Author(s)

Md. Ashraful Islam Molla¹, Ikki Tateishi¹, Mai Furukawa¹, Hideyuki Katsumata¹, Tohru Suzuki², Satoshi Kaneco^1,2

¹Department of Chemistry for Materials, Mie University, Mie, Japan.
²Mie Global Environment Center for Education and Research, Mie University, Mie, Japan.

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.

TiO₂, Photocatalytic Degradation, Visible Light, Dye-Sensitization, Reaction Mechanism

Islam Molla, M. , Tateishi, I. , Furukawa, M. , Katsumata, H. , Suzuki, T. and Kaneco, S. (2017) Evaluation of Reaction Mechanism for Photocatalytic Degradation of Dye with Self-Sensitized TiO₂ under Visible Light Irradiation. Open Journal of Inorganic Non-metallic Materials, 7, 1-7. doi: 10.4236/ojinm.2017.71001.