The effects of humic acids (HA) on the photoinduced redn. of U(VI) in aq. suspensions contg. TiO2 particles was studied by time-resolved laser induced fluorescence in the pH range 5 to 7. The fluorescence response of both aq. phase and adsorbed U(VI) species was also analyzed. The rate of the aq. phase U(VI) photoredn. is enhanced by U(VI) complexation with HA. A photosensitizing effect of HA on the interface reaction was evidenced at high irradn. intensity, with the HA prefilter effect prevailing at low irradn. A kinetic model was developed, which takes into account U(VI) photoredn. occurring both in the aq. phase and at the semiconductor oxide-H2O interface as well as adsorption and reoxidn. reactions.
Effects of Humic Acids on the Photoinduced Reduction of U(VI) in the Presence of Semiconducting TiO2 Particles / E. Selli, V. Eliet, M.R. Spini, G. Bidoglio. - In: ENVIRONMENTAL SCIENCE & TECHNOLOGY. - ISSN 0013-936X. - 34:17(2000), pp. 3742-3748.
Effects of Humic Acids on the Photoinduced Reduction of U(VI) in the Presence of Semiconducting TiO2 Particles
E. SelliPrimo
;
2000
Abstract
The effects of humic acids (HA) on the photoinduced redn. of U(VI) in aq. suspensions contg. TiO2 particles was studied by time-resolved laser induced fluorescence in the pH range 5 to 7. The fluorescence response of both aq. phase and adsorbed U(VI) species was also analyzed. The rate of the aq. phase U(VI) photoredn. is enhanced by U(VI) complexation with HA. A photosensitizing effect of HA on the interface reaction was evidenced at high irradn. intensity, with the HA prefilter effect prevailing at low irradn. A kinetic model was developed, which takes into account U(VI) photoredn. occurring both in the aq. phase and at the semiconductor oxide-H2O interface as well as adsorption and reoxidn. reactions.
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