Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 15, Issue 6, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2022.103852
Keywords
Cerium oxide; Toxic organophosphate destruction; Solvent effect; Reaction mechanisms; Nucleophilic substitution; S(N )2
Categories
Funding
- Ministry of Education, Youth and Sports of the Czech Republic [LM2018124]
- Czech Scientific Foundation [19-07460S]
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This study used a simple and easily scalable wet procedure to prepare nanocrystalline cerium oxide capable of decomposing the organophosphate pesticide parathion methyl. The research revealed the influence of solvent systems on the degradation efficiency of cerium oxide, providing a theoretical basis for further studies on the degradation of organophosphate compounds.
A simple and easily scalable wet procedure was used to prepare nanocrystalline cerium oxide capable of destroying the toxic organophosphate pesticide parathion methyl. The synthetic procedure consists of the direct precipitation of cerous salt with aqueous ammonia in the absence of CO2. The prepared cerium oxide was able to decompose the organophosphate compounds both in nonpolar (e.g., heptane) and polar aprotic (e.g., acetonitrile) solvents. However, in solvents with hydrogen-bond donating ability, the -OH groups on the cerium oxide surface were solvated and inactivated. The preferential solvation model was used to express the experimental dependencies of the cerium oxide degradation efficiency on the composition of the water-acetonitrile mixture. In certain solvent systems, some empirical polarity scales, such as the alpha-scale or the Dimrodth-Richardt parameter ET(30), may be correlated with the degradation efficiency of cerium oxide.(c) 2022 Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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