Abstract
In the paper the ability of CeO2-x nanoparticles (nanoceria) to inactivate free radicals formed during water photolysis under UV irradiation is shown. UV irradiation of nanoparticles with sizes less than 10 nm in the aqueous medium promotes Ce4+ → Ce3+ reduction, and after the cessation of irradiation Ce3+ → Ce4+ reverse process is observed. The displacement of Ce3+⇄Ce4+ equilibrium in one direction or another occurs with time delay. Pre-irradiated nanoparticles in hydrosols are more active antioxidants than unirradiated ones. A possible mechanism of the antiradical action of nanoceria in aqueous solutions under UV irradiation was proposed.
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Schedule a callMore From: Journal of Photochemistry & Photobiology, A: Chemistry
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