Minh-Thuan Pham1,2,4, Hong Quang Luu2, Truc-Mai T. Nguyen2,5, Hong-Huy Tran This email address is being protected from spambots. You need JavaScript enabled to view it.2,3, Sheng-Jie You2,4, Ya-Fen Wang This email address is being protected from spambots. You need JavaScript enabled to view it.2,4

1 Department of Civil Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
2 Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
3 Université Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering, Université Grenoble Alpes), LMGP, 38000 Grenoble, France
4 Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan 32023, Taiwan
5 Center for Environmental Toxin and Emerging-Contaminant Research, Cheng Shiu University, Kaohsiung 833301, Taiwan

Received: October 12, 2021
Revised: November 13, 2021
Accepted: November 16, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.210276  

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Cite this article:

Pham, M.T., Luu, H.Q., Nguyen, T.M.T., Tran, H.H., You, S.J., Wang, Y.F. (2021). Rapid and Scalable Fabrication of TiO2@g-C3N4 Heterojunction for Highly Efficient Photocatalytic NO Removal under Visible Light. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.210276


  • The TiO2@g-C3N4 heterojunction was successfully synthesized pyrolysis method.
  • A wide range of characterizations analyzed materials’ characteristic properties.
  • The low NO2 generation and high reusability of the TiO2@g-C3N4 were determined.
  • The photocatalytic mechanism of NOx removal over TiO2@g-C3N4 was investigated.


The TiO2@g-C3N4 heterojunction composites were successfully synthesized via one-step pyrolysis using commercial TiO2 and Urea. The photocatalytic performance was investigated by measuring the degradation of nitric oxide (NO) under visible light. The light absorption and bandgap of the materials were determined by diffuse reflectance spectroscopy (DRS), which confirmed the strong photocatalytic activity of the materials under visible light. The NO photodegradation efficiency of the composite was almost 90% under visible irradiation, the generation of by-products and nitrogen dioxide (NO2) were calculated to understand the conversion pathway of the NO during the photocatalytic reaction. Furthermore, the results of recycling indicated that the TiO2@g-C3N4 composite presents excellent stability. Besides, the morphology and the chemical compositions of the materials were observed by high-resolution transmission electron microscopy (HR-TEM) images. X-ray photoelectron spectroscopy (XPS). Raman spectroscopy was used to detect the structural vibrations of the materials. Through the electron spin resonance (ESR) and trapping tests, the photocatalytic mechanism of TiO2@g-C3N4 composite has also been proposed, in which superoxide radical anions play a significant role in NO removal.

Keywords: Photocatalysis, Nitric oxide, Visible light, g-C3N4, TiO2

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