Simulation of the photocatalytic removal of stearic acid discrete deposits on the surface of a non-porous titania thin film
Résumé
We apply a kinetic model to simulate the photocatalytic removal of stearic acid (SA) discrete deposits. At the microscopic scale, the SA deposit is modelled as a set of hundreds of squared islands deposited on the TiO2 surface and separated from each other. The input data include the projected areas and heights of the islands both characterized by a Gaussian distribution law with a mean value and various standard deviations. The effects of these parameters are examined, analyzed and put in relation with experimental results from the literature. The dependence of the removal kinetics of the SA deposits on its initial microstructure is clearly demonstrated. Additionally, we show that the removal kinetics of the SA deposit as measured by infrared spectroscopy can be satisfactory predicted from the distributions of the initial projected areas of the islands and their heights as measured by optical microscopy and atomic force microscopy.
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