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Statements

Subject Item
n2:RIV%2F44555601%3A13520%2F14%3A43885935%21RIV15-GA0-13520___
rdf:type
skos:Concept n18:Vysledek
dcterms:description
Cerium oxide belongs to the most important heterogeneous catalysts, but its applicability as so-called reactive sorbent for the degradation of toxic chemicals was only recently discovered. For these purposes, cerium oxide is prepared by precipitation of insoluble cerium salts (carbonates) with a subsequent thermal decomposition. Properties of cerium oxide prepared from the carbonate precursor are strongly affected by the temperature during the calcination. Main physicochemical properties of cerium oxide (specific surface area, crystallinity, and surface chemistry) were examined in dependence on the calcination temperature. As the adsorptive properties of CeO2 are undoubtedly of great importance in the abovementioned applications, the adsorption ability was studied using an azo dye Acid Orange 7 (AO7) as a model compound. The highest sorption efficiency towards AO7 exhibited sorbents prepared at temperatures below 700 degrees C, which was attributed mainly to the presence of hydroxyl groups on the oxide surface. A strong correlation was found between an adsorption efficiency of cerium oxides and their degradation efficiency for organophosphate pesticide parathion methyl. The } Ce-OH groups on the sorbent surface are responsible for the dye binding by the surface-complexation mechanism, and probably also for the nucleophilic cleavage of the P-O-aryl bond in the pesticide molecule. Cerium oxide belongs to the most important heterogeneous catalysts, but its applicability as so-called reactive sorbent for the degradation of toxic chemicals was only recently discovered. For these purposes, cerium oxide is prepared by precipitation of insoluble cerium salts (carbonates) with a subsequent thermal decomposition. Properties of cerium oxide prepared from the carbonate precursor are strongly affected by the temperature during the calcination. Main physicochemical properties of cerium oxide (specific surface area, crystallinity, and surface chemistry) were examined in dependence on the calcination temperature. As the adsorptive properties of CeO2 are undoubtedly of great importance in the abovementioned applications, the adsorption ability was studied using an azo dye Acid Orange 7 (AO7) as a model compound. The highest sorption efficiency towards AO7 exhibited sorbents prepared at temperatures below 700 degrees C, which was attributed mainly to the presence of hydroxyl groups on the oxide surface. A strong correlation was found between an adsorption efficiency of cerium oxides and their degradation efficiency for organophosphate pesticide parathion methyl. The } Ce-OH groups on the sorbent surface are responsible for the dye binding by the surface-complexation mechanism, and probably also for the nucleophilic cleavage of the P-O-aryl bond in the pesticide molecule.
dcterms:title
Thermal treatment of cerium oxide and its properties: Adsorption ability versus degradation efficiency Thermal treatment of cerium oxide and its properties: Adsorption ability versus degradation efficiency
skos:prefLabel
Thermal treatment of cerium oxide and its properties: Adsorption ability versus degradation efficiency Thermal treatment of cerium oxide and its properties: Adsorption ability versus degradation efficiency
skos:notation
RIV/44555601:13520/14:43885935!RIV15-GA0-13520___
n4:aktivita
n19:P
n4:aktivity
P(GAP106/12/1116)
n4:cisloPeriodika
2014
n4:dodaniDat
n11:2015
n4:domaciTvurceVysledku
n9:5349710
n4:druhVysledku
n16:J
n4:duvernostUdaju
n7:S
n4:entitaPredkladatele
n15:predkladatel
n4:idSjednocenehoVysledku
50359
n4:idVysledku
RIV/44555601:13520/14:43885935
n4:jazykVysledku
n12:eng
n4:klicovaSlova
Powder; Catalyst; Surfaces; Carbonate; Morphology; Temperature; Nanocryslas; Dioxide; CeO2 Nanoparicles; Precipation method
n4:klicoveSlovo
n5:Morphology n5:Temperature n5:Powder n5:Surfaces n5:Nanocryslas n5:Catalyst n5:Dioxide n5:Carbonate n5:Precipation%20method n5:CeO2%20Nanoparicles
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[22D546AAFD24]
n4:nazevZdroje
Advances in Materials Science and Engineering
n4:obor
n17:CA
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
5
n4:projekt
n14:GAP106%2F12%2F1116
n4:rokUplatneniVysledku
n11:2014
n4:svazekPeriodika
2014
n4:tvurceVysledku
Ederer, Jakub Šťastný, Martin Janoš, Pavel Kormunda, Martin Hladík, Tomáš
n4:wos
000337830900001
s:issn
1687-8434
s:numberOfPages
12
n13:doi
10.1155/2014/706041
n8:organizacniJednotka
13520