Detailed investigation of Phenol Degradation on Au/TiO2 Composite Materials

Tóth, Zsejke-Réka and Pap, Zsolt and Danciu, Virginia and Cosoveanu, Veronica and Baia, Lucian and Kovács, Gábor (2019) Detailed investigation of Phenol Degradation on Au/TiO2 Composite Materials. Journal of Nanoscience and Nanotechnology, 19. pp. 407-413. ISSN 1533-4880 (nyomtatott); 1533-4899 (online)

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Abstract

Photocatalytic applicability of different TiO2-based nanomaterials is a current hot topic. Therefore, our interest for the present research was to elucidate the formation of primary and secondary intermediates during the phenol degradation by photocatalysis, in the presence of Au/TiO2 nanocomposites. The composites consisted of differently shaped gold nanoparticles and commercial titania (Evonik Aeroxide P25). The obtained composites and the noble metal nanoparticles’ morphology was investigated by Transmission Electron Microscopy (TEM), their optical properties were explored using Diffuse Reflectance Spectroscopy (DRS), while the crystal structure was characterized by X-ray diffraction (XRD). The photocatalytic activity was investigated by photodegradation of phenol and methyl orange. In case of phenol it was shown that, the formation of degradation intermediates, was dependent on the Au nanoparticles’ shape, leading to high amounts of different intermediates as follows: hydroquinone for composites with spherical Au nanoparticles, 1,2,4-trihydroxy-benzene for triangle shaped nanoparticles, and pyrocatechol for TiO2.

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