Activation process of air stable nanoscale zero-valent iron particles

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dc.contributor.authorČerník Miroslavcs
dc.contributor.authorRibas Davidcs
dc.contributor.authorBenito Jósecs
dc.contributor.authorFilip Jancs
dc.contributor.authorMarti Vicenscs
dc.date.accessioned2018-09-25T12:13:44Z
dc.date.available2018-09-25T12:13:44Z
dc.date.issued2017cs
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.en
dc.format.extent10cs
dc.identifier.doi10.1016/j.cej.2017.03.056
dc.identifier.issn1385-8947cs
dc.identifier.urihttps://dspace.tul.cz/handle/15240/31150
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S1385894717304163?via%3Dihub
dc.language.isoengcs
dc.publisherELSEVIER SCIENCE SAcs
dc.publisher.cityLAUSANNEcs
dc.relation.ispartofseries0cs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1385894717304163cs
dc.subjectZEROVALENT IRONcs
dc.subjectAQUEOUS-SOLUTIONcs
dc.subjectTCE DECHLORINATIONcs
dc.subjectBOROHYDRIDE REDUCTIONcs
dc.subjectCHROMIUM(VI) REMOVALcs
dc.subjectNITRATE REDUCTIONcs
dc.subjectWATER-TREATMENTcs
dc.subjectSUPPORTED NZVIcs
dc.subjectH-2 EVOLUTIONcs
dc.subjectWASTE-WATERcs
dc.titleActivation process of air stable nanoscale zero-valent iron particlesen
dc.titleActivation process of air stable nanoscale zero-valent iron particlescs
local.citation.epage290-299cs
local.citation.spage290-299cs
local.identifier.publikace4608
local.identifier.wok401202200032en
local.relation.issueJULcs
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