Photocatalytic in situ H2O2 production and activation for enhanced ciprofloxacin degradation over CeO2-Co3O4/g-C3N4: key role of CeO2

The abused ciprofloxacin antibiotics have caused significant environmental damage. Although oxidative degradation of ciprofloxacin exhibits promising efficacy, it often entails excessive energy consumption. Hence, it is necessary to explore an effective and ecologically sustainable degradation strat...

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Bibliographic Details
Published in:Rare metals 2024-06, Vol.43 (6), p.2695-2707
Main Authors: Zhu, Hong-Jie, Yang, Yi-Kai, Li, Ming-Hui, Zou, Lu-Ning, Zhao, Hai-Tao
Format: Article
Language:English
Subjects:
Antibiotics
Biomaterials
Carbon nitride
Cerium oxides
Chemistry and Materials Science
Cobalt oxides
Ecological effects
Energy
Energy consumption
Hydrogen peroxide
Hydroxyl radicals
Materials Engineering
Materials Science
Metallic Materials
Nanoscale Science and Technology
Original Article
Oxidizing agents
Photocatalysis
Photodegradation
Physical Chemistry
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Summary:The abused ciprofloxacin antibiotics have caused significant environmental damage. Although oxidative degradation of ciprofloxacin exhibits promising efficacy, it often entails excessive energy consumption. Hence, it is necessary to explore an effective and ecologically sustainable degradation strategy. Herein, we demonstrated that g-C 3 N 4 decorated with the coordinated CeO 2 and Co 3 O 4 (CeO 2 -Co 3 O 4 /CN) exhibited effective ciprofloxacin photodegradation via in situ H 2 O 2 production and activation mechanism. Results indicate that the introduced CeO 2 enhances the transference of photogenerated electrons to O 2 by adjusting the oxygen vacancy of photocatalyst, thereby increasing the generation of superoxide radicals, which in turn generate H 2 O 2 , resulting in a 22.4-fold increase in H 2 O 2 generation over g-C 3 N 4 . Moreover, the in situ H 2 O 2 generation facilitated by CeO 2 is confirmed to be essential for ciprofloxacin degradation via CeO 2 -Co 3 O 4 /CN, as it provides enough oxidant for Co 3 O 4 to activate into hydroxyl radicals for the pollutants degradation. Ultimately, CeO 2 -Co 3 O 4 /CN achieves a ciprofloxacin degradation ratio of 97.7% within 80 min. This study introduces a novel approach that combines H 2 O 2 generation and activation, offering an innovative perspective for achieving clean and efficient purification of antibiotic-contaminated water. Graphical abstract
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-023-02583-8