光催化
材料科学
表面等离子共振
等离子体子
可见光谱
纳米颗粒
带隙
光化学
光电子学
纳米技术
化学
催化作用
有机化学
作者
Wei Zhao,Yang Guo,Yasir Faiz,Wenting Yuan,Chao Sun,Shaomang Wang,Yulin Deng,Yuan Zhuang,Yong Li,Xiaomeng Wang,Huan He,Shaogui Yang
标识
DOI:10.1016/j.apcatb.2014.08.015
摘要
The novel one-dimension Ag/AgVO3 plasmonic photocatalysts were synthesized via in situ reduction of AgVO3 by NaBH4 at room temperature. The morphologies, optical properties and electronic structures of the synthesized Ag/AgVO3 plasmonic photocatalysts were systematically characterized using a combination of theoretical calculations and experimental techniques. The photocatalytic activities of Ag/AgVO3 photocatalysts were evaluated using photocatalytic degradation of basic fuchsin (BF) dye. The results showed that the photocatalytic efficiency of Ag/AgVO3 was better than that of AgVO3. Ag/AgVO3 demonstrated a high photocatalytic activity with 93.6% of BF decomposed within 90 min. Such enhanced photocatalytic performance could be attributed to the relatively high conductivity and electron-storing capacity of Ag nanoparticles coated on AgVO3 surfaces. These Ag nanoparticles facilitate charge transfer between AgVO3 and Ag nanoparticles, and induce the localized surface plasmon resonance (SPR) that increases electric field and absorption of visible light. The results of the FDTD simulation confirmed that the SPR and the electric field enhancement were caused by the Ag nanoparticles. The theoretical calculation based on DFT indicates that Ag formed could narrow the bandgap of AgVO3 due to the fact that the Ag 5s orbital by association with Ag nanoparticles moves down the CB after hybridization. Meanwhile, the hybridization of O 2p and Ag 4d orbits of Ag/AgVO3 is weak, which is beneficial for valence band electrons to excite into the conduction band. The combined experimental results and characterizations of Ag/AgVO3 suggest that h+ and O2− are the main reactive species for degradation of BF in the visible light-catalyzed oxidation.
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