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Statements

Subject Item
n2:RIV%2F60461373%3A22320%2F12%3A43893800%21RIV13-MSM-22320___
rdf:type
skos:Concept n17:Vysledek
dcterms:description
We studied the degradation of different chlorinated ethylenes by silica coated nanoscale zerovalent iron particles nZVI. The silica coated nZVI has improved stability for its subsurface migration and can accelerate the degradation of studied contaminants. The reactivity of studied silica coated nZVI was compared to the uncoated nZVI and microscale zerovalent iron particles. To form the silica coating, the uncoated nanoiron particles in an aqueous suspension were modified by Stöber synthesis using tetraethylorthosilicate (TEOS). Lab-scale degradation experiments were performed in serum bottles containing a mixture of chlorinated ethylenes (? 5 mg.L-1 each) and a certain dose (2.5 - 25 g.L-1) of silica coated nZVI, noncoated nZVI or microscale particles, to simulate conditions on contaminated sites. After five weeks, microscale particles degraded all three contaminants, but the degradation rate was up to two order lower than both nanoiron materials. In the presence of silica coated nZVI, the concentration of PCE, TCE and cis-DCE dropped to 2 %, 39 % and 35 % of an initial concentration. The evaluated kinetic constants of pseudo-first-order kinetics confirmed an increase in the removal rate of PCE for silica coated nZVI. On the contrary, TCE and cis-DCE were significantly fast degraded by nZVI. The change in the removal potential suggests that the silica coating influenced surface properties determining also degradation processes. Nevertheless, our study demonstrated that the silica (TEOS) coated nanoiron particles are suitable for the degradation of chlorinated ethylenes. We studied the degradation of different chlorinated ethylenes by silica coated nanoscale zerovalent iron particles nZVI. The silica coated nZVI has improved stability for its subsurface migration and can accelerate the degradation of studied contaminants. The reactivity of studied silica coated nZVI was compared to the uncoated nZVI and microscale zerovalent iron particles. To form the silica coating, the uncoated nanoiron particles in an aqueous suspension were modified by Stöber synthesis using tetraethylorthosilicate (TEOS). Lab-scale degradation experiments were performed in serum bottles containing a mixture of chlorinated ethylenes (? 5 mg.L-1 each) and a certain dose (2.5 - 25 g.L-1) of silica coated nZVI, noncoated nZVI or microscale particles, to simulate conditions on contaminated sites. After five weeks, microscale particles degraded all three contaminants, but the degradation rate was up to two order lower than both nanoiron materials. In the presence of silica coated nZVI, the concentration of PCE, TCE and cis-DCE dropped to 2 %, 39 % and 35 % of an initial concentration. The evaluated kinetic constants of pseudo-first-order kinetics confirmed an increase in the removal rate of PCE for silica coated nZVI. On the contrary, TCE and cis-DCE were significantly fast degraded by nZVI. The change in the removal potential suggests that the silica coating influenced surface properties determining also degradation processes. Nevertheless, our study demonstrated that the silica (TEOS) coated nanoiron particles are suitable for the degradation of chlorinated ethylenes.
dcterms:title
Degradation of chlorinated ethylenes by nanoscale zerovalent iron modified with silica Degradation of chlorinated ethylenes by nanoscale zerovalent iron modified with silica
skos:prefLabel
Degradation of chlorinated ethylenes by nanoscale zerovalent iron modified with silica Degradation of chlorinated ethylenes by nanoscale zerovalent iron modified with silica
skos:notation
RIV/60461373:22320/12:43893800!RIV13-MSM-22320___
n17:predkladatel
n21:orjk%3A22320
n3:aktivita
n16:S
n3:aktivity
S
n3:dodaniDat
n19:2013
n3:domaciTvurceVysledku
n4:6398979 n4:5305047
n3:druhVysledku
n9:D
n3:duvernostUdaju
n18:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
129900
n3:idVysledku
RIV/60461373:22320/12:43893800
n3:jazykVysledku
n8:eng
n3:klicovaSlova
silica; with; modified; iron; zerovalent; nanoscale; ethylenes; chlorinated; Degradation
n3:klicoveSlovo
n11:Degradation n11:silica n11:chlorinated n11:iron n11:nanoscale n11:ethylenes n11:with n11:modified n11:zerovalent
n3:kontrolniKodProRIV
[2B7A84D43322]
n3:mistoKonaniAkce
Brno
n3:mistoVydani
Ostrava
n3:nazevZdroje
NANOCON 2012 Conference Proceedings 4th International conference
n3:obor
n12:DK
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:rokUplatneniVysledku
n19:2012
n3:tvurceVysledku
Velimirovič, Milica Bastiens, Leen Honetschlägerová, Lenka Janouškovcová, Petra
n3:typAkce
n5:WRD
n3:zahajeniAkce
2012-10-23+02:00
s:numberOfPages
6
n20:hasPublisher
TANGER
n13:isbn
978-80-87294-32-1
n7:organizacniJednotka
22320