Who can explain the phenomenon !!! that occurs in my experiments when I do a degradation experiment of MO dye using photocatalyst ZnO:Ce where the photocatalyst works to remove the dye within the first half an hour under UV light then the dye reappears again in the solution and the same happened under sunlight the dye disappears within an hour and then reappears again as if nothing had happened at all.
i did the UV-Vis spectrometer for these experiments that approved this phenomenon.
please kindly anyone can help .
give suggestions or explanations
Thank you
Dear Dr. Awras
In general, decolorization of dyes can be achieved by a reductive mechanism and the reduced form is then further degraded to form the final degradation products. In certain cases, and undere certain experimental conditions, the photoreduced species might be re-oxidized back to the colored dye molecules (this reversibility depends on the experimental conditions and not a general case).
Braa Alansary thank you for your answer
Will you please resend the attachment pdf again, because I couldn't open it?
many thanks
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