Influence of annealing temperature on degradation efficiency and iron oxide transformations in CeO2/Fe-oxide sorbents
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13520%2F20%3A43895731" target="_blank" >RIV/44555601:13520/20:43895731 - isvavai.cz</a>
Alternative codes found
RIV/68081723:_____/21:00536976 RIV/61989100:27240/21:10246393 RIV/61989100:27350/21:10246393
Result on the web
<a href="https://aip.scitation.org/doi/full/10.1063/9.0000133" target="_blank" >https://aip.scitation.org/doi/full/10.1063/9.0000133</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/9.0000133" target="_blank" >10.1063/9.0000133</a>
Alternative languages
Result language
angličtina
Original language name
Influence of annealing temperature on degradation efficiency and iron oxide transformations in CeO2/Fe-oxide sorbents
Original language description
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.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
AIP Advances
ISSN
2158-3226
e-ISSN
—
Volume of the periodical
11
Issue of the periodical within the volume
015308
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
1-12
UT code for WoS article
000607146800007
EID of the result in the Scopus database
2-s2.0-85099216097