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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Iron–Carbon Nanospheres as Promising Material for Magnetic Assisted Adsorption and Separation of Impurities from a Liquid Phase
(MDPI, 2024-04-29) Pełech, Iwona; Lewinska, Sabina; Arciszewska, Monika; Khaliq, Abdul; Ślawska-Waniewska, Anna; Sibera, Daniel; Staciwa, Piotr; Narkiewicz, Urszula; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Institute of Physics, Polish Academy of Sciences; Institute of Physics, Polish Academy of Sciences; Institute of Physics, Polish Academy of Sciences; Institute of Physics, Polish Academy of Sciences; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Construction and Road Engineering, Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin; Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin
The composites containing various iron compounds and highly microporous carbon spheres were produced and investigated for structural and magnetic properties. Iron citrate, nitrate and chloride were used to prepare samples and the obtained products contained iron, iron carbide or magnetite. All the produced samples were characterized by high porosity and good magnetic properties. The coupling of the high porosity of carbon spheres with magnetic properties of iron compounds provides a potential application of the composites to removal of impurities from water, followed by a magnetic separation of the sorbent.
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; Żolnierkiewicz, Grzegorz; Kusiak-Nejman, Ewelina; Guskos, Aleksander; Aidinis, Konstantinos; Bobrowska, Marta; Berczynski, Paweł; Wanag, Agnieszka; Pełech, 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 resonanc 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.