Degradation of the Chromophore Functions of Dyes in Irradiated Solutions

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Resumo

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/dm3, an
absorbed dose of 1–1.5 kGy was sufficient.

Sobre autores

E. Kholodkova

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: ponomarev@ipc.rssi.ru
Moscow, 119071 Russia

A. Ponomarev

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Autor responsável pela correspondência
Email: ponomarev@ipc.rssi.ru
Moscow, 119071 Russia

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Declaração de direitos autorais © Е.М. Холодкова, А.В. Пономарев, 2023