Innovative and stable TiO2 supported catalytic surfaces removing aldehydes under UV-light irradiation

W. Elfalleh (1) , A. A. Assadi (2) , A. Bouzaza (2) , D. Wolbert (2) , J. Kiwi (3) , S. Rtimi (3)

1 Université de Gabès
2 ISCR - Institut des Sciences Chimiques de Rennes
3 EPFL - Ecole Polytechnique Fédérale de Lausanne

The present study reports the photocatalytic degradation of aldehydes using TiO2 impregnated polyester (PES) and glass fiber (GFT)-TiO2 addressing the photocatalytic degradation aldehydes (air-solid interface). The PES-TiO2 optical absorption was determined by diffuse reflectance spectroscopy (DRS). By X-ray diffraction (XRD), the formation of TiO2 anatase on the PES surface was detected. The photocatalytic oxidation (PCO) of butyraldehyde and isovaleraldehyde was carried out in a batch photo-reactor equipped with a UV-mercury Philips 9W lamp and mediated by glass fiber GFT-TiO2 and PES-TiO2 surfaces. The removal of these two aldehydes was found to be a function of pollutant concentrations. The stable catalytic reuse of both catalysts reported. A Langmuir Hinshelwood (L-H) model describes the degradation kinetics on PES-TiO2 and on GFF-TiO2. The aldehyde degradation by-products were analyzed by gas chromatography mass spectrometry (GC-MS). Three organics intermediates identified during the aldehyde degradation were: acetones, alcohols and fatty acids.

Mots clés: TiO2-PES; batch photo-reactor; kinetics; intermediate by-products; GC-MS; L-H isotherms; degradation kinetics

Domaines: Catalyse

W. Elfalleh, A. A. Assadi, A. Bouzaza, D. Wolbert, J. Kiwi, et al.. Innovative and stable TiO2 supported catalytic surfaces removing aldehydes under UV-light irradiation. Journal of Photochemistry and Photobiology A: Chemistry, 2017, 343, pp.96-102. ⟨10.1016/j.jphotochem.2017.04.029⟩. ⟨hal-01542761⟩