Degradation of parathion methyl by reactive sorption on the cerium oxide surface: The effect of solvent on the degradation efficiency

0556596 - ÚACH 2023 RIV SA eng J - Journal Article
Janoš, P. - Ederer, J. - Šťastný, Martin - Tolasz, Jakub - Henych, Jiří
Degradation of parathion methyl by reactive sorption on the cerium oxide surface: The effect of solvent on the degradation efficiency.
Arabian Journal of Chemistry. Roč. 15, č. 6 (2022), č. článku 103852. ISSN 1878-5352. E-ISSN 1878-5379
R&D Projects: GA ČR(CZ) GA19-07460S; GA MŠMT(CZ) LM2018124
Institutional support: RVO:61388980
Keywords : Cerium oxide * Nucleophilic substitution SN2 * Reaction mechanisms * Solvent effect * Toxic organophosphate destruction
OECD category: Inorganic and nuclear chemistry
Impact factor: 6, year: 2022
Method of publishing: Open access

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.
Permanent Link: http://hdl.handle.net/11104/0330769