1. Optical Properties and Quantum Yield Determination in Photocatalytic Suspensions.
- Author
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Loddo, V., Addamo, M., Augugliaro, V., Palmisano, L., Schiavello, M., and Garrone, E.
- Subjects
PHOTOCATALYSIS ,CATALYSIS ,ABSORPTION ,SCATTERING (Physics) ,TITANIUM dioxide - Abstract
Knowledge of the optical properties of photocatalytic suspensions is vital for a correct comparison of their energetic efficiency. In this work, the determination of both absorption and scattering coefficients of aqueous suspensions of commercial TiO
2 powders irradiated by monochromatic light was carried out by measuring only one quantity--the transmitted photon flow--as a function of the catalyst mass and by applying an asymptotic form of the Kubelka-Munk solution of the radiative transfer equation. Applying a nonlinear fitting procedure the evaluation of the actual values of absorption and scattering coefficients was carried out. The limit for optically thick media of the Kubelka-Munk equation is shown to assume the form of a standard Lambert-Beer absorption formula. The determination of absorbed photon flow was then used to determine the quantum yield value for the phenol photocatalytic oxidation reaction. [ABSTRACT FROM AUTHOR]- Published
- 2006
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