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The widespread nitrogen oxides (NOx, mainly in NO) in the atmosphere have threatened human health and ecological environment. The dilute NO (ppb) is difficult to efficiently remove via the traditional process due to its characteristics of low concentration, wide range, large total amount, etc. Photocatalysis can utilize solar energy to purify NO pollutants under mild conditions, but its application is limited due to the low selectivity of nitrate and poor activity of NO removal. The underlying reason is that the interface mechanism of NO oxidation is not clearly understood, which leads to the inability to accurately regulate the NO oxidation process. Herein, the recent advances in the photocatalytic oxidation of NO are summarized. Firstly, the common strategies to effectively regulate carrier dynamics such as morphology control, facet engineering, defect engineering, plasma coupling, heterojunction and single-atom catalysts are discussed. Secondly, the progress of enhancing the adsorption and activation of reactants such as NO and O2 during NO oxidation is described in detail, and the corresponding NO oxidation mechanisms are enumerated. Finally, the challenges and prospects of photocatalytic NO oxidation are presented in term of nanotechnology for air pollution control. This review can shed light on the interface mechanism of NO oxidation and provide illuminating information on designing novel catalysts for efficient NOx control.

Publication history
Copyright
Acknowledgements

Publication history

Received: 10 June 2023
Revised: 12 July 2023
Accepted: 16 July 2023
Published: 11 September 2023
Issue date: February 2024

Copyright

© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22022608, 21876113, 22176127, 21261140333, 22106105 and 62071300), the Shanghai Engineering Research Center of Green Energy Chemical Engineering (No. 18DZ2254200), “111” Innovation and Talent Recruitment Base on Photochemical and Energy Materials (No. D18020), Shanghai Government (Nos. 22010503400, 18SG41 and YDZX20213100003002), Shanghai Scientific and Technological Innovation Project (No. 21DZ1206300) and Shanghai Sailing Program (No. 22YF1430400).

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