Abstract
Thin films of pure TiO2, silver-deposited TiO2, and platinum-deposited TiO2 were prepared on quartz substrates by a dip-coating process for the photodecomposition of o-cresol under light emitting diodes (LEDs) irradiation instead of a traditional lamp. In this work, effects of noble metal doping, periodic illumination, and LEDs wavelength on the photoactivity, electrical energy consumption, and quantum yield were explored in an effort to better understand the roles of noble metal and LEDs characterization in photocatalytic reactions. Degradation of o-cresol under LED irradiation increased with the decreased wavelength of LEDs, due to the higher power energy of a photon. Pt/TiO2 films on quartz substrates prepared by a photodeposition method exhibited excellent optical characteristics, energy savings, and visible light–induced photocatalytic properties compared with Ag/TiO2 and pure TiO2 (P25). EEO increased from 22 to 31 kWh/m3/order indicating that energy consumption for periodic illumination was significantly lower than continuous illumination under similar experimental conditions. This study showed the feasible and potential use of LEDs in photocatalysis.
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