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

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 photoca...

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Published in:Ceramics international 2022-12, Vol.48 (23), p.34533-34542
Main Authors: Van Dao, Dung, Ngoc Bich, Tran Thi, Thu Ha, Nguyen Thi, Wang, Wenmeng, Kim, Taehwan, Kim, Hooyeon, Khanh Duy, Pham Huynh, Ha, Nguyen Ngoc, Thuy Van, Do Thi, Lee, In-Hwan
Format: Article
Language:English
Subjects:
Core-shell
Hematite
Nitrogen-doped graphene
Organic pollutants
Photocatalysis
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Summary: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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2022.08.037