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. 21, 210276. https://doi.org/10.4209/aaqr.210276


HIGHLIGHTS

  • 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.
 

ABSTRACT


TiO2@g-C3N4 heterojunction composites were successfully synthesized via one-step pyrolysis using commercial TiO2 and urea. The photocatalytic performance of a composite was investigated by measuring the degradation of nitric oxide (NO) under visible light. The light absorption and bandgap of the selected materials were determined using 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) was calculated to determine the conversion pathway of NO during the photocatalytic reaction. Furthermore, the results for recycling indicated that the TiO2@g-C3N4 composite exhibited excellent stability. Also, the morphology and the chemical compositions of the materials were observed using high-resolution transmission electron microscopy (HR-TEM) images and X-ray photoelectron spectroscopy (XPS). Raman spectroscopy was used to detect the structural vibrations in the materials. Through electron spin resonance (ESR) and trapping tests, the photocatalytic mechanism of the TiO2@g-C3N4 composite was also elucidated, in which superoxide radical anions were found to play a significant role in NO removal.


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




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