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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F14%3A00427656%21RIV15-GA0-61388955
rdf:type
skos:Concept n12:Vysledek
dcterms:description
Anatase and rutile nanoparticulate samples, prepared via TiCl4 hydrolysis using either ordinary or (17)Oenriched water (up to 90%) with subsequent heat-treatment under vacuum, were investigated by EPR spectroscopy upon UV photoexcitation in the temperature range 100-160 K. The experimental EPR spectra of photoexcited anatase (TiO2)-O-16 revealed the presence of paramagnetic signals attributed to Ti(III) species, two kinds of O- centers produced from lattice O2- ions, along with (O2 center dot-/HO2 center dot) radicals which originated from adsorbed molecular oxygen. The presence of O-17 atoms in the anatase crystal lattice was reflected in substantial EPR line broadening and the experimental spectrum was interpreted as a superposition of signals attributed to Ti(III) with axial symmetry arising from an interaction with an O-17 nucleus (g(perpendicular to) = 1.962, g(parallel to) = 1.923; A(perpendicular to) = 1.68 mT, A(parallel to) = 1.61 mT), the signal of a photogenerated hole O-17(-) (g(perpendicular to) = 2.019, g(parallel to) = 2.004; A(perpendicular to) = 1.76 mT, A(parallel to) = 10.61 mT) and O-2(center dot-). Due to the thermal treatment at higher temperature (1000 C) both rutile samples showed a variety of paramagnetic signals attributed to Ti(III) sites already present before photoexcitation. The EPR spectrum of (17)O(-)enriched rutile sample was simulated as a superposition of Ti(III)-O-17 sites and photogenerated ozonide in the rutile matrix. The ability of synthesized anatase and rutile nanopowders to produce hydroxyl radicals upon UV photoexcitation in the aerated aqueous suspensions was monitored via an EPR spin trapping technique using 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as the spin trapping agent. Upon continuous exposure of titania suspensions a typical four-line EPR signal of the center dot DMPO-OH spin-adduct was found (A(N) = 1.492 mT,A(H) = 1.476 mT; g = 2.0059). Anatase and rutile nanoparticulate samples, prepared via TiCl4 hydrolysis using either ordinary or (17)Oenriched water (up to 90%) with subsequent heat-treatment under vacuum, were investigated by EPR spectroscopy upon UV photoexcitation in the temperature range 100-160 K. The experimental EPR spectra of photoexcited anatase (TiO2)-O-16 revealed the presence of paramagnetic signals attributed to Ti(III) species, two kinds of O- centers produced from lattice O2- ions, along with (O2 center dot-/HO2 center dot) radicals which originated from adsorbed molecular oxygen. The presence of O-17 atoms in the anatase crystal lattice was reflected in substantial EPR line broadening and the experimental spectrum was interpreted as a superposition of signals attributed to Ti(III) with axial symmetry arising from an interaction with an O-17 nucleus (g(perpendicular to) = 1.962, g(parallel to) = 1.923; A(perpendicular to) = 1.68 mT, A(parallel to) = 1.61 mT), the signal of a photogenerated hole O-17(-) (g(perpendicular to) = 2.019, g(parallel to) = 2.004; A(perpendicular to) = 1.76 mT, A(parallel to) = 10.61 mT) and O-2(center dot-). Due to the thermal treatment at higher temperature (1000 C) both rutile samples showed a variety of paramagnetic signals attributed to Ti(III) sites already present before photoexcitation. The EPR spectrum of (17)O(-)enriched rutile sample was simulated as a superposition of Ti(III)-O-17 sites and photogenerated ozonide in the rutile matrix. The ability of synthesized anatase and rutile nanopowders to produce hydroxyl radicals upon UV photoexcitation in the aerated aqueous suspensions was monitored via an EPR spin trapping technique using 5,5-dimethyl-1-pyrroline N-oxide (DMPO) as the spin trapping agent. Upon continuous exposure of titania suspensions a typical four-line EPR signal of the center dot DMPO-OH spin-adduct was found (A(N) = 1.492 mT,A(H) = 1.476 mT; g = 2.0059).
dcterms:title
EPR study of 17O-enriched titania nanopowders under UV irradiation EPR study of 17O-enriched titania nanopowders under UV irradiation
skos:prefLabel
EPR study of 17O-enriched titania nanopowders under UV irradiation EPR study of 17O-enriched titania nanopowders under UV irradiation
skos:notation
RIV/61388955:_____/14:00427656!RIV15-GA0-61388955
n3:aktivita
n4:P n4:I
n3:aktivity
I, P(GA13-07724S)
n3:cisloPeriodika
JUL 2014
n3:dodaniDat
n6:2015
n3:domaciTvurceVysledku
n7:5808111 n7:9704418
n3:druhVysledku
n17:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
14881
n3:idVysledku
RIV/61388955:_____/14:00427656
n3:jazykVysledku
n16:eng
n3:klicovaSlova
anatase; rutile; charge carriers generation
n3:klicoveSlovo
n10:rutile n10:anatase n10:charge%20carriers%20generation
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[CE9C1B54D17F]
n3:nazevZdroje
Catalysis Today
n3:obor
n11:CG
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n18:GA13-07724S
n3:rokUplatneniVysledku
n6:2014
n3:svazekPeriodika
230
n3:tvurceVysledku
Barbieriková, Z. Kavan, Ladislav Zukalová, Markéta Dvoranová, D. Brezová, V.
n3:wos
000333800300019
s:issn
0920-5861
s:numberOfPages
7
n14:doi
10.1016/j.cattod.2013.11.026