Degradation of the Chromophore Functions of Dyes in Irradiated Solutions

Radiolysis damages the system of conjugated bonds and thus leads to the degradation of the chromophore functions of dyes in aqueous solutions. Ten representatives of quinophthalone, indigo, triphenylmethane, and azo dyes exhibited the same type of correlations between the absorbed dose and the degre...

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Bibliographic Details
Published in:High energy chemistry 2023-04, Vol.57 (2), p.146-150
Main Authors: Kholodkova, E. M., Ponomarev, A. V.
Format: Article
Language:English
Subjects:
Aeration
Aqueous solutions
Chemistry
Chemistry and Materials Science
Chromophores
Conjugation
Degradation
Discoloration
Dyes
Electron beams
Indigo
Physical Chemistry
Radiation Chemistry
Radiation damage
Radiolysis
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Summary:Radiolysis damages the system of conjugated bonds and thus leads to the degradation of the chromophore functions of dyes in aqueous solutions. Ten representatives of quinophthalone, indigo, triphenylmethane, and azo dyes exhibited the same type of correlations between the absorbed dose and the degree of discoloration. It was shown using the method of competing scavengers that the color of aerated solutions decreased mainly due to the addition of OH radicals to the dyes. The radiation-chemical yields of discoloration ranged from 0.03 to 0.11 μmol/J and increased depending on the length of bond conjugation in the dye molecules. For practical electron-beam discoloration of dye solutions with a concentration of 20 mg/dm 3 , an absorbed dose of 1–1.5 kGy was sufficient.
ISSN:0018-1439
1608-3148
DOI:10.1134/S0018143923020078