Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 23, Pages 34533-34542Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.08.037
Keywords
Organic pollutants; Photocatalysis; Hematite; Nitrogen-doped graphene; Core-shell
Categories
Funding
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [DTDL.CN-66/19]
- funds for Science and Technology of the University of Danang, University of Science and Education
- Vietnam Ministry of Science and Technology
- [NRF-2020R1A2B5B03001603]
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Photocatalysis is a promising technology for removing pharmaceutical antibiotics. This study developed an active and stable Fe2O3@NGr core-shell platform for efficient degradation of cephalexin. The improved performance was attributed to the facile generation and transfer of electron-hole pairs and the active surface of the NGr shell that accelerated cephalexin removal.
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.
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