Influence of annealing temperature on degradation efficiency and iron oxide transformations in CeO2/Fe-oxide sorbents

0536976 - ÚFM 2022 RIV US eng J - Článek v odborném periodiku
Životský, O. - Luňáček, J. - Jirásková, Yvonna - Buršík, Jiří - Ederer, J. - Janoš, P. - Cabanová, K.
Influence of annealing temperature on degradation efficiency and iron oxide transformations in CeO2/Fe-oxide sorbents.
AIP Advances. Roč. 11, č. 1 (2021), č. článku 015308. E-ISSN 2158-3226
Grant CEP: GA MŠMT(CZ) EF17_048/0007399
Institucionální podpora: RVO:68081723
Klíčová slova: CERIUM DIOXIDE * MAGNETIC-PROPERTIES * REACTIVE SORBENT * PARATHION METHYL * CEO2
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 1.697, rok: 2021
Způsob publikování: Open access
https://aip.scitation.org/doi/10.1063/9.0000133

The microstructural and physical properties of magnetically separable CeO2 (5 wt.%)/Fe-oxide sorbents, applicable for the decomposition of organophosphorus pesticides, are analyzed in dependence on calcination temperature. The sorbents are prepared using a two-step procedure: (1) synthesis of magnetite core from cheap and commercially available raw materials, and (2) the formation of cerium (III) carbonate by precipitation with the ammonium hydrogen carbonate, containing re-dispersed magnetite. The cerous carbonate/magnetite precursor is annealed in a muffle furnace at temperatures ranging from 473 to 1073 K for 2 h to obtain the CeO2/Fe-oxide reactive sorbents. Structural characterization of the samples is performed using X-ray diffraction, scanning electron microscopy, Raman and Fourier transform infrared spectroscopy. Magnetic properties are obtained from hysteresis loops, field-cooled and zero-field-cooled curves, first-order reversal curve (FORC) diagrams, and Henkel plots. Sorbents exhibit an increase in coercivity from 0.2 kA/m to about 20 kA/m and a decrease in saturation magnetization from roughly 50 Am2/kg to 1 Am2/kg after annealing at 973 K. This deterioration of magnetic properties is caused by the transformation of magnetite and maghemite into weakly ferromagnetic hematite, with a typical peak in FORC diagram and a Morin transition at about 200 K. The degradation efficiency towards parathion and paraoxon methyl is about 30% for samples annealed from 473 K to 773 K.
Trvalý link: http://hdl.handle.net/11104/0319609