Photocatalytic and photochemical processes on the surface of uranyl-modified oxides: An in situ XPS study

[Display omitted] •The lability of uranium on the surface of porous supports correlates with the photocatalytic activity under visible light.•A fast and reversible two-electron transition (U6+ ↔ U4+) occurs on TiO2 under visible light and exposure to oxygen.•A slower and only one-electron transition...

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