The radiolysis of anthraquinone dye in aqueous solutions.

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The decoloration yields of an Acid Blue 40 neutral aqueous solution, G(-Dye), obtained from the optical density at 610 nm for the nitrogen-, oxygen-, and N2O-saturated solutions, equaled 0.18, 0.29, and 0.51 in the respective early stages. In view of the effects of NCS− and NO3− on the G(-Dye), the decoloration is attributable to the attacks of the OH radicals and hydrated electrons on the dye. The rate constants for the reactions of the OH radical and the hydrated electron with Acid Blue 40, obtained from competition reactions with various additives, were (6.6±1.2)×109 M−1s−1 and 1.5×1010 M−1s−1 respectively. In the nitrogen-saturated solutions, the G(-Dye) increased markedly upon the addition of alcohols–for example, up to 1.25 upon the addition of 2 mM butyl alcohol. In this case, at the same time, a new absorption band which is attributable to the formation of the reduction products by the attacks of the hydrated electrons and alcohol radicals on the dye appeared at 460–490 nm. This new absorption band disappeared slowly in the presence of oxygen; the rate of this disappearance was 2.8×10−5s−1. On the other hand, in the oxygen-saturated solutions, the G(-Dye) decreased markeld upon the addition of even a small amount of alcohol.
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