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Report No.
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Radiation-induced reduction process of hazardous chromium(VI) ion to non-hazardous chromium oxide with the lower oxidation state in aqueous solution - oxide system

Nagaishi, Ryuji ; Yamada, Reiji; Hatano, Yoshihiko; Yoshida, Zenko

Radiation-induced reduction of chromium(VI) ion in aqueous solution was investigated in the presence of small amount of insoluble oxide particle such as TiO$$_{2}$$, Al$$_{2}$$O$$_{3}$$ and SiO$$_{2}$$ by using $$^{60}$$Co $$gamma$$-ray. Solution at pH $$>$$ 1.0, simulating industrial liquid waste, became neutral or basic by adding the oxide particle: the positive shift of pH of solution was dependent on the kind and particle size of oxide. The chromium(VI) ion was successfully reduced in the radiolysis of the neutral or basic solution in the presence of oxide, while not in the absence. These indicate that amount of chromium(VI) reduced by reducing radicals of water radiolysis is almost equal to that of chromium with the lower oxidation state oxidized by the oxidizing radicals in the solution, and that adsorption of chromium to oxide and enhancement in the reduction of chromium(VI) take place in the presence of oxide. The insoluble chromium(III) oxide formed in the reduction of chromium(VI) was also responsible for the reduction. The radiation-induced reduction process of hazardous chromium(VI) with utilizing high-level radioactive wastes as radiation resources was further discussed.

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