文献类型：期刊文献

英文题名：Efficient moxifloxacin degradation by CoFe2O4 magnetic nanoparticles activated peroxymonosulfate: Kinetics, pathways and mechanisms

作者：Liu, Lili[1];Mi, Haosheng[1];Zhang, Meng[1,2];Sun, Feifei[1];Zhan, Rui[1];Zhao, Hanbin[1];He, Siqi[1];Zhou, Lei[1,2]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2021

卷号：407

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20204309386446);WOS:【SCI-EXPANDED(收录号:WOS:000607603600001)】；

基金：This work was sponsored by National Key Research and Development Program of China (2018YFC1901000), Major Science and Technology Program for Water Pollution Control and Treatment of China (2017ZX07202006) and National Natural Science Foundation of China (41907110, 41771513).

语种：英文

外文关键词：Peroxymonosulfate; Moxifloxacin; CoFe2O4; Sulfate radicals; Degradation pathway

摘要：CoFe2O4 magnetic nanoparticles (CoFe2O4 MNPs) were used as heterogeneous catalysts to activate peroxymonosulfate (PMS) for moxifloxacin (MOX) removal in this study. The impacts of initial pH, PMS, catalyst dosage, coexisting ions, and natural organic matter (NOM) were investigated, and the possible degradation pathways of MOX were proposed. The results indicated that efficient degradation of MOX (99.8%) could be achieved in the CoFe2O4/PMS system with the optimum reaction condition (initial pH = 9, CoFe2O4 dosage = 100 mg/L, PMS dosage = 0.25 mM, reaction time = 30 min, and MOX concentration = 5 mg/L). The rule of MOX degradation followed the pseudo-first order kinetic reaction equation (k(ohs), = 0.194 min(-1)). According to the results of radical scavenging experiments, the contribution of HO center dot on MOX removal was negligible, and SO4 center dot- played a dominant role in MOX degradation. Five probable MOX degradation pathways were proposed based on the identified fifteen degradation intermediates, including defluorination, decarboxylation, decyclopropyl reaction, transformation of quinolone moieties, oxidation, and cleavage of nitrogen-containing heterocycle. The existence of 5 mM Cl-, HCO3-, and HA posed stronger negative effects on MOX removal. However, the MOX removal efficiency increased with H2PO4 concentration in the first 15 min. The removal efficiency of MOX decreased significantly in the CoFe2O4/PMS system when the catalyst was reused five times. These research conclusions could provide useful information for the practical application of CoFe2O4 /PMS system in wastewater treatment of antibiotics.