Catalytic destruction of paraoxon by metallomicelle layers of Co(II) and Cr(III) |
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Authors: | Email author" target="_blank">A?A?HafizEmail author M?Y?El?Awadi A?M?Badawi S?M?Mokhar |
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Affiliation: | (1) Applied Surfactants Laboratory, Egyptian Petroleum Research Institute (EPRI), Nasr City, Cairo, Egypt;(2) Chemistry Department, College for Women, Ain Shams University, Heleopolis, Cairo, Egypt |
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Abstract: | Two micellized ion complexes, Co(II) and Cr(III), were synthesized and found to possess good catalytic activity in cleaving
the paraoxon/cobalt (chromate) complex phosphate ester. The complexes orm metallomicelles, which bind the substrate by coordinating
with the phosphorus in the paraoxon (which is chemically similar to the nerve agents sarin and soman). Possible reasons for
the acceleration include enhanced electrophilicity of the micellized metals, enhanced surface activity, and the recognized
ability of cationic micelles to accelerate the cleavage of phosphate ester. The results of kinetic data (half-lives) for paraoxon
degradation were 16.5 and 28.9 min in the presence of Co(II) and Cr(III) metallomicelle layers, respectively. The higher the
value of the stability constant, the more stable the Co(II) and Cr(III) complexes. |
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Keywords: | Catalytic destruction Co(II) and Cr(III) metallomicelles paraoxon stability constant |
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