Photocatalytic activity of metal oxides-The role of holes and OH• radicals
Photocatalytic activity of metal oxides-The role of holes and OH• radicals
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DOI：
10.1016/j.apcatb.2011.07.008
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发表时间：
2011-08-31
影响因子：
22.1
通讯作者：
Chan, Wai Kin
中科院分区：
文献类型：
--
作者：
Guo, Mu Yao;Ng, Alan Man Ching;Chan, Wai Kin
我们研究了不同的金属氧化物纳米颗粒（TiO 2，ZnO和MgO）在溶液中，环境和真空环境中对四种不同染料的光催化活性。所考虑的金属氧化物材料在水溶液中产生不同的活性氧物种，并表现出不同的光催化活性。我们没有发现光催化活性和超氧离子的产生之间的相关性。OH中心点自由基的存在有助于染料的降解，但这种贡献的程度取决于染料的化学结构。在本研究中考虑的实验条件下，主要的降解机制被认为是从金属氧化物半导体的直接电荷转移。(C)2011爱思唯尔有限公司版权所有。
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.