INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Analysis of Photocatalytic Reactors Employing the Photonic Efficiency and the Removal Efficiency Parameters: Degradation of Radiation Absorbing and Non-Absorbing Pollutants
Autor/es:
SAGAWE, G.; SATUF, M.L.; BRANDI, R.J.; MUSCHNER, J.; FEDERER, C.; ALFANO, O.M.; BAHNEMANN, D.; CASSANO, A.E.
Revista:
INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2010 vol. 49 p. 6898 - 6908
ISSN:
0888-5885
Resumen:
The
photocatalytic degradation of radiation absorbing and nonabsorbing pollutants
in slurry reactors is analyzed in terms of two performance parameters: the
obserVed photonic efficiency (OPE) and the remoVal efficiency (RE) [Sagawe et
al. Chem. Eng. Sci. 2003, 58,
2587]. The OPE proposal
permits a simple approach to analyze complex reacting systems. Conversely, to
calculate the RE, the modeling of radiation absorption and scattering inside
the reactors is necessary, which requires the determination of the optical
properties of the catalyst and the modeling of the optical effects of the
reactor walls. The degradation of dichloroacetic acid, phenol, and 4-nitrophenol
was studied employing aeroxide TiO2 P25 from Evonik-Degussa in well-mixed batch
reactors irradiated by UV lamps. 4-Nitrophenol has the particular
characteristic to compete with titania for the absorption of photons in the
employed wavelength range of irradiation. Two reaction kinetics proposals were
considered to interpret experimental data: a photocatalytic
Langmuir-Hinshelwood model (the L-HPh model) and a photocatalytic
Langmuir-Hinshelwood linear model (the L-HPh/1 model). The good agreement
observed between experimental results and model simulations confirms the
usefulness of the proposed OPE approximation and the more accurate information
provided by the RE performance parameter. The inclusion of 4-nitrophenol allowed
inference of the situation that would be encountered when treating real samples
contaminated with strong radiation absorbing compounds.