Hydroxyl radical (OH.) is the most reactive oxidation species used in water treatment, having oxidation potential between 2.8 eV at pH-0 and 1.95 eV at pH-14
It may forming two possible ways
Oxidation: The photocatalyst surface contains water, which is mentioned as “absorbed water.” This water is oxidized by positive holes created in the valence band due to the electrons shift to the conduction band as a result of light irradiation, thus making way for the formation of hydroxyl (OH∙) radicals (agents which have strong oxidative decomposing power). Afterward, these hydroxyl radicals react with organic matter to fragment the dye molecules.
Reduction: The conduction band electrons react with dissolved oxygen species to form superoxide anions. These superoxide anions react with H+ to forming peroxide or changing to hydrogen peroxide, then it will produce OH- and OH., which could effectively fragment the dye molecules
Hello,
I'm also looking for oxidation potentials of some radical species. Could you please share the reference of the table which you've used above? Thank you in advance.
Best regards
Hello Derman Aksit
You can find from the link, which I have enclosed
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/environmental-pollution
Best Regards
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