Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/22445

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dc.contributor.authorCaparrós Vásquez, Cristina Maria-
dc.contributor.authorBenelmekki, M.-
dc.contributor.authorMartins, P.-
dc.contributor.authorXuriguera, E.-
dc.contributor.authorSilva, Carlos J. R.-
dc.contributor.authorMartínez, Ll.-
dc.contributor.authorLanceros-Méndez, S.-
dc.date.accessioned2013-01-09T16:26:18Z-
dc.date.available2013-01-09T16:26:18Z-
dc.date.issued2012-05-06-
dc.identifier.issn0254-0584por
dc.identifier.urihttp://hdl.handle.net/1822/22445-
dc.description.abstractPorous Magnetic Silica (PMS) spheres of about 400 nm diameter were synthesised by one-pot process using the classical Stӧber method combined with hydrothermal treatment. Maghemite nanoparticles (γ-Fe2O3) were used as fillers and cetyltrimethylammonium bromide (CTAB) was used as templating agent. The application of the hydrothermal process (120 °C during 48 h) before the calcination leads to the formation of homogeneous and narrow size distribution PMS spheres. X-ray diffraction patterns (XRD), Infrared measurements (FTIR) and Transmission Electron microscopy (TEM) methods were used to determine the composition and morphology of the obtained PMS spheres. The results show a homogeneous distribution of the γ-Fe2O3 nanoparticles in the silica matrix with a “hollow-like” morphology. Magnetophoresis measurements at 60 T m−1 show a total separation time of the PMS spheres suspension of about 16 min. By using this synthesis method, the limitation of the formation of silica spheres without incorporation of magnetic nanoparticles is overcome. These achievements make this procedure interesting for industrial up scaling. The obtained PMS spheres were evaluated as adsorbents for Ni2+ in aqueous solution. Their adsorption capacity was compared with the adsorption capacity of magnetic silica spheres obtained without hydrothermal treatment before calcination process. PMS spheres show an increase of the adsorption capacity of about 15% of the initial dissolution of Ni2+ without the need to functionalize the silica surface.por
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)por
dc.language.isoengpor
dc.publisherElsevierpor
dc.rightsrestrictedAccesspor
dc.subjectMagnetic structurespor
dc.subjectNanostructurespor
dc.subjectSurface propertiespor
dc.subjectAdsorptionpor
dc.titleHydrothermal assisted synthesis of iron oxide-based magnetic silica spheres and their performance in magnetophoretic water purificationpor
dc.typearticlepor
dc.peerreviewedyespor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S0254058412004634#por
sdum.publicationstatuspublishedpor
oaire.citationStartPage510por
oaire.citationEndPage517por
oaire.citationIssue2/3por
oaire.citationTitleMaterials Chemistry and Physicspor
oaire.citationVolume135por
dc.identifier.doi10.1016/j.matchemphys.2012.05.016por
dc.subject.wosScience & Technologypor
sdum.journalMaterials Chemistry and Physicspor
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