Study of the visible light activity of Pt and Au-TiO2 photocatalysts in organic pollutants degradation

Keywords: Pt-S-TiO2, Au-S-TiO2, UV-visible, Visible light, Pollutants photodegradation

Abstract

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

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Author Biographies

Jairo Antonio Cubillos-Lobo, Pedagogical and Technological University of Colombia

Associate Professor. Catalysis Group, School of Chemical Sciences, Faculty of Sciences.

Julie Joseane Murcia-Mesa, Pedagogical and Technological University of Colombia

Assistant Teacher. Catalysis Group, School of Chemical Sciences, Faculty of Sciences.

Jhonatan Ricardo Guarín-Romero, Pedagogical and Technological University of Colombia

Catalysis Group, School of Chemical Sciences.

Hugo Alfonso Rojas-Sarmiento, Pedagogical and Technological University of Colombia

Professor. Catalysis Group, School of Chemical Sciences, Faculty of Sciences.

María del Carmen Hidalgo-López, University of Seville

Seville Institute of Materials Science (ICMS), Higher Council for Scientific Research CSIC.

José Antonio Navío-Santos, University of Seville
Seville Institute of Materials Science (ICMS), Higher Council for Scientific Research CSIC.

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Published
2017-06-26
How to Cite
Cubillos-Lobo J. A., Murcia-Mesa J. J., Guarín-Romero J. R., Rojas-Sarmiento H. A., Hidalgo-López M. del C., & Navío-Santos J. A. (2017). Study of the visible light activity of Pt and Au-TiO2 photocatalysts in organic pollutants degradation. Revista Facultad De Ingeniería Universidad De Antioquia, (83), 20-30. https://doi.org/10.17533/udea.redin.n83a03