Construction of S-scheme heterojunction for enhanced photocatalytic conversation of NO over dual-defect CeO2−x/g-C3N4−x

Haonan Han, Xinglei Wang, Yongmin Qiao, Yinlong Lai, Bin Liu, Yi Zhang, Jianmin Luo, Sam Toan, Lei Wang

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31 Scopus citations

Abstract

An increasing amount of nitric oxide (NOx) is being discharged into the atmosphere due to the development of industry and combustion of fossil fuels. Photocatalysis, as a green and renewable technology, has attracted increasing attention from global researchers to address environmental pollution caused by excessive NOx in air. g-C3N4 is a metal-free organic polymer photocatalyst that has received widespread attention due to its unique physical and chemical properties. However, the photocatalytic activity of g-C3N4 under visible light irradiation is limited by high photocarrier recombination, poor conductivity, and low visible light utilization. The construction of novel S-scheme heterojunction semiconductors based on g-C3N4 is a promising strategy to enhance the photocatalytic activity. In this study, S-scheme CeO2−x/g-C3N4−x (Ce/CN) photocatalysts were synthesized by the thermal polymerization of melamine and Ce(NO3)4. The photocatalytic activity of the as-prepared photocatalysts was investigated for the removal of NO with visible-light irradiation. The photocatalytic efficiency of 4Ce/CN was about 1.7 times higher than that of g-C3N4 with a low NO2 yield. Material characterization and DFT analysis demonstrated that the enhanced photocatalytic activity was attributed to N and O dual defects, the excellent conductivity of CeO2, and the in-built field of the Ce/CN S-scheme heterojunction.

Original languageEnglish (US)
Article number167819
JournalJournal of Alloys and Compounds
Volume933
DOIs
StatePublished - Feb 5 2023

Bibliographical note

Funding Information:
This work was partially supported by the Guangdong Basic and Applied Basic Research Foundation under Grant 2021A1515010060 , 2021A1515010185 and 2019B121201004 , in part by Yili Normal University Scientific Research Project under Grant 2022YSZD007 , in part by the Guangdong Province Specialized Scientific Research Fund Projects ,and in part by the Guangdong Province University Engineering Technology Center Projects under Grant 2021GCZX011 , in part by the Guangdong Province College Innovation Team Project under Grant 2020KCXTD037 , in part by the Research and Innovation Team Cultivation Program of Yili Normal University under Grant CXZK2021005 .

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • CeO
  • G-CN
  • NO
  • S-scheme heterojunction

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