Li Yuhan, Yang Liping, Dong Guohui, Ho Wingkei
Department of Science and Environmental Studies, The Hong Kong Institute of Education, Tai Po, New Territories, Hong Kong, China.
Laboratory of Environmental Sciences and Technology, Xinjiang Technical Institute of Physics & Chemistry, and Key Laboratory of Functional Materials and Devices for Special Environments, Chinese Academy of Sciences, Urumqi 830011, China.
Molecules. 2015 Dec 26;21(1):E36. doi: 10.3390/molecules21010036.
Quantum dot (QD) sensitization can increase the light absorption and electronic transmission of photocatalysts. However, limited studies have been conducted on the photocatalytic activity of photocatalysts after modification by noble metal QDs. In this study, we developed a simple method for fabricating Pd-QD-modified g-C₃N₄. Results showed that the modification of Pd-QDs can improve the NO photocatalytic oxidation activity of g-C₃N₄. Moreover, Pd-QD modification changed the NO oxidation mechanism from the synergistic action of h⁺ and O₂(-) to the single action of ·OH. We found that the main reason for the mechanism change was that Pd-QD modification changed the molecular oxygen activation pathway from single-electron reduction to two-electron reduction. This study can not only develop a novel strategy for modifying Pd-QDs on the surface of photocatalysts, but also provides insight into the relationship between Pd-QD modification and the NO photocatalytic oxidation activity of semiconductor photocatalysts.
量子点（QD）敏化可以提高光催化剂的光吸收和电子传输。然而，关于贵金属量子点修饰后的光催化剂的光催化活性的研究有限。在本研究中，我们开发了一种制备钯量子点修饰的g-C₃N₄的简单方法。结果表明，钯量子点的修饰可以提高g-C₃N₄对NO的光催化氧化活性。此外，钯量子点修饰将NO氧化机理从h⁺和O₂(-)的协同作用转变为·OH的单一作用。我们发现机理改变的主要原因是钯量子点修饰将分子氧的活化途径从单电子还原转变为双电子还原。本研究不仅可以开发一种在光催化剂表面修饰钯量子点的新策略，还为深入了解钯量子点修饰与半导体光催化剂对NO的光催化氧化活性之间的关系提供了思路。
