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dc.contributor.authorRibas Fargas, David
dc.contributor.authorCernik, M.
dc.contributor.authorBenito Páramo, José Antonio
dc.contributor.authorFilip, J.
dc.contributor.authorMartí Gregorio, Vicenç
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.date.accessioned2017-05-12T08:09:25Z
dc.date.available2017-05-12T08:09:25Z
dc.date.issued2017-07-15
dc.identifier.citationRibas, D., Cernik, M., Benito, J., Filip, J., Martí, V. Activation process of air stable nanoscale zero-valent iron particles. "Chemical engineering journal", 15 Juliol 2017, vol. 320, p. 290-299.
dc.identifier.issn1385-8947
dc.identifier.urihttp://hdl.handle.net/2117/104346
dc.description.abstractNanoscale Zero Valent Iron (nZVI) represents a promising material for subsurface water remediation technology. However, dry, bare nZVI particles are highly reactive, being pyrophoric when they are in contact with air. The current trends of nZVI manufacturing lead to the surface passivation of dry nZVI particles with a thin oxide layer, which entails a decrease in their reactivity. In this work an activation procedure to recover the reactivity of air-stable nZVI particles is presented. The method consists of exposing nZVI to water for 36 h just before the reaction with the pollutants. To assess the increase in nZVI reactivity based on the activation procedure, three types of nZVI particles with different oxide shell thicknesses have been tested for Cr(VI) removal. The two types of air-stable nZVI particles with an oxide shell thickness of around 3.4 and 6.5 nm increased their reactivity by a factor of 4.7 and 3.4 after activation, respectively. However, the pyrophoric nZVI particles displayed no significant improvement in reactivity. The improvement in reactivity is related mainly to the degradation of the oxide shell, which enhances electron transfer and leads secondarily to an increase in the specific surface area of the nZVI after the activation process. In order to validate the activation process, additional tests with selected chlorinated compounds demonstrated an increase in the degradation rate by activated nZVI particles.
dc.format.extent10 p.
dc.language.isoeng
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials
dc.subjectÀrees temàtiques de la UPC::Enginyeria química
dc.subject.lcshReactivity (Chemistry)
dc.subject.lcshAging
dc.subject.lcshOxides
dc.subject.otherNanoscale zero-valent iron (nZVI)
dc.subject.otherReactivity
dc.subject.otherCr(VI) remediation
dc.subject.otherAging
dc.subject.otherOxide layer
dc.titleActivation process of air stable nanoscale zero-valent iron particles
dc.typeArticle
dc.subject.lemacReactivitat (Química)
dc.subject.lemacÒxids
dc.contributor.groupUniversitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
dc.contributor.groupUniversitat Politècnica de Catalunya. PROCOMAME - Processos de Conformació de Materials Metàl·lics
dc.identifier.doi10.1016/j.cej.2017.03.056
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1385894717304163
dc.rights.accessOpen Access
local.identifier.drac19857803
dc.description.versionPostprint (author's final draft)
local.citation.authorRibas, D.; Cernik, M.; Benito, J.; Filip, J.; Martí, V.
local.citation.publicationNameChemical engineering journal
local.citation.volume320
local.citation.startingPage290
local.citation.endingPage299


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