Development of Plasmonic Photocatalysts for Environmental Application

Abstract:

Regarding catalytic and plasmonic properties of gold nanoparticles (NPs), the novel area of research on photocatalytic gold properties has been recently started. In contrast with catalytically active gold NPs, where nanosized gold is recommended, our results showed that polydispersity of deposited gold NPs on semiconducting support was beneficial for photocatalytic activity under visible light irradiation. It is thought that wide size/shape distribution of gold NPs, and thus the ability of absorption of light in a wide wavelengths range is responsible for the high level of photoactivity. Though desirable absorption properties of plasmonic photocatalysts can be easily obtained by preparation of nanoparticles of different sizes and shapes, their photocatalytic activities under visible light irradiation are still low and should be enanced. The improvement of photocatalytic activities under visible light irradiation was achieved by enlargement of interfacial contact between titania and NPs of noble metals, extension of photoabsorption ranges (by preparation of NPs of various sizes and shapes or composed of two kinds of noble metals), and by deposition of noble metals NPs on faceted titania, i.e., octahedral (OAPs) and decahedral (DAPs). Plasmonic photocatalysts composed of titania and NPs of silver, gold or copper showed also high antiseptic properties under visible light irradiation, due to possible synergism of antiseptic properties of noble metals and photodisinfection properties of photocatalyst, since reactive oxygen species or photogenerated holes are formed on the surface of irradiated semiconductor.

• Periodical: Advances in Science and Technology (Volume 93)
• Pages: 174-183
• DOI: https://doi.org/10.4028/www.scientific.net/AST.93.174
• Online since: October 2014
• Authors: Ewa Kowalska*, Zhi Shun Wei, Baris Karabiyik, Marcin Janczarek, Maya Endo, Kun Lei Wang, Paulina Rokicka, Agata Markowska-Szczupak, Bunsho Ohtani
• Keywords: Antiseptic Properties, Decahedral Titania, Modified Titania, Nanoparticles of Gold, Octahedral Titania, Plasmonic Photocatalysts, Pollutants Degradation, Silver and Copper, Visible Light Activity

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