Alkali-assisted hydrothermal preparation of g-C3N4/rGO nanocomposites with highly enhanced photocatalytic NOx removal activity

Zhanyong Gu, Biao Zhang, Yusuke Asakura, Satoshi Tsukuda, Hideki Kato, Masato Kakihana, Shu Yin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)


Graphitic carbon nitride / reduced graphene oxide (g-C3N4/rGO) nanocomposites have become research hotspots owing to its excellent charge carrier separation efficiency and enhanced photocatalytic activity. Herein, we developed a facile alkali-assisted hydrothermal strategy to prepare g-C3N4/rGO nanocomposites. In the hydrothermal process, the NaOH not only played an important role in etching the bulk g-C3N4 into nanosheets to increase its specific surface area and active sites, but also promoted the reduction of GO to enhance the conductivity of rGO. The rGO sheets could act as an excellent electron acceptor and electronic conductive channels to improve the separation efficiency of photogenerated electron-hole pairs. The resultant g-C3N4/rGO nanocomposites exhibited 2.7 times higher photocatalytic NOx removal activity than that of bulk g-C3N4 due to the enlarged specific surface area and the enhanced separation efficiency of photogenerated carriers. Moreover, the obtained metal-free photocatalyst displayed outstanding photocatalytic performance under visible light irradiation (λ˃400 nm), compared with previously reported traditional-metal-based semiconductor photocatalysts. This work may provide new insights into preparing g-C3N4/rGO nanocomposites with enhanced photocatalytic activity.

Original languageEnglish
Article number146213
JournalApplied Surface Science
Publication statusPublished - 2020 Aug 15
Externally publishedYes


  • Alkali
  • NO
  • Photocatalysis
  • g-CN/rGO

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


Dive into the research topics of 'Alkali-assisted hydrothermal preparation of g-C3N4/rGO nanocomposites with highly enhanced photocatalytic NOx removal activity'. Together they form a unique fingerprint.

Cite this