Repozytorium ZUT
Repozytorium ZUT jest cyfrową usługą, która gromadzi, przechowuje i udostępnia materiały cyfrowe utworzone przez społeczność akademicką Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie
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Bibliografia publikacji pracowników Akademii Rolniczej w Szczecinie za rok 2003
(Wydawnictwo Akademii Rolniczej w Szczecinie, 2005) Jankowska, Elżbieta opracowała; Akademia Rolnicza w Szczecinie
Bibliografia publikacji pracowników Akademii Rolniczej w Szczecinie za rok 2004
(Wydawnictwo Akademii Rolniczej w Szczecinie, 2005) Jankowska , Elżbieta opracowała; Akademia Rolnicza w Szczecinie
Magnetic moment centers in titanium dioxide photocatalysts loaded on reduced graphene oxide flakes
(De Gruyter, 2021-01) Guskos, Nikos; Zolnierkiewicz, Grzegorz; Guskos, Aleksander; Aidinis, Konstantinos; Wanag, Agnieszka; Kusiak-Nejman, Ewelina; Narkiewicz, Urszula; Morawski, Antoni W.; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
A whole series of titania nanocomposites modified with reduced graphene oxide (rGO) was prepared using solvothermal method followed by calcination. Modification of titania with rGO has been found to lead to better photocatalytic properties. The highest photocatalytic performance was obtained at calcination temperature of 600 degrees C. Electron paramagnetic resonance/ferromagnetic resonance measurements showed oxygen defects and ferromagnetic ordering systems. The linewidth of resonance line of oxygen defects decreased linearly with calcination temperature increasing up to 600 degrees C and an accompanying growth of mean crystallite size of anatase phase. The integrated resonance line intensity of oxygen defects depended on the calcination temperature and caused a very large increase in the intensity of resonance lines originating from oxygen defects, because inert atmosphere of calcination was enhanced by graphene presence. The occurrence of magnetic ordering system significantly influenced the performance of photocatalytic processes by changing the amount of oxygen defects.
Magnetic Resonance Studies of Hybrid Nanocomposites Containing Nanocrystalline TiO2 and Graphene-Related Materials
(MDPI, 2022-03-18) Guskos, Nikos; Zolnierkiewicz, Grzegorz; Kusiak-Nejman, Ewelina; Guskos, Aleksander; Aidinis, Konstantinos; Bobrowska, Marta; Berczynski, Paweł; Wanag, Agnieszka; Pelech, Iwona; Narkiewicz, Urszula; Morawski, Antoni W.; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
Nanocomposites based on nanocrystalline titania modified with graphene-related materials
(reduced and oxidized form of graphene) showed the existence of magnetic agglomerates. All
parameters of magnetic resonance spectra strongly depended on the materials’ modification processes.
The reduction of graphene oxide significantly increased the number of magnetic moments, which
caused crucial changes in the reorientation and relaxation processes. At room temperature, a wide
resonance line dominated for all nanocomposites studied and in some cases, a narrow resonance
line derived from the conduction electrons. Some nanocomposites (samples of titania modified with
graphene oxide, prepared with the addition of water or butan-1-ol) showed a single domain magnetic
(ferromagnetic) arrangement, and others (samples of titania modified with reduced graphene oxide)
exhibited magnetic anisotropy. In addition, the spectra of EPR from free radicals were observed for all
samples at the temperature of 4 K. The magnetic resonance imaging methods enable the capturing of
even a small number of localized magnetic moments, which significantly affects the physicochemical
properties of the materials.
New Insight on Carbon Dioxide-Mediated Hydrogen Production
(Chemistry Europe, European Chemical Societies Publishing, 2022-04-03) Morawski, Antoni W.; Kusiak-Nejman, Ewelina; Pelech, Iwona; Cmielewska, Katarzyna; Sibera, Daniel; Staciwa, Piotr; Wanag, Agnieszka; Gano, Marcin; Ekiert, Ewa; Kapica-Kozar, Joanna; Witkowski, Kordian; Narkiewicz, Urszula; Zachodniopomorski Uniwersytet Technologiczny w Szczecinie
A new approach to hydrogen production from water is described. This simple method is based on carbon dioxide-mediated water decomposition under UV radiation. The water contained dissolved sodium hydroxide, and the solution was saturated with gaseous carbon dioxide. During saturation, the pH decreased from about 11.5 to 7-8. The formed bicarbonate and carbonate ions acted as scavengers for hydroxyl radicals, preventing the recombination of hydroxyl and hydrogen radicals and prioritizing hydrogen gas formation. In the presented method, not yet reported in the literature, hydrogen production is combined with carbon dioxide. For the best system with alkaline water (0.2 m NaOH) saturated with CO2 under UV-C, the hydrogen production amounted to 0.6 mu mol h(-1) during 24 h of radiation.