مقاله Direct evaluation of the absorbed photon flow in a photocatalytic reactor by an actinometric method : تی پی بین

خلاصه مقاله

One of the most important questions to be answered when designing a photocatalytic system is related to the role of light in the process and how to model it in an accurate, simple and generic way. In this paper, experiments with a TiO₂ suspension in an actinometric solution (uranyl nitrate + oxalic acid) have been carried out. A cylindrical reactor and a tubular reactor irradiated by a Xenon lamp were used to perform the experiments. Thus, it was possible to evaluate the absorbed light. A probabilistic model is also presented. This model tries to explain and predict light behaviour when entering into the photocatalytic system. The experimental results obtained in the cylindrical reactor were fitted to the model and it was possible to estimate the probability of a photon to be absorbed by a TiO₂ particle after crashing it (P_abs). It is a TiO₂ pseudocharacteristic parameter. Thus, once it is determined and, if the same photocatalyst is used, P_abs would be able to be used in different systems. P_abs was estimated for different wavelengths ranges and was tested by applying the model to a tubular reactor for different catalyst concentrations, which means that the geometry of the system and the TiO₂ concentration were modified. Despite of the different conditions, the model was able to predict the system behaviour. The photon flow absorbed by TiO₂ is also presented.

نویسندگان

Bernardí Bayarri [ Departament d’Enginyeria Química, Facultat de Química, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain ]

Jaime Giménez [ Departament d’Enginyeria Química, Facultat de Química, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain ]

David Curcó [ Departament d’Enginyeria Química, Facultat de Química, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain ]

Santiago Esplugas [ Departament d’Enginyeria Química, Facultat de Química, Universitat de Barcelona, C/Martí i Franquès 1, 08028 Barcelona, Spain ]

کلمات کلیدی

Photocatalysis Radiation model Reactor modelling Pollutants treatment TiO2

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مشاهده مقالات

Chemical Engineering Journal

The Chemical Engineering Journal focuses upon three aspects of chemical engineering: chemical reaction engineering, environmental chemical engineering, and materials synthesis and processing.

حوزه های تحت پوشش : Chemical Engineering