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Effect of Al$$_{2}$$O$$_{3}$$ nanoparticles on radiolytic H$$_{2}$$O$$_{2}$$ production in water

Roth, O.*; Hiroki, Akihiro; LaVerne, J. A.*

Hydrogen peroxide, H$$_{2}$$O$$_{2}$$, is the major stable oxidizing species produced in the radiolysis of water and understanding the mechanisms involved in its production is important both from a fundamental science perspective and for engineering purposes, in particular within the nuclear power industry. In this work, the yields of H$$_{2}$$O$$_{2}$$ were determined in aqueous slurries in the pH range of 1-13 with various amounts of added Al$$_{2}$$O$$_{3}$$ nanoparticles. The addition of Al$$_{2}$$O$$_{3}$$ generally decreased H$$_{2}$$O$$_{2}$$ yields at all pH values within this range in the $$gamma$$ radiolysis of both deaerated and aerated slurries, except at very high pH. Very little effect of pH was observed in the $$gamma$$ radiolysis of deaerated systems in the pH range of 3-8, whereas a large increase in H$$_{2}$$O$$_{2}$$ yields was observed in aerated Al$$_{2}$$O$$_{3}$$ slurries at the extreme pH values. Scavenger capacity studies using methanol as an OH radical scavenger show that the decrease in H$$_{2}$$O$$_{2}$$ yields with added Al$$_{2}$$O$$_{3}$$ occurs at relatively long time scales and is probably due to reaction of the solid nanoparticles with OH radicals.

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Category:Chemistry, Physical

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