Physicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediation

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dc.contributor.authorStathi, P.en
dc.contributor.authorLitina, K.en
dc.contributor.authorGournis, D.en
dc.contributor.authorGiannopoulos, T. S.en
dc.contributor.authorDeligiannakis, Y.en
dc.date.accessioned2015-11-24T17:37:18Z
dc.date.available2015-11-24T17:37:18Z
dc.identifier.issn0021-9797-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/14339
dc.rightsDefault Licence-
dc.subjectorganoclayen
dc.subjectmontmorilloniteen
dc.subjectswyen
dc.subjectheavy metalen
dc.subjectenvironmental remediationen
dc.subjectscmen
dc.subjectsurface chargeen
dc.subjectcden
dc.subjectpben
dc.subjectznen
dc.subjectfiteqlen
dc.subjectacid-base chemistryen
dc.subjectadsorptionen
dc.subjectmontmorilloniteen
dc.subjectclayen
dc.subjectsorptionen
dc.subjectsurfaceen
dc.subjectdithiocarbamateen
dc.subjectnanocompositesen
dc.subjecttitrationen
dc.subjectmineralsen
dc.titlePhysicochemical study of novel organoclays as heavy metal ion adsorbents for environmental remediationen
heal.abstractFour organic-modified clays based on a SWy-2 montmorillonite were prepared by embedding ammonium organic derivatives with different chelating functionalities (-NH2, -COOH, -SH or -CS2) in the interlayer space of montmorillonite. Organic molecules such as (a) hexamethylenediamine, (b) 2-(dimethylamino)ethenethiol, (c) 5-aminovaleric acid and (d) hexamethylenediamine-dithiocarbamate were used for the clay modification in order to study the effect of the chelating functionality on heavy metal ions binding from aqueous solutions. The organoclays were characterized by powder X-ray diffraction (XRD), infrared (FTIR) and NMR spectroscopies. The experimental data showed that the organic molecules are intercalated into the interlamelar space with the long dimension parallel to the clay sheets. Their sorbing properties were evaluated for the removal of heavy metals, Pb, Cd and Zn, from aqueous solutions as a function of the pH. When compared with the unmodified SWy-2 montmorillonite, the modified clays show significant improvement in terms of sorbing selectivity as well as of metal loading capacity. The fit to adsorption data by a Surface Complexation Model shows that the intercalated molecules act as specific binding sites in the clay. These contribute additional sorption capacity which is additive to the variable charge edge-sites of the clay in competition with the permanent charge sites. (C) 2007 Elsevier Inc. All rights reserved.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.primaryDOI 10.1016/j.jcis.2007.07.078-
heal.identifier.secondary<Go to ISI>://000250987500012-
heal.journalNameJ Colloid Interface Scien
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2007-
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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