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Photocatalytic Properties of Mechanochemically Synthesized Nanocrystalline ZnAl_2O_4 and CdSe

100%
Kostova N., Eliyas A., Fabián M., Achimovičová M., Baláž P.
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vol. 126
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issue 4
967-970
EN
Nanocrystalline powders of ZnAl_2O_4 and CdSe were prepared via mechanochemical synthesis. Powder slurries were coated as thin films on SiO_2 thin layer chromatography (TLC) sheet by capillary method. The photocatalytic activity of the film coating was tested in a self-made gas-phase flat-plate continuous-flow photocatalytic reactor with toluene as model air contaminant. The tested nanocrystalline ZnAl_2O_4 turned out to be poor oxidation photocatalyst under UV irradiation. CdSe displays considerable photocatalytic activity under visible light, where TiO_2 is inactive. The nonconventional one-step mechanochemical route to ZnAl_2O_4 and CdSe synthesis offers several advantages compared to traditional processing routes, including low-temperature solid state reactions at ambient temperature, absence of organic templates contamination and low expenses.
2
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Magnetic Properties of Mechanochemically Synthesized Mixed Oxides

100%
Kostova N., Zorkovská A., Kováč J., Velinov N., Baláž P.
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vol. 126
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issue 1
411-412
EN
The mixed oxides Fe_{2}O_{3}-ZnO have been obtained in nanocrystalline state by reactive milling in a high-energy planetary mill, from a stoichiometric mixture of hematite and ZnO. The magnetic properties of samples were evaluated by magnetization measurements and Mössbauer spectrometry. A post milling annealing promotes the solid state reaction and improves the zinc ferrite formation, paramagnetic ZnFe_{2}O_{4} phase is formed. Further mechanical activation leads to structural transformation into Wüstite-type (FeZn)O mixed oxide, with ferromagnetic hysteresis and increased magnetization.
3
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Study of the Mechanochemical Reduction of Ilmenite Concentrate by Addition of Aluminum

86%
Achimovičová M., Gock E., Turianicová E., Kostova N., Velinov N., Kaňuchová M., Baláž P.
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vol. 126
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issue 4
867-870
EN
Mechanochemical reduction of ilmenite concentrate (FeTiO_{3}) with elemental aluminum powder was performed by high-energy milling in an industrial eccentric vibratory ball mill ESM 656-0.5 ks (Siebtechnik, Germany). The mechanochemically reduced ilmenite with various times of milling was characterized by X-ray diffraction analysis, which confirmed the presence of the Al_2O_3 and Fe_2Ti phases after 120 min of milling. Thermal analysis evidenced the completion of a mechanochemical reduction during milling. After 360 min of milling, the Fe_2Ti phase decomposed to α-(Fe,Ti) alloy, which was proven by ^{57}Fe Mössbauer spectroscopy. X-ray photoelectron spectroscopy detected the amorphous TiO phase in product after mechanochemical reduction, which is in accordance with thermodynamic prediction. Decreasing of specific surface area after 60 min of milling resulted from growing layers of the solid products of FeTiO_3 mechanochemical reduction.
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