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Hydroxyl radicals will form by the shrinking of microbubbles; it is due to an increase in the value of electromotive force on the liquid interface. Hydroxyl radical(•OH) and H + accumulate rapidly at the bubble interface. Ozone reacts with hydroxyl ions and hydroxyl radicals will form. The formation of hydroxyl radicals is pH-dependent.
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The hydroxyl radical has a much higher oxidation potential than ozone or hydrogen peroxide and usually reacts at least one million times faster, thus leading to a smaller contact time and footprint. This powerful AOP disinfection method can be applied to micropollutants removal, organic pollutants removal, drinking water treatment, municipal ...
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Hydroxyl radicals are produced with the help of one or more primary oxidants (e.g. ozone, hydrogen peroxide, oxygen) and/or energy sources (e.g. ultraviolet light) or catalysts (e.g. titanium dioxide). Precise, pre-programmed dosages, sequences and combinations of these reagents are applied in order to obtain a maximum •OH yield.
The free radicals generated by this process engage in secondary reactions. For example, the hydroxyl is a powerful, non-selective oxidant. [6] Oxidation of an organic compound by Fenton's reagent is rapid and exothermic and results in the oxidation of contaminants to primarily carbon dioxide and water.
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When the solution has stopped absorbing ozone, the excess ozone oxidizes the iodide to iodine, which can easily be observed by its violet color. [6] For closer control of the reaction itself, an indicator such as Sudan Red III can be added to the reaction mixture. Ozone reacts with this indicator more slowly than with the intended ozonolysis ...
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