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Statements

Subject Item
n2:RIV%2F46747885%3A24620%2F13%3A%230000387%21RIV14-MSM-24620___
rdf:type
n11:Vysledek skos:Concept
dcterms:description
Zero-valent transition metals are well known reductants and are widely used for remediation of contaminated areas due to their ability to dechlorinate contaminants such as PCBs and chlorinated solvents. In particular, metallic iron nanoparticles are drawing much attention due to their high surface area to volume ratio and high surface energy, which provides much greater reactivity than bulk scrap metal or iron filling/granule surfaces. Nanofer 25S zero-valent iron nanoparticles are prepared through reduction of nanosized ferrihydrite exposed to a hydrogen atmosphere in a high temperature oven. In this study, we utilise this material’s reactivity for analytical rather than remedial aims. There is some controversy over possible degradation pathways of carbon tetrachloride dissolved in groundwater. Although many previous studies of carbon tetrachloride’s toxicological mode of action have consistently shown its stability in the presence of oxygen, a growing number of articles describe degradation of carbon tetrachloride in a modified Fenton system. In such reaction system, iron catalysed hydrogen peroxide decomposition is a source of intentionally produced ROS and superoxide radical anion is believed to be responsible specie for carbon tetrachloride degradation. However, our attempts to reproduce such results have so far been unsuccessful. Zero-valent transition metals are well known reductants and are widely used for remediation of contaminated areas due to their ability to dechlorinate contaminants such as PCBs and chlorinated solvents. In particular, metallic iron nanoparticles are drawing much attention due to their high surface area to volume ratio and high surface energy, which provides much greater reactivity than bulk scrap metal or iron filling/granule surfaces. Nanofer 25S zero-valent iron nanoparticles are prepared through reduction of nanosized ferrihydrite exposed to a hydrogen atmosphere in a high temperature oven. In this study, we utilise this material’s reactivity for analytical rather than remedial aims. There is some controversy over possible degradation pathways of carbon tetrachloride dissolved in groundwater. Although many previous studies of carbon tetrachloride’s toxicological mode of action have consistently shown its stability in the presence of oxygen, a growing number of articles describe degradation of carbon tetrachloride in a modified Fenton system. In such reaction system, iron catalysed hydrogen peroxide decomposition is a source of intentionally produced ROS and superoxide radical anion is believed to be responsible specie for carbon tetrachloride degradation. However, our attempts to reproduce such results have so far been unsuccessful.
dcterms:title
Analytical utilization of zero-valent iron nanoparticles Analytical utilization of zero-valent iron nanoparticles
skos:prefLabel
Analytical utilization of zero-valent iron nanoparticles Analytical utilization of zero-valent iron nanoparticles
skos:notation
RIV/46747885:24620/13:#0000387!RIV14-MSM-24620___
n11:predkladatel
n17:orjk%3A24620
n3:aktivita
n18:P
n3:aktivity
P(ED0005/01/01)
n3:dodaniDat
n8:2014
n3:domaciTvurceVysledku
n4:9681582 n4:2423057 n4:6226043
n3:druhVysledku
n14:O
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
60778
n3:idVysledku
RIV/46747885:24620/13:#0000387
n3:jazykVysledku
n10:eng
n3:klicovaSlova
zero-valent, iron, nanoparticles
n3:klicoveSlovo
n6:zero-valent n6:iron n6:nanoparticles
n3:kontrolniKodProRIV
[6AFCAF2EE654]
n3:obor
n15:CB
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n13:ED0005%2F01%2F01
n3:rokUplatneniVysledku
n8:2013
n3:tvurceVysledku
Černík, Miroslav Homolková, Martina Hrabák, Pavel
n7:organizacniJednotka
24620