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Azo Dye Ozone Oxidation Mechanism.pdf

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The ozonation of cationic red X-GRL azo dye was performed in a 3.5 L semi-sequence batch reactor. GC / MS characterization and GC half
Quantitative methods determine the appearance order and concentration changes of various intermediates of the dye during ozone oxidation, combining the stoichiometry of the reaction between ozone and dye
Ratio, the drop of solution pH and NO3 during the reaction
-The formation of the ozone oxidation mechanism of the dye can be divided into three stages, namely:
The stage of purple shift of large absorption peaks; the stage of chromophore decomposition and dye decoloration; the colorless intermediates are further degraded into small organic molecules such as organic acids, aldehydes, ketones and alkanes
The conversion path of 6 nitrogens in the dye molecule is determined, that is: 4 nitrogen atoms are converted into 2 molecules of N2, and the other 2 nitrogen atoms are converted into 1 point.
Organic nitrogen compounds and 1 molecule of NO-
3. Ozone oxidation of dyes is mainly based on direct oxidation
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