期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 398, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123084
关键词
Iron oxychloride; Peroxymonosulfate; Radical identification; Singlet oxygen; Disinfection by-products
资金
- National Natural Science Foundation of China [51608109]
- Natural Science Foundation of Jiangsu Province [BK20160675]
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Jiangsu Overseas Visiting Scholar Program for University Prominent Yong & Middle-aged Teachers and Presidents
Iron oxychloride (FeOCl) is utilized as a activator of peroxymonosulfate (PMS) for the degradation of paracetamol (APAP) and phenacetin (PNCT) in response to the water pollution by persistent pharmaceuticals. The degradation process was well fitted with a pseudo-first order kinetic pattern, and the excellent catalytic performance towards APAP (100 % removal) and PNCT (86.5 % removal) was obtained in the presence of 0.2 g/L FeOCl and 2.0 mM PMS at pH 7.0 in 30 min. In-situ electron spin resonance (ESR) and scavenging tests revealed the generation of a series of ROS ((OH)-O-center dot, SO4 center dot-, O-2(center dot-), O-1(2)), which was highly dependent on pH. Besides, the non radical pathways process involved O-1(2) was dominant in APAP oxidation, while both (OH)-O-center dot and O-1(2) are significant in PNCT removal. Furthermore, the formation of disinfection by-products (DBPs) during post-chlorination showed neglectable increment at neutral and alkaline condition with FeOCl/PMS pre-oxidation, and the calculated cytotoxicity would experience a continuous deterioration with pH increase. These results displayed high efficiency of FeOCl/PMS system in micropollutants degradation and a relatively comprehensive activation process of PMS, which may promote practical application in environmental remediation.
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