
dc.description.abstractABSTRACT: Pb(II) binding by SiO2 nanoparticles in an aqueous dispersion was investigated under conditions where the concentrations of Pb2þ ions and nanoparticles are of similar magnitude. Conditional stability constants (log K) obtained at different values of pH and ionic strength varied from 4.4 at pH 5.5 and I = 0.1Mto 6.4 at pH 6.5 and I = 0.0015 M. In the range of metal to nanoparticle ratios from 1.6 to 0.3, log K strongly increases, which is shown to be due to heterogeneity in Pb(II) binding. For an ionic strength of 0.1 M the Pb2þ/SiO2 nanoparticle system is labile, whereas for lower ionic strengths there is loss of lability with increasing pH and decreasing ionic strength. Theoretical calculations on the basis of Eigen-type complex formation kinetics seem to support the loss of lability. This is related to the nanoparticulate nature of the system, where complexation rate constants become increasingly diffusion controlled. The ion binding heterogeneity and chemodynamics of oxidic nanoparticles clearly need further detailed research.por
dc.identifier.citationGoveia, D.; Pinheiro, J. P.; Milkova, V.; Rosa, A. H.; Van Leeuwen, H. P. Dynamics and heterogeneity of Pb(II) binding by SiO 2 nanoparticles in an aqueous dispersion, Langmuir, 27, 12, 7877-78, 2011.por
dc.identifier.doihttp://dx.doi.org/10.1021/la2008182
dc.identifier.issn0743-7463
dc.identifier.otherAUT: JPI01020;
dc.identifier.urihttp://hdl.handle.net/10400.1/3240
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmerican Chemical Societypor
dc.relationBiosensor nanoarrays for environmental monitoring
dc.titleDynamics and heterogeneity of Pb(II) binding by SiO 2 nanoparticles in an aqueous dispersionpor
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleBiosensor nanoarrays for environmental monitoring
oaire.awardURIinfo:eu-repo/grantAgreement/EC/FP7/244405/EU
oaire.citation.endPage7883por
oaire.citation.issue12por
oaire.citation.startPage7877por
oaire.citation.titleLangmuirpor
oaire.citation.volume27por
oaire.fundingStreamFP7
person.familyNamePinheiro
person.givenNameJosé Paulo
person.identifier.orcid0000-0001-7925-9733
person.identifier.ridE-8402-2013
person.identifier.scopus-author-id35838299700
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.nameEuropean Commission
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication5caedbac-d2b5-4a86-91a7-083bf83edda3
relation.isAuthorOfPublication.latestForDiscovery5caedbac-d2b5-4a86-91a7-083bf83edda3
relation.isProjectOfPublicationa21c505f-981a-4780-803b-528cfc1a260b
relation.isProjectOfPublication.latestForDiscoverya21c505f-981a-4780-803b-528cfc1a260b

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