Study of the visible light activity of Pt and Au-Ti[O.sub.2] photocatalysts in organic pollutants degradation/Estudio de la actividad de los fotocatalizadores Pt and Au-Ti[O.sub.2] en la degradacion de contaminantes organicos bajo luz visible

• Published in: Revista Facultad de Ingeniería no. 83; p. 20
• Main Authors: Cubillos-Lobo, Jairo Antonio, Murcia-Mesa, Julie Joseane, Guarin-Romero, Jhonatan Ricardo, Rojas-Sarmiento, Hugo Alfonso, Hidalgo-Lopez, Maria del Carmen, Navio-Santos, Jose Antonio
• Format: Journal Article
• Language: Spanish
• Published: Universidad de Antioquia, Facultad de Ingenieria 01.06.2017
• Subjects: Estados Unidos
• ISSN: 0120-6230; 2422-2844
• DOI: 10.17533/udea.redin.n83a03

Pt-Ti[O.sub.2] and Au-Ti[O.sub.2] photocatalysts were prepared by noble metal photodeposition on sulfated Ti[O.sub.2]. It was observed that optical absorption, oxidation state and particle size of the metallic species (Pt or Au) play an important role in the Ti[O.sub.2] photocatalytic activity under visible-light irradiation. Photocatalytic activity of the bare Ti[O.sub.2] 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-Ti[O.sub.2] photocatalyst; this is mainly due to the optical properties of Ti[O.sub.2] 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-Ti[O.sub.2] photocatalyst was also active under solar light and under the environmental conditions of the city of Tunja (Boyaca), Colombia.