Abstract
The TiO 2-assisted photodegradation of anionic eosin has been examined in TiO 2 aqueous dispersions under illumination by visible light. Eosin is easily decomposed photochemically by visible light in the presence of TiO 2 particles. The degradation kinetics followed a Langmuir-Hinshelwood type equation. The rate was greater in acid media than in neutral and alkaline media, which correlates with the adsorption behavior of eosin on the TiO 2 surface. Adsorption of eosin is a prerequisite for the TiO 2-assisted photodegradation. The evolution of CO 2 occurred concomitantly with the photodegradation of eosin. A plausible mechanism of degradation is discussed.
Published Version
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