Photocatalytic activity of metal oxides-The role of holes and OH• radicals

被引：112
作者：
Guo, Mu Yao [1 ]
Ng, Alan Man Ching [1 ]
Liu, Fangzhou [1 ]
Djurisic, Aleksandra B. [1 ]
Chan, Wai Kin [2 ]
机构：
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 2011年 / 107卷 / 1-2期
关键词：
Photocatalysis; TiO2; ZnO; MgO; SINGLET MOLECULAR-OXYGEN; TIO2; PHOTOCATALYSIS; AQUEOUS SUSPENSIONS; SOLAR-CELLS; AZO DYES; N-OXIDE; DEGRADATION; ZNO; NANOPARTICLES; OXIDATION;
D O I：
10.1016/j.apcatb.2011.07.008
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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页码：150 / 157
页数：8
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