FeCo2O4@CNT/PVDF catalytic spheres as peroxymonosulfate activator for levofloxacin decontamination: Catalytic mechanism, ecotoxicity evolution and degradation pathways

Cao, Dongran; Li, Yunhe; Xia, Qi; Man, Zhihao; Wang, Ce; Hou, Yilong; Shang, Jiangwei; Cheng, Xiuwen

doi:10.1016/j.cej.2024.148628

Cited by 5 publications

(2 citation statements)

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“…With NO 3 − and HCO 3 − , the removal efficiency of PCP dropped by 28.8 and 40.7%, respectively. This reduction is attributed to NO 3 − and HCO 3 − reacting with • OH to form radicals (NO 3 • and CO 3 •− ) with lower oxidation potentials, , diminishing the system’s reactivity and hindering PCP degradation. Notably, HCO 3 − shows a more pronounced inhibitory effect than NO 3 − .…”

Section: Resultsmentioning

confidence: 99%

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Contact-Electro-Catalysis for the Degradation of Pentachlorophenol Using Inert Fluorinated Ethylene Propylene Powders

Li,

Lai,

Lin

et al. 2024

ACS EST Eng.

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Chlorophenols (CPs) pose significant risks to human health due to their toxicity and carcinogenic properties. The direct oxidative breakdown of CPs can produce even more harmful byproducts, resulting in secondary pollution. There is a pressing need for a technology capable of both reducing and oxidizing CPs for their removal. For this research, we utilized commercially accessible organic polymer fluorinated ethylene propylene (FEP) as a catalyst, activated through ultrasound to kickstart a contact-electro-catalysis process to degrade pentachlorophenol (PCP). A proposed mechanism is presented for the reduction and oxidative breakdown of PCP relying on contact electrification-induced electron transfer that creates reactive species. Experimental findings demonstrate that PCP can be completely degraded with only 1.0 mg of FEP. Experiments on identifying and quenching reactive oxygen species indicate that • O 2 − ,• OH, and 1 O 2 play a role in the degradation process. The degradation of PCP involves four pathways: direct dechlorination, hydroxylation dechlorination, oxidation, and polymerization. Toxicity assessment reveals that the dechlorination process notably decreases the toxicity of intermediates. Furthermore, characterization and cycling experiments demonstrate the outstanding stability and recyclability of FEP, making it suitable for real environmental water applications. Ultrasound-driven contact-electro-catalysis system offers a straightforward, economical, and eco-friendly approach to degrade PCP. It offers valuable insights for potentially treating stubborn CPs effectively.

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Section: Resultsmentioning

confidence: 99%

“…•− ) with lower oxidation potentials, 43,44 diminishing the system's reactivity and hindering PCP degradation. Notably, HCO 3 − shows a more pronounced inhibitory effect than NO 3 − .…”

Section: ■ Materials and Methodsmentioning

confidence: 99%