Abstract

CUBILLOS-LOBO, Jairo Antonio et al. Study of the visible light activity of Pt and Au-TiO ₂ photocatalysts in organic pollutants degradation. Rev.fac.ing.univ. Antioquia [online]. 2017, n.83, pp.20-30. ISSN 0120-6230.  https://doi.org/10.17533/udea.redin.n83a03.

Pt-TiO2 and Au-TiO2 photocatalysts were prepared by noble metal photodeposition on sulfated TiO2. It was observed that optical absorption, oxidation state and particle size of the metallic species (Pt or Au) play an important role in the TiO2 photocatalytic activity under visible-light irradiation. Photocatalytic activity of the bare TiO2 powder in the phenol and methyl orange degradation increased with the sulfation and metal addition. The highest degradation rate under UV-Visible and visible light irradiation was obtained on Pt-S-TiO2 photocatalyst; this is mainly due to the optical properties of TiO2 induced by platinization and also to the good distribution and low Pt particles size. It was also found that this catalyst has a good stability after two cycles of reaction in the phenol photodegradation under UV-Visible light irradiation. The Pt-S-TiO2 photocatalyst was also active under solar light and under the environmental conditions of the city of Tunja (Boyacá), Colombia.

Keywords : Pt-S-TiO₂; Au-S-TiO₂; UV-Visible; visible light; pollutants photodegradation.

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