Abstract
The photocatalytic degradation of rhodamine B ( N, N, N′, N′-tetraethylrhodamine, RB) had been studied in a colloidal TiO 2 solution under both UV and visible light irradiation. Two different photodegradation processes of RB, photobleaching and N-deethylation, were examined in detail. The N-deethylation of RB was attributed to the oxidation by HOO · or OH · radicals generated from the dye-photosensitized and/or TiO 2 catalyzed reactions; while the photobleaching of RB was found to occur via dye cationic radical. The aromatic rings of RB cannot be destroyed in the absence of oxygen under visible light irradiation. Various additives, Fe 3+, EDTA, MV 2+, different atmosphere (O 2 and N 2), time-resolved laser flash photolysis and spin trapping electron paramagnetic resonance (ESR) were used to determine the possible mechanisms involved.
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