Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 107, Issue 1-2, Pages 150-157Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2011.07.008
Keywords
Photocatalysis; TiO2; ZnO; MgO
Funding
- RGC CRF [CityU6/CRF/08]
- University Development Fund
- University of Hong Kong
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We have studied the photocatalytic activity of different metal oxide nanoparticles (TiO2, ZnO, and MgO) on four different dyes in solution, ambient and vacuum environments. The metal oxide materials considered generated different reactive oxygen species in aqueous solutions and exhibited different photocatalytic activity. We found no correlation between the photocatalytic activity and superoxide ion generation. The presence of the OH center dot radicals contributed to the dye degradation, but the extent of this contribution was dependent on the chemical structure of the dye. The predominant degradation mechanism was found to be direct charge transfer from the metal oxide semiconductor for the experimental conditions considered in this study. (C) 2011 Elsevier B.V. All rights reserved.
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