Insights into the mechanism of enhanced peroxymonosulfate degraded tetracycline using metal organic framework derived carbonyl modified carbon-coated Fe 0

• Published in: Journal of hazardous materials 2022-02, Vol.424 (Pt D), p.127640
• Main Authors: Yang, Yiqiong, Ji, Wenqing, Li, Xingyu, Lin, Huidong, Chen, Hongjia, Bi, Fukun, Zheng, Zenghui, Xu, Jingcheng, Zhang, Xiaodong
• Format: Article
• Language: English
• Subjects: Anti-Bacterial Agents; Carbon; Metal-Organic Frameworks; Peroxides; Tetracycline
• ISSN: 1873-3336
• DOI: 10.1016/j.jhazmat.2021.127640

Tetracycline (TC) is a commonly used antibiotic that has gained wide spread notoriety owing to its high environmental risks. In this study, rich carbonyl-modified carbon-coated Fe was obtained by pyrolysis of MIL-100(Fe) in an Ar atmosphere, and used to activate peroxymonosulfate (PMS) for the degradation of tetracycline in water. The roles of Fe , carbon and surface carbonyl on PMS activation were investigated. Fe continuously activated PMS, acted as a sustained-release source of Fe , and could effectively activate PMS to produce SO , O and •OH. Carbon was found to do responsible for electron transportation during the activation of PMS and slow down the oxidation of Fe . The carbonyl group on the carbon surface layer was the active site of O , which explains the enhanced performance for TC degradation. When Ca = 0.1 g/L and C = 0.4 mM, TC degradation rate reached 96%, which was attributed to the synergistic effect of radicals (i.e., SO , O , •OH) and non-radical (i.e., O ). Finally, the degradation pathway was proposed by combining density functional theory (DFT) calculations with liquid chromatography-mass spectrometry (LC-MS), toxicities of the intermediate products were also evaluated. All results show that carbonyl-modified carbon-coated Fe possesses promising capacity for the removal of antibiotics from water.