Hematite Fe2O3@nitrogen-doped graphene core-shell photocatalyst for efficient cephalexin degradation under visible light irradiation

Dung Van Dao, Tran Thi Ngoc Bich, Nguyen Thi Thu Ha, Wenmeng Wang, Taehwan Kim, Hooyeon Kim, Pham Huynh Khanh Duy, Nguyen Ngoc Ha, Do Thi Thuy Van, In Hwan Lee

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Recently, photocatalysis has been a promising technology for removing pharmaceutical antibiotics due to low energy utilization and cost-effectiveness. In this study, hematite Fe2O3 was encapsulated with nitrogen-doped graphene to produce an active and stable Fe2O3@NGr core-shell flatform for photocatalytic degradation of cephalexin. Fe2O3@NGr under visible light irradiation delivered an impressive cephalexin degradation efficiency of 90% within 60 min, superior to free-standing Fe2O3 (40%) and NGr (15%) species, respectively. Also, it could bring a lasting catalyst for light-driven cephalexin removal. The improvements were synergistically attributed to two following effects. First, the facile generation and transfer of electron-hole pairs in the Fe2O3@NGr core-shell design were achieved under visible light. Second, the active surface of NGr shell weakly bound to the CO gas as a central intermediate species in the decomposition by-products, speeding up the cephalexin removal. Thus, these two basic factors provided mechanistic insights into the working of Fe2O3@NGr core-shell system in terms of cephalexin degradation under visible light.

Original languageEnglish
Pages (from-to)34533-34542
Number of pages10
JournalCeramics International
Issue number23
Publication statusPublished - 2022 Dec 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) ( NRF-2020R1A2B5B03001603 ), funds for Science and Technology of the University of Danang , University of Science and Education under grant number T2020-TĐ-01 , and Vietnam Ministry of Science and Technology under grant number ĐTĐL.CN-66/19 .

Publisher Copyright:
© 2022


  • Core-shell
  • Hematite
  • Nitrogen-doped graphene
  • Organic pollutants
  • Photocatalysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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