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无机材料学报

无机材料学报 ›› 2020, Vol. 35 ›› Issue (11): 1255-1262.DOI: 10.15541/jim20200024

所属专题： 环境材料论文精选(2020)

• 研究论文 • 上一篇    下一篇

BiOBr-BN光催化氧化NO及其抑制毒副产物的机理研究

郑倩1, 2, 曹玥晗2, 黄南建2, 董帆3, 周莹1, 2   

  1. 1. 西南石油大学 油气藏地质及开发工程国家重点实验室, 成都 610500;
    2. 西南石油大学 材料科学与工程学院, 新能源材料及技术研究中心, 成都 610500;
    3. 电子科技大学 基础与前沿研究院, 环境科学与技术研究中心, 成都 611731
  • 收稿日期:2020-01-13 修回日期:2020-04-07 出版日期:2020-11-20 网络出版日期:2020-04-05
  • 作者简介:郑 倩(1996-), 女, 硕士研究生. E-mail: qianzhengswpu@163.com.
  • 基金资助:
    国家自然科学基金石油化工联合基金(U1862111); 成都市国际科技合作项目(2017-GH02-00014-HZ); 西南石油大学第十九期(2019-2020学年)大学生课外开放实验重点项目(KSZ19516); National Natural Science Foundation of China (U1862111); International Collaboration Project of Chengdu City (2017-GH02-00014-HZ); College Students’ Extracur-Ricular Open Experiment Project of SWPU, China (KSZ19516)

BiOBr-BN Photocatalysts for Promoting Photocatalytic NO Oxidation and Inhibiting Toxic By-products

ZHENG Qian1, 2, CAO Yuehan2, HUANG Nanjian2, DONG Fan3, ZHOU Ying1, 2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China;
    2. The Center of New Energy Materials and Technology, School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, China.
    3. Research Center for Environmental Science &Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China;
  • Received:2020-01-13 Revised:2020-04-07 Published:2020-11-20 Online:2020-04-05
  • About author:ZHENG Qian(1996-), female, Master candidate. E-mail: qianzhengswpu@163.com

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摘要： 光催化去除一氧化氮(NO)是一种新兴的空气净化技术, 但极易生成毒副产物二氧化氮(NO2), 限制了其实际应用。为解决这一问题, 本研究以氮化硼(BN)纳米片为模板, 用原位生长法在其表面形成溴氧铋(BiOBr)纳米片, 成功构建二维-二维(2D-2D)可见光催化剂BiOBr-BN。根据X射线光电子能谱及第一性原理计算结果, BiOBr通过界面作用将电子转移至BN, 形成内建电场, 有效促进光生载流子的分离。BiOBr作为NO氧化的活性面, 增强氧气(O2)的吸附和活化, 抑制NO2的生成。可见光催化氧化NO性能测试结果表明, 5%BiOBr复合BN后, NO去除率从24.6%提高到39.5%, NO3-的氧化选择性从36.6%提高到82.7%。

关键词: 溴氧铋, 氮化硼, 光催化, 一氧化氮, 毒副产物

Abstract: Photocatalysis has been regarded as an emerging and promising air purification technology. However, nitrogen dioxide (NO2) as the by-product is easily generated in the process of photocatalytic NO oxidation, which is more toxic and harmful to human health than NO. To inhibit the generation of NO2 and promote the deep oxidation of No into nitrate (NO3-), boron nitride (BN) nanosheets was used as templates and bismuth oxybromide (BiOBr) nanosheets were introduced by the in-situ growth method to fabricate the two dimensional-two dimensional (2D-2D) BiOBr-BN photocatalysts. After introducing the BN nanosheets, the thickness and diameter of BiOBr nanosheets greatly decrease. At the same time, the specific surface area of 5% BiOBr-BN increases nearly by 15 times compared with the pure BiOBr nanosheets, which could provide more active sites for the reaction. According to the photocatalytic NO removal tests, the composites present the higher photocatalytic activity than pure BiOBr nanosheets and BN nanosheets. Among them, 5% BiOBr-BN sample reveals the best NO removal rate of 39.5%, which is higher than that of pure BiOBr nanosheets (24.6%) under visible light irradiation. More importantly, the NO2 generation rate is suppressed from 16.4% to 7% and the oxidation selectivity of NO3- is increased from 36.6% to 81.5% compared with the pure BiOBr nanosheets. On the one hand, there is a strong interfacial interaction between BiOBr nanosheets and BN nanosheets, identifying by the X-ray Photoelectron Spectroscopy (XPS) and Density Functional Theory (DFT) results. Hence, 0.98 e electrons transfer from BiOBr to BN through the interface area, resulting in the formation of built-in electric field. Benefiting from this, the recombination of photogenerated charge carriers is effectively inhibited. On the other hand, BiOBr as the active surface enhances the adsorption of O2 and promotes its activation to superoxide radicals (•O2-), which is proved by DFT and Electron Spin Resonance (ESR) results. As a result, the generation of toxic by-product NO2 is effectively inhibited and NO can be directly oxidized into NO3-. These findings could provide a facial strategy for the design of 2D-2D photocatalysts and control of the separation of photo-generated electrons and holes.

Key words: bismuth oxybromide, boron nitride, photocatalysis, nitric oxide, toxic byproduct

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