INVESTIGADORES
ALFANO Orlando Mario
artículos
Título:
Absolute Quantum Yields in Photocatalytic Slurry Reactors
Autor/es:
BRANDI, R.J.; CITRONI, M.A.; ALFANO, O.M.; CASSANO, A.E.
Revista:
CHEMICAL ENGINEERING SCIENCE
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2003 vol. 58 p. 979 - 985
ISSN:
0009-2509
Resumen:
Photocatalysis
in slurry reactors have the particular characteristic that the reacting medium
not only absorbs but also scatters photons and both phenomena occurs simultaneously.
When this is the case, typical methods used in classical photochemistry such as
homogeneous actinometry are useless because they cannot take into account
radiation scattering. Consequently present methods in use always underestimate quantum
yields calculations. A method has been developed to produce absolute values of
photocatalytic quantum yields in slurry reacting systems employing titanium
dioxide and near UV radiation. The new procedure resorts to the rigorous
solution of the radiative transfer equation inside the reaction space in order
to obtain the true value of the photonic absorption rate. Employing
monochromatic light, values for the photocatalytic decomposition of phenol and
1,4-dioxane are reported under precisely defined conditions. The method can be
used to compare reactivities of different catalysts or, for a given catalyst,
reactivities with different compounds regardless the reactor shape, size or configuration.