高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (9): 20240187.doi: 10.7503/cjcu20240187

• 物理化学 • 上一篇    下一篇

基于氯自由基链式反应的臭氧可见光消除研究

赵子旺1, 丛树睿2, 王春宇1, 周术元1, 彭猛3, 王磊1(), 许嘉钰3()   

  1. 1.国民核生化灾害防护国家重点实验室, 北京 102205
    2.华南理工大学制浆造纸工程国家重点实验室, 广州 510640
    3.清华大学环境学院, 北京 100084
  • 收稿日期:2024-04-12 出版日期:2024-09-10 发布日期:2024-07-15
  • 通讯作者: 王磊,许嘉钰 E-mail:wanglei16@tsinghua.org.cn;jiayu_tsinghua@163.com
  • 基金资助:
    国民核生化灾害防护国家重点实验室基金(SKLNBC 2022-03)

Study of Ozone Elimination via Chlorine Radical Chain Reaction Under Visible Light

ZHAO Ziwang1, CONG Shurui2, WANG Chunyu1, ZHOU Shuyuan1, PENG Meng3, WANG Lei1(), XU Jiayu3()   

  1. 1.State Key Laboratory of NBC Protection for Civilian,Beijing 102205,China
    2.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China
    3.School of Environment,Tsinghua University,Beijing 100084,China
  • Received:2024-04-12 Online:2024-09-10 Published:2024-07-15
  • Contact: WANG Lei, XU Jiayu E-mail:wanglei16@tsinghua.org.cn;jiayu_tsinghua@163.com
  • Supported by:
    the Foundation of State Key Laboratory of NBC Protection for Civilian, China(SKLNBC 2022-03)

摘要:

随着地球大气中臭氧(O3)浓度的逐年升高, 臭氧已成为大气污染治理的一个重要污染物. 羟基自由基光催化反应对臭氧消除性能偏低, 仅提高羟基自由基产量的改性方法已不适用于臭氧光催化消除. 本文 以Bi2WO6为基础, 先后进行了Fe掺杂以及TiO2负载, 制备了一系列Fe-Bi2WO6@TiO2复合材料, 并对复合材料进行了物性表征及臭氧催化活性测试. 结果表明, Fe-Bi2WO6@TiO2材料具有典型的包覆结构, 表现出可见光 响应并激发了氯自由基的生成. 氯自由基作为消除O3的活性物种, 驱动了一种类似“臭氧层空洞效应”的 光化学反应机制, 即表面氯化的TiO2受光激发产生氯自由基, 引发链式反应, 大幅提升了臭氧分解的性能. Fe-Bi2WO6@TiO2对O3的消除率最大为93%. 氯自由基的引入以及复合材料可见光响应的拓展, 可大幅提升光催化臭氧消除能力.

关键词: 氯自由基, 可见光响应, 光催化, 臭氧, 包覆结构

Abstract:

The concentration of ozone(O3) in our atmosphere has increased, which makes O3 a crucial pollutant in the prevention of air pollution. The photocatalytic reaction based on hydroxyl radical has low ozone elimination performance, and the modification method that only increases the production of hydroxyl radical is not suitable for ozone photocatalytic elimination. In this paper, a series of Fe-Bi2WO6@TiO2 composites were prepared by Fe doping and TiO2 supporting successively based on Bi2WO6. A series of physical properties characterization and ozone catalytic activity tests were carried out for the composites. The results show that Fe-Bi2WO6@TiO2 has a typical coating structure, exhibits visible light response, and stimulates the formation of chlorine radicals. Chlorine radicals act as active species for eliminating O3, driving a photochemical reaction mechanism similar to the "ozone hole effect", that is, the surface chlorinated TiO2 was photoexcited to produce chlorine radicals,triggering a chain reaction,and greatly improving the ozone decomposition performance. The maximum elimination rate of O3 by Fe-Bi2WO6@TiO2 is 93%. The introduction of chlorine radical and the expansion of visible light response of the composite can greatly improve the photocatalytic ozone elimination ability.

Key words: Chlorine radical, Visible light responsive, Photocatalysis, Ozone, Coating structure

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