Adsorption of diazinon and fenitothion on MCM-41 and MCM-48 mesoporous silicas from non-polar solvent |
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Authors: | Mahsa Armaghan Mostafa M Amini |
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Institution: | (1) Institute of Physics, Tampere University of Technology, 692, FIN-33101 Tampere, Finland;(2) Institute of Materials Science, Tampere University of Technology, 589, FIN-33101 Tampere, Finland |
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Abstract: | The adsorption of two common organophosphorus pesticides, diethoxy-(2-isopropyl-6-methyl-4-pyrimidinyl)oxy]-thioxophosphorane
(diazinon) and dimethoxy-(3-methyl-4-nitrophenoxy)-thioxophosphorane (fenitrothion), by MCM-41 and MCM-48 mesoporous silicas
at room temperature was investigated. UVvis and IR spectroscopy, small-angle X-ray diffraction, and the specific surface area
analysis (S
BET) were used to study the adsorption behavior of diazinon and fenitrothion. The results show that the MCM-41 and MCM-48 mesoporous
silicas adsorb diazinon more efficiently than fenitrothion. The extraction of adsorbed materials from the adsorbents with
polar solvents and subsequent analysis by 31P NMR showed that the adsorption of diazinon and fenitrothion on mesoporous silicas is destructive and non-destructive, respectively.
Nitrogen adsorption measurements showed that the specific surface area of both silicas decreases after the adsorption of pesticides,
and the larger effect is observed for diazinon. The article is published in the original. |
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