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The effects of Humic Acids (HA) on the photoinduced reduction of U(VI) in aqueous suspensions containing titanium dioxide particles was investigated by Time-Resolved Laser Induced Fluorescence in the pH range 5 to 7. The fluorescence response of both aqueous phase and adsorbed U(VI) species was also analyzed. The rate of the aqueous phase U(VI) photo-reduction was found to be enhanced by U(VI) complexation with HA. A photosensitising effect of HA on the interface reaction was evidenced at high irradiation intensity I with the HA pre-filter effect prevailing at low irradiation. A Kinetic model was developed, which takes into account U(VI) photo-reduction occurring both in the aqueous phase and at the semiconductor oxide -water interface, as well as adsorption and re-oxidation reactions.

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Authors: SELLI E, University of Milan (IT);ELIET V, JRC-Environment Institute, Ispra (IT);SPINI M, JRC-Environment Institute, Ispra (IT);BIDOGLIO G, JRC-Environment Institute, Ispra (IT)
Bibliographic Reference: Article published in: Environmental Science and Technology, 2000 pp 3742-3748
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