fig1

Figure 1. (A) The mechanism of photocatalytic stages: (1) light harvesting; (2) charge excitation; (3) charge separation; (4) charge recombination; (5) surface charge recombination; (6) reduction and (7) oxidation reaction; (B) Redox potential of U(VI) and common active species in photocatalytic; (C) Illustration of reaction mechanism with or without sacrificial reagent in uranium extraction.