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%2F68081723%3A_____%2F21%3A00536976" target="_blank" >RIV/68081723:_____/21:00536976 - isvavai.cz</a>
Alternative codes found
RIV/44555601:13520/20:43895731 RIV/61989100:27240/21:10246393 RIV/61989100:27350/21:10246393
Result on the web
<a href="https://aip.scitation.org/doi/10.1063/9.0000133" target="_blank" >https://aip.scitation.org/doi/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
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10511 - Environmental sciences (social aspects to be 5.7)
Result continuities
Project
<a href="/en/project/EF17_048%2F0007399" target="_blank" >EF17_048/0007399: New Composite Materials for Environmental Applications</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
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
2158-3226
Volume of the periodical
11
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
015308
UT code for WoS article
000607146800007
EID of the result in the Scopus database
2-s2.0-85099216097