Abstract
The dye-sensitized TiO2 method is one of the most promising methods for the visible-light-induced detoxification of pollutants. The reaction mechanism for photocatalytic degradation of orange II (OII) and rhodamine B (RhB) with self-sensitized TiO2 under visible light irradiation (λ > 400 nm) has been evaluated. Radical scavenger studies were carried out to investigate the active species involved in the photodegradation of 5 mg/L of initial concentration of OII and RhB at room temperature. The trapping effects of different scavengers results proved that the oxidation of OII and RhB mainly occurred by the direct oxidization of h+ and ·O2- radicals, while the ·OH radicals played only a relatively minor role in the direct oxidization process.
Highlights
The dye-sensitization technique has been reported as an innovative technology that could play an important role in developing efficient and cost-effective semiconductor photocatalyst in the near future [1]
Radical scavenger studies were carried out to investigate the active species involved in the photodegradation of 5 mg/L of initial concentration of orange II (OII) and rhodamine B (RhB) at room temperature
The trapping effects of different scavengers results proved that the oxidation of OII and RhB mainly occurred by the direct oxidization of h+ and
Summary
The dye-sensitization technique has been reported as an innovative technology that could play an important role in developing efficient and cost-effective semiconductor photocatalyst in the near future [1]. It can extend the light absorption range, enhance photon harvesting efficiency, provide extra excited electron pairs from a dye and accelerate charge transfer, leading to a high efficiency of photoe-. The present study is intended to investigate the photocatalytic degradation reaction mechanism of orange II (OII) and rhodamine B (RhB) with self-sensitized TiO2 under the visible light irradiation (λ > 400 nm) and the possible mechanism is discussed based on radical trapping experiments
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