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Effect of alumina on the enhancement of hydrogen production and the reduction of hydrogen peroxide in the $$gamma$$-radiolysis of pure water and 0.4M H$$_{2}$$SO$$_{4}$$ aqueous solution

純水及び0.4M H$$_{2}$$SO$$_{4}$$水溶液での$$gamma$$線による放射線分解におけるアルミナ添加による水素発生の促進効果と過酸化水素の抑制効果

山田 禮司; 熊谷 友多   ; 永石 隆二 

Yamada, Reiji; Kumagai, Yuta; Nagaishi, Ryuji

$$^{60}$$Co$$gamma$$線をアルミナ粉末添加の純水並びに0.4M H$$_{2}$$SO$$_{4}$$水溶液に室温で照射し、発生するH$$_{2}$$並びにH$$_{2}$$O$$_{2}$$を測定した。アルミナ添加量を増加すると、照射溶液のH$$_{2}$$O$$_{2}$$濃度は激減し、それに応じてH$$_{2}$$収量は増加した。これらの増加及び減少効果は照射済みのアルミナを使用した場合には小さくなるが、照射済み粉末を純水で洗浄すると、その効果は回復した。さらに、1-5kGy/hrの$$gamma$$線線量率領域では、0.4M H$$_{2}$$SO$$_{4}$$水溶液で水素収量が線量率の増加に伴い大きく増加した。これらの観測された現象は、添加したアルミナ粉末により照射溶液中のH$$_{2}$$O$$_{2}$$分子並びにOHラジカルの濃度が減少することで起こり、OHラジカルがアルミナ表面に吸着することに起因しているものと推察した。

The H$$_{2}$$ and H$$_{2}$$O$$_{2}$$ produced by $$^{60}$$Co $$gamma$$-radiation at room temperature were measured in pure water and 0.4M H$$_{2}$$SO$$_{4}$$ aqueous solution with alumina powder. By increasing the addition of alumina powder, a strong reduction of H$$_{2}$$O$$_{2}$$ concentrations in the solutions was obtained, and the final product H$$_{2}$$ yields were correspondingly enhanced. These enhancement and reduction effects were diminished in the subsequent $$gamma$$-radiation when irradiated alumina powder was used. The effects were reversibly restored by washing the irradiated powder with purified water. In 0.4M H$$_{2}$$SO$$_{4}$$ solution with alumina powder, the H$$_{2}$$ yields increased by increasing the absorbed dose rate in the region of 1-5 kGy/hr. The radiation-enhanced H$$_{2}$$ production correlated with the reduction of H$$_{2}$$O$$_{2}$$ concentration could be brought about by the reduction of H$$_{2}$$O$$_{2}$$ molecules and OH radicals in the solutions due to alumina powder.

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パーセンタイル:22.28

分野:Chemistry, Physical

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