Bi12O17Br2和Bi4O5Br2纳米片的简易制备及光催化氧化NO机理的原位漫反射红外光谱研究

引用本文: 张文东, 刘晓莉, 董兴安, 董帆, 张育新. Bi₁₂O₁₇Br₂和Bi₄O₅Br₂纳米片的简易制备及光催化氧化NO机理的原位漫反射红外光谱研究[J]. 催化学报, 2017, 38(12): 2030-2038. doi: 10.1016/S1872-2067(17)62941-3 shu

Citation: Wendong Zhang, Xiaoli Liu, Xing'an Dong, Fan Dong, Yuxin Zhang. Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway[J]. Chinese Journal of Catalysis, 2017, 38(12): 2030-2038. doi: 10.1016/S1872-2067(17)62941-3 shu

Bi₁₂O₁₇Br₂和Bi₄O₅Br₂纳米片的简易制备及光催化氧化NO机理的原位漫反射红外光谱研究

a 重庆大学材料科学与工程学院, 重庆 400044;
b 重庆师范大学科研处, 重庆 401331;
c 重庆工商大学环境与资源学院, 重庆市催化与功能有机分子重点实验室, 重庆 400067
基金项目:
国家自然科学基金（51708078，21576034）；重庆市博士后科学基金（Xm2016027）；重庆市高校创新团队（CXTDG201602014，CXTDX201601016）.

摘要: BiOBr因具有合适的能带结构和独特的层状纳米结构而广泛应用于可见光催化领域，但其低的可见光利用率和高的光生电子-空穴对复合率，限制了其实际应用.最近，非整比BiOBr纳米材料表现出了良好的可见光催化性能.本课题组分别采用简易水热法和常温法制备得Bi₁₂O₁₇Br₂和Bi₄O₅Br₂纳米片，并表现出良好的可见光催化性能.然而，对于Bi₁₂O₁₇Br₂和Bi₄O₅Br₂的可见光催化氧化NO的转化路径及反应机理还不清楚.基于此，本文采用射线衍射（XRD）、扫描电镜（SEM）、透射电镜（TEM）、紫外-可见漫反射光谱（UV-Vis DRS）、电子自旋共振（ESR）、电子顺磁共振（EPR）和比表面积-孔结构（BET-BJH）等手段研究了Bi₁₂O₁₇Br₂和Bi₄O₅Br₂的理化性能，通过原位红外光谱（in situ DRIFTS）研究了Bi₁₂O₁₇Br₂和Bi₄O₅Br₂的可见光催化氧化NO的转化路径及反应机理.
XRD结果表明，在常温碱性环境下，OH^-离子逐步取代BiOBr中的Br^-离子制备得单斜晶相Bi₄O₅Br₂；在水热碱性环境下，OH^-离子进一步取代Bi₄O₅Br₂中的Br^-离子制备得四方晶相Bi₁₂O₁₇Br₂.SEM和TEM结果表明，Bi₁₂O₁₇Br₂是由不规则纳米片堆叠形成的紧密且厚实的层状结构，Bi₄O₅Br₂是由纳米片和纳米颗粒无序堆积形成的多孔疏松结构.BET-BJH测试结果显示，Bi₄O₅Br₂的比表面积和孔容（37.2 m²/g，0.215 cm³/g）显著高于Bi₁₂O₁₇Br₂（8.7 m²/g，0.04 cm³/g）.UV-Vis DRS测试结果显示，Bi₁₂O₁₇Br₂和Bi₄O₅Br₂均显示了良好的可见光吸收能力.可见光催化去除NO的测试结果表明，Bi₄O₅Br₂（41.8%）的光催化活性明显高于Bi₁₂O₁₇Br₂（28.3%）.并且，在5次可见光催化循环实验后，Bi₄O₅Br₂（41.1%）表现出良好可见光催化稳定性.ESR测试结果表明，Bi₁₂O₁₇Br₂和Bi₄O₅Br₂参与反应的主要活性物种均为·OH自由基，Bi₄O₅Br₂产生·OH自由基明显强于Bi₁₂O₁₇Br₂.EPR测试结果表明，Bi₄O₅Br₂的氧空位明显多于Bi₁₂O₁₇Br₂，丰富的氧空位更有利于NO的有效吸附.由此可见，Bi₁₂O₁₇Br₂和Bi₄O₅Br₂表现出不同的理化特性.
可见光催化氧化NO的原位红外光谱表明，只在Bi₁₂O₁₇Br₂光催化氧化NO的转化路径中会生成中间产物N₂O₃，表明Bi₁₂O₁₇Br₂和Bi₄O₅Br₂具有不同的NO光催化转化路径.结合上述表征结果认为，Bi₄O₅Br₂比Bi₁₂O₁₇Br₂表现出更优异可见光催化性能的主要原因有以下四个方面为：（1）Bi₄O₅Br₂拥有更高的比表面积和更大的孔容，有利于NO的吸附、反应中间产物的转移和提供更多的活性位点参与光催化反应；（2）Bi₄O₅Br₂可以生成更多的·OH自由基和拥有更强的价带空穴氧化能力；（3）NO中的O原子可以与Bi₄O₅Br₂的氧空位结合，从而提供更多的反应位点；（4）Bi₄O₅Br₂的光催化反应中可以生成中间产物N₂O₃，可以降低NO转化成NO₃^-的反应活化能.

关键词:

English

Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway

a College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
b Department of Scientific Research Management, Chongqing Normal University, Chongqing 401331, China;
c Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
Received Date: 23 September 2017
Revised Date: 26 October 2017
Fund Project:
This work is supported by the National Natural Science Foundation of China (51708078, 21576034), Chongqing Postdoctoral Science Foundation funded project (Xm2016027), the Innovative Research Team of Chongqing (CXTDG201602014, CXTDX201601016).

Abstract: Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ visible-light driven photocatalysts, were respectively fabricated by hydrothermal and room-temperature deposition methods with the use of BiBr₃ and NaOH as precursors. Both Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ were composed of irregular nanosheets. The Bi₄O₅Br₂ nanosheets exhibited high and stable visible-light photocatalytic efficiency for ppb-level NO removal. The performance of Bi₄O₅Br₂ was markedly higher than that of the Bi₁₂O₁₇Br₂ nanosheets. The hydroxyl radical (·OH) was determined to be the main reactive oxygen species for the photo-degradation processes of both Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂. However, in situ diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ featured different conversion pathways for visible light driven photocatalytic NO oxidation. The excellent photocatalytic activity of Bi₄O₅Br₂ resulted from a high surface area and large pore volumes, which facilitated the transport of reactants and intermediate products, and provided more active sites for photochemical reaction. Furthermore, the Bi₄O₅Br₂ nanosheets produced more ·OH and presented stronger valence band hole oxidation. In addition, the oxygen atoms of NO could insert into oxygen-vacancies of Bi₄O₅Br₂, which provided more active sites for the reaction. This work gives insight into the photocatalytic pollutant-degradation mechanism of bismuth oxyhalide.

Key words:

Bi₁₂O₁₇Br₂
/ Bi₄O₅Br₂
/ In situ diffuse reflectance infrared Fourier transform spectroscopy investigation
/ Conversion pathway
/ NO oxidation

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Bi₁₂O₁₇Br₂和Bi₄O₅Br₂纳米片的简易制备及光催化氧化NO机理的原位漫反射红外光谱研究

English

Facile synthesis of Bi₁₂O₁₇Br₂ and Bi₄O₅Br₂ nanosheets: In situ DRIFTS investigation of photocatalytic NO oxidation conversion pathway

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