Photocatalytic ceramic membrane: Effect of the illumination intensity and distribution

“The principles and application of heterogeneous photocatalytic processes have gained wide attention, especially to the effectiveness of the process. In this work a mono and a multi-LED lamp are used to study the impact of the UV light intensity and distribution on the semiconductor surface during the degradation of organic compounds in water. A well-defined scan of the electromagnetic radiation profile on the surface of the membrane was obtained and evaluated. Comparing two lamp configurations with a total photon flux of 210 W.m−2 and using a filtration rate of 9.7 L.m−2.h−1, resulted in 20 % more degradation for the most homogeneous light distribution. Furthermore, the reaction rate relation to the photon flux was also studied, with a surface reaction model that includes possible mass transfer limitations. The surface reaction constant increased linearly with the irradiation intensity for the complete studied range [50 to 550 W.m−2] for the most homogeneous illumination distribution. A less uniform distribution resulted in a less than proportional reaction rate constant with respect to the incident photon flux between 100 and 210 W.m−2. This work adds valuable information to the photocatalysis field to improve the light efficiency in a photoreactor to enhance the degradation of pollutants.”

(Citation: Heredia Deba, S.A., Wols, B.A., et.al. – Photocatalytic ceramic membrane: Effect of the illumination intensity and distribution – Journal of Photochemistry and Photobiology A: Chemistry 437(2023)art. no. 114469 – DOI: 10.1016/j.jphotochem.2022.114469 – (Open Access))

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