光催化
可见光谱
材料科学
表面等离子共振
光化学
纳米复合材料
等离子体子
选择性
纳米颗粒
氧气
退火(玻璃)
半导体
催化作用
化学工程
纳米技术
光电子学
化学
有机化学
复合材料
工程类
作者
Yanyan Duan,Mei Zhang,Lan Wang,Fu Wang,Liping Yang,Xiyou Li,Chuanyi Wang
标识
DOI:10.1016/j.apcatb.2016.11.023
摘要
Integration of semiconductors with plasmonic noble metal nanoparticles for visible- light driven photocatalysis has become an interesting research field recently. In this work, Ag-TiO2 − x nanocomposites were successfully synthesized via a facile photochemical reduction process followed by post-annealing. The deposition of Ag nanoparticles greatly increases the light absorption and charge separation. Compared with commercial P25, the Ag-TiO2 − x nanocomposites are not only superior in visible-light photocatalytic NO removal, but also in inhibiting the production of NO2, whose toxicity is 4–5 times higher than NO. As confirmed by gas chromatography, the photo-oxidation of NO and selective photo-reduction of NO to N2 occur simultaneously during the process of NO removal by Ag-TiO2 − x. The oxidation of NO was due to the synergic effect between h+ and O2−; while the selective photo-reduction was resulted from introduced oxygen vacancies in TiO2. In addition, the light wavelength dependence measurement reveals that the surface plasmon resonance effect of Ag is responsible for the improvement of the visible-light photoactivity. The present study will provide an alternative approach to design highly selective photocatalysts for NO removal under visible-light.
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