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国际标准刊号:ISSN 2096-6717
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Bi/BiOI可见光催化氧化去除NO的性能
幸小卜1, 王鑫雅2,3, 徐长长2,3, 董帆2,3
1.重庆大学 环境与生态学院, 重庆 400045;2.重庆工商大学 环境与资源学院;3.催化与环境新材料重庆市重点实验室, 重庆 400067
摘要:
催化机理是催化反应过程中的一大重要问题。为研究可见光催化氧化去除NO的反应机理,提高大气中NO去除效率,将BiOI中的Bi3+部分还原为金属Bi沉积在BiOI纳米片表面,合成Bi/BiOI纳米级微球光催化剂。通过一系列表征分析发现,金属Bi沉积在BiOI表面后,催化剂的微观结构和光学性质都有明显变化。与纯相的BiOI相比,制备的Bi/BiOI催化剂对气态NO表现出更优异的可见光催化去除活性。通过金属Bi的表面等离子体共振,引起高效可见光吸收和电子空穴对分离。同时,运用原位红外光谱动态监测Bi/BiOI光催化氧化NO的反应过程,结合自由基捕获结果,从分子层面揭示其反应产物,并结合表面等离子体共振提出Bi/BiOI光催化作用机理。
关键词:  Bi/BiOI  光催化  表面等离子效应  NO原位红外
DOI:10.11835/j.issn.2096-6717.2019.120
分类号:TU753
基金项目:
Photocatalytic activity for NO removal via the construction of Bi/BiOI photocatalyst
Xing Xiaobu1, Wang Xinya2,3, Xu Changchang2,3, Dong Fan2,3
1.College of Environment and Ecology, Chongqing University, Congqing 400045, P. R. China;2.College of Environment and Resources;3.Chongqing Key Laboratory of Catalysis and New Functional Materials, Chongqing Technology and Business University, Chongqing 400067, P. R. China
Abstract:
The catalytic mechanism is an important issue in catalytic reaction process. In order to enhance the photocatalytic efficiency of NO removal, we fabricate the Bi/BiOI nanos-phere photocatalyst via the in situ reduction of Bi3+ on the BiOI surface. Through a series of characterization analysis, we found the microstructure and optical properties of the catalyst changed significantly after the metal Bi was deposited on the surface of BiOI. Compared with pure BiOI, the prepared Bi/BiOI catalyst exhibited better photocatalytic activity for the removal of gaseous NO. Highly efficient visible light absorption and electron-hole pair separation are induced by surface plasmon resonance (SPR) of metal Bi. Meanwhile, by applying the in situ Diffuse Reflection Fourier Transform Infrared Spectrum (DRIFTS) and ESR spectra dynamically monitor the reaction process of Bi/BiOI photocatalytic oxidation of NO. Combining with the results of free radical capture, the reaction products were revealed from the molecular level. The mechanism of photocatalytic oxidation of NO by Bi/BiOI was proposed based on surface plasmon resonance (SPR).
Key words:  Bi/BiOI  photocatalysis  SPR  NO in situ DRIFTS
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