Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (10): 1695-1703.DOI: 10.1016/S1872-2067(18)63097-9

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Generation and transformation of ROS on g-C3N4 for efficient photocatalytic NO removal: A combined in situ DRIFTS and DFT investigation

Jieyuan Lia, Ping Yanb, Kanglu Lia, Wanglai Cenb, Xiaowei Yud, Shandong Yuanb, Yinghao Chua, Zhengming Wangc   

  1. a College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China;
    b Institute of New Energy and Low Carbon Technology, Sichuan University, Chengdu 610065, Sichuan, China;
    c Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan;
    d South China Institute of Environmental Sciences, the Ministry of Environmental Protection of PRC, Guangzhou 510655, Guangdong, China
  • Received:2018-04-21 Revised:2018-05-07 Online:2018-10-18 Published:2018-08-03
  • Contact: 10.1016/S1872-2067(18)63097-9
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51508356), Science and Technology Support Program of Sichuan Province (2014GZ0213,2016GZ0045), and Youth Project in Science and Technology Innovation Program of Sichuan Province (17-YCG053).

Abstract:

Understanding the performance of reactive oxygen species (ROS) in photocatalysis is pivotal for advancing their application in environmental remediation. However, techniques for investigating the generation and transformation mechanism of ROS have been largely overlooked. In this study, considering g-C3N4 to be a model photocatalyst, we have focused on the ROS generation and transformation for efficient photocatalytic NO removal. It was found that the key to improving the photocatalysis performance was to enhance the ROS transformation from ·O2- to ·OH, elevating the production of ·OH. The ROS directly participate in the photocatalytic NO removal and tailor the rate-determining step, which is required to overcome the high activation energy of the intermediate conversion. Using a closely combined experimental and theoretical method, this work provides a new protocol to investigate the ROS behavior on g-C3N4 for effective NO removal and clarifies the reaction mechanism at the atomic level, which enriches the understanding of ROS in photocatalytic environmental remediation.

Key words: Photocatalysis, Reactive oxygen species, g-C3N4, NO removal, Reaction mechanism