Dynamics and Heterogeneity of Pb(II) Binding by SiO2 Nanoparticles in an Aqueous Dispersion

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dc.contributor.authorGoveia, Danielle [UNESP]
dc.contributor.authorPinheiro, Jose Paulo
dc.contributor.authorMilkova, Viktoria
dc.contributor.authorRosa, Andre Henrique [UNESP]
dc.contributor.authorvan Leeuwen, Herman P.
dc.contributor.institutionWageningen Univ
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T13:12:12Z
dc.date.available2014-05-20T13:12:12Z
dc.date.issued2011-06-21
dc.description.abstractPb(II) binding by SiO2 nanoparticles in an aqueous dispersion was investigated under conditions where the concentrations of Pb2+ 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 = 0.1 M to 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 Pb2+/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.en
dc.description.affiliationWageningen Univ, Lab Phys Chem & Colloid Sci, Wageningen, Netherlands
dc.description.affiliationUNESP, Dept Engn Ambiental, Sorocaba, SP, Brazil
dc.description.affiliationUNESP, Inst Quim Araraquara, Araraquara, SP, Brazil
dc.description.affiliationUnespUNESP, Dept Engn Ambiental, Sorocaba, SP, Brazil
dc.description.affiliationUnespUNESP, Inst Quim Araraquara, Araraquara, SP, Brazil
dc.description.sponsorshipEuropean Commission
dc.description.sponsorshipresearch center CBME/IBB, LA
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdEuropean Commission: 229244
dc.description.sponsorshipIdEuropean Commission: 244405
dc.description.sponsorshipIdresearch center CBME/IBB, LA: BSAB-855
dc.format.extent7877-7883
dc.identifierhttp://dx.doi.org/10.1021/la2008182
dc.identifier.citationLangmuir. Washington: Amer Chemical Soc, v. 27, n. 12, p. 7877-7883, 2011.
dc.identifier.doi10.1021/la2008182
dc.identifier.issn0743-7463
dc.identifier.orcid0000-0002-2042-018X
dc.identifier.urihttp://hdl.handle.net/11449/196
dc.identifier.wosWOS:000291500700070
dc.language.isoeng
dc.publisherAmer Chemical Soc
dc.relation.ispartofLangmuir
dc.relation.ispartofjcr3.789
dc.relation.ispartofsjr1,479
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleDynamics and Heterogeneity of Pb(II) Binding by SiO2 Nanoparticles in an Aqueous Dispersionen
dc.typeArtigo
dcterms.licensehttp://pubs.acs.org/page/copyright/index.html
dcterms.rightsHolderAmer Chemical Soc
unesp.author.lattes5228846314663888[4]
unesp.author.orcid0000-0002-2042-018X[4]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Ciência e Tecnologia, Sorocabapt

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