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Statements

Subject Item
n2:RIV%2F44555601%3A13520%2F14%3A43886499%21RIV15-MSM-13520___
rdf:type
n16:Vysledek skos:Concept
dcterms:description
Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and other organophosphates pesticides, chlorpyrifos, dichlofenthion, fenchlorphos, and prothiofos, as well as of some chemical warfare agents - nerve gases soman (VX). CeO2 specimens were prepared by calcination of basic cerous carbonate. The CeO2 samples containing certain amounts (1 wt.%?5wt.%) of the neighboring lanthanides (La, Pr, Nd) were prepared in a similar way from pure lanthanide salts. It was shown that ceria accelerated markedly the decomposition of parathion methyl causing the cleavage of the P-O-aryl bond in the pesticide molecule. The degradation times (reaction half-times) were in an order of minutes in the presence of CeO2, compared to hours or days under common environmental conditions. The reaction in suitable organic solvents allowed conversions of about 90% for parathion methyl loading of 20 mg pesticide/g CeO2 within 2 h with a reactant half-life in the order of 0.1 min. At optimum calcination temperature (about 773.15 K), the produced ceria retained a sufficiently high surface area, and attained an optimum degree of crystallinity (related to a number of crystal defects, and thus potential reactive sites). A fast organophosphate degradation was demonstrated not only in non-polar solvents (such as heptane), but also in polar aprotic solvents (acetonitrile, acetone) that are miscible with water. This opens new possibilities for designing more versatile decontamination strategies. The cleavage of phosphate ester bonds is of a great importance not only for the degradation of dangerous chemicals (chemical weapons, pesticides), but also for interactions of ceria in biologically relevant systems. Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and other organophosphates pesticides, chlorpyrifos, dichlofenthion, fenchlorphos, and prothiofos, as well as of some chemical warfare agents - nerve gases soman (VX). CeO2 specimens were prepared by calcination of basic cerous carbonate. The CeO2 samples containing certain amounts (1 wt.%?5wt.%) of the neighboring lanthanides (La, Pr, Nd) were prepared in a similar way from pure lanthanide salts. It was shown that ceria accelerated markedly the decomposition of parathion methyl causing the cleavage of the P-O-aryl bond in the pesticide molecule. The degradation times (reaction half-times) were in an order of minutes in the presence of CeO2, compared to hours or days under common environmental conditions. The reaction in suitable organic solvents allowed conversions of about 90% for parathion methyl loading of 20 mg pesticide/g CeO2 within 2 h with a reactant half-life in the order of 0.1 min. At optimum calcination temperature (about 773.15 K), the produced ceria retained a sufficiently high surface area, and attained an optimum degree of crystallinity (related to a number of crystal defects, and thus potential reactive sites). A fast organophosphate degradation was demonstrated not only in non-polar solvents (such as heptane), but also in polar aprotic solvents (acetonitrile, acetone) that are miscible with water. This opens new possibilities for designing more versatile decontamination strategies. The cleavage of phosphate ester bonds is of a great importance not only for the degradation of dangerous chemicals (chemical weapons, pesticides), but also for interactions of ceria in biologically relevant systems.
dcterms:title
Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and some other organophosphates Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and some other organophosphates
skos:prefLabel
Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and some other organophosphates Cerium dioxide as a new reactive sorbent for fast degradation of parathion methyl and some other organophosphates
skos:notation
RIV/44555601:13520/14:43886499!RIV15-MSM-13520___
n3:aktivita
n12:S n12:I
n3:aktivity
I, S
n3:cisloPeriodika
4
n3:dodaniDat
n9:2015
n3:domaciTvurceVysledku
n6:3521117 n6:2038404 n6:5349710 n6:6257380 n6:7535694 n6:7539487 n6:1641905
n3:druhVysledku
n15:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
6515
n3:idVysledku
RIV/44555601:13520/14:43886499
n3:jazykVysledku
n14:eng
n3:klicovaSlova
rare earths; non-aqueous solvents; hydrolysis; chemical warfare agents; parathion methyl; organophosphate pesticide; lanthanides; carbonate precursor; cerium dioxide
n3:klicoveSlovo
n4:non-aqueous%20solvents n4:hydrolysis n4:cerium%20dioxide n4:organophosphate%20pesticide n4:rare%20earths n4:parathion%20methyl n4:lanthanides n4:chemical%20warfare%20agents n4:carbonate%20precursor
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[919ECAEFBAFC]
n3:nazevZdroje
Journal of Rare Earths
n3:obor
n13:CA
n3:pocetDomacichTvurcuVysledku
7
n3:pocetTvurcuVysledku
10
n3:rokUplatneniVysledku
n9:2014
n3:svazekPeriodika
32
n3:tvurceVysledku
Došek, Marek Grygar, T. M. Kormunda, Martin Štengl, Václav Vrtoch, Ľuboš Ederer, Jakub Kuráň, Pavel Pilařová, Věra Šťastný, Martin Janoš, Pavel
n3:wos
000335925000010
s:issn
1002-0721
s:numberOfPages
11
n17:doi
10.1016/S1002-0721(14)60079-X
n11:organizacniJednotka
13520