Functionalized SiO(2) with N-, S-containing ligands for Pb(II) and Cd(II) adsorption

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dc.contributor.authorGrigoropoulou, G.en
dc.contributor.authorStathi, P.en
dc.contributor.authorKarakassides, M. A.en
dc.contributor.authorLouloudi, M.en
dc.contributor.authorDeligiannakis, Y.en
dc.date.accessioned2015-11-24T17:34:34Z
dc.date.available2015-11-24T17:34:34Z
dc.identifier.issn0927-7757-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/13993
dc.rightsDefault Licence-
dc.subjectmodified sio(2)en
dc.subjectcden
dc.subjectpben
dc.subjectmetal uptakeen
dc.subjectspeciationen
dc.subjectfiteqlen
dc.subjectsurface complexation modelen
dc.subjectft-iren
dc.subjectatomic-absorption-spectrometryen
dc.subjectmodified silica-gelen
dc.subjectheavy-metal ionsen
dc.subjectaqueous-solutionen
dc.subjectthiol functionalityen
dc.subjectmesoporous silicaen
dc.subjectiron-oxideen
dc.subjectsurfaceen
dc.subjectseparationen
dc.subjecthg(ii)en
dc.titleFunctionalized SiO(2) with N-, S-containing ligands for Pb(II) and Cd(II) adsorptionen
heal.abstractFive novel organosilicas SiO(2)-L have been prepared by grafting organic ligands (L) bearing thiazolidine (TAMS), thiazole (TIMS), imidazole (DTIMS), mercaptopropyl (DETATS) or pyridine (DETAPS) functional groups. The SiO(2)-L materials have been evaluated for their capacity for Pb(2+) and Cd(2+) uptake from aqueous solution as a function of the pH. The present data demonstrate that the grafting of the silica may result in significant enhancement of metal uptake by the SiO(2)-L adsorbent. Noticeably, multifunctional ligands such as DTIMS and DETAPS, have exhibited the highest metal capacity between the studied materials. Significant metal uptake was observed for both Pb and Cd on those materials independent of pH. The adsorption data have been analyzed based on a surface complexation model (SCM) with FITEQL by considering the grafted ligands as additional surface sites. FT-IR data are provided in support of this approach. Based on the theoretical speciation results, we may conclude that the determining factors for the metal uptake by the modified silica are the following three: (a) the presence or absence of protonable groups on the ligand determines the pH-edge profile, (b) the complexing affinity of the particular ligand towards each metal, and (c) the amount of grafted ligand on the silica surface. The interplay of these factors will determine the final maximum loading capacity of the sorbing material. Both the nature of the ligand as well as its surface concentration are of equal importance for the sorbing capacity of the material. (C) 2008 Elsevier B.V. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.colsurfa.2008.01.007-
heal.identifier.secondary<Go to ISI>://000256871100005-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0927775708000241/1-s2.0-S0927775708000241-main.pdf?_tid=2163425375823f93c06bdd7f4db13435&acdnat=1339492882_fafe6e54302cb71f06a9dc2d5b224d24-
heal.journalNameColloids and Surfaces a-Physicochemical and Engineering Aspectsen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2008-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικώνel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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