Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/19447
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dc.contributor.authorCardoso, Simao P.pt
dc.contributor.authorAzenha, Ivo S.pt
dc.contributor.authorLin, Zhipt
dc.contributor.authorPortugal, Inespt
dc.contributor.authorRodrigues, Alirio E.pt
dc.contributor.authorSilva, Carlos M.pt
dc.date.accessioned2017-12-07T19:13:05Z-
dc.date.issued2016pt
dc.identifier.issn1385-8947pt
dc.identifier.urihttp://hdl.handle.net/10773/19447-
dc.description.abstractMicroporous stannosilicate AV-6 was investigated for cadmium(II) removal from aqueous solutions in batch experiments. Ion exchange equilibrium of the Cd2+/K+/AV-6 system was modeled using the mass action law combined with activity coefficient models for the solution (ideal, Debye-Htickel and Pitzer equations) and for the solid (Wilson equation) with absolute average relative deviations (AARDs) between 6.56% and 6.75%. It was concluded that the system embodies strong intraparticle non-idealities, namely solid activity coefficients between 0.2602 and 0.7180 for Cd2+. The kinetics of cadmium(II) sorption was analyzed measuring removal curves and modeling the data with pseudo-first and pseudo-second order expressions, commonly adopted in the literature, and with Maxwell-Stefan (MS) and Nernst-Plank (NP) based models. The best results were achieved by MS and NP approaches, for which AARD was 3.74% and 3.71%, respectively. The kinetic performance of the ion exchange was also discussed taking into account structural aspects of the AV-6 material. (C) 2016 Elsevier B.V. All rights reserved.pt
dc.language.isoengpt
dc.publisherELSEVIER SCIENCE SApt
dc.relationinfo:eu-repo/grantAgreement/FCT/5876/147332/PTpt
dc.relationinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F75164%2F2010/PTpt
dc.rightsrestrictedAccesspor
dc.subjectLANTHANIDE SILICATE EU-AV-20pt
dc.subjectMAXWELL-STEFAN APPROACHpt
dc.subjectEXCESS GIBBS ENERGYpt
dc.subjectTITANOSILICATE ETS-4pt
dc.subjectAQUEOUS-SOLUTIONpt
dc.subjectSTRUCTURAL-CHARACTERIZATIONpt
dc.subjectMASS-TRANSFERpt
dc.subjectMETAL-IONSpt
dc.subjectREMOVALpt
dc.subjectSYSTEMSpt
dc.titleExperimental measurement and modeling of ion exchange equilibrium and kinetics of cadmium(II) solutions over microporous stannosilicate AV-6pt
dc.typearticlept
dc.peerreviewedyespt
ua.distributioninternationalpt
degois.publication.firstPage139pt
degois.publication.lastPage151pt
degois.publication.titleCHEMICAL ENGINEERING JOURNALpt
degois.publication.volume295pt
dc.date.embargo10000-01-01-
dc.relation.publisherversion10.1016/j.cej.2016.03.007pt
dc.identifier.doi10.1016/j.cej.2016.03.007pt
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