Mn-Co/(sic)-Al2O3 coupled with peroxymonosulfate as efficient catalytic system for degradation of norfloxacin

文献类型： 外文期刊

第一作者： Li, Ying

作者： Li, Ying;Wang, Zhan;Zou, Hongtao;Li, Ying;Zou, Ziyu;Yu, Pingzhong;Zhao, Ercheng;Wu, Junxue;Li, Ying;Wang, Zhan;Li, Ying;Wang, Zhan;Zou, Hongtao

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关键词： Norfloxacin; Peroxymonosulfate; Mn-Co/(sic)-Al2O3; Degradation mechanisms

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.136； 五年影响因子：8.258 ）

ISSN： 1383-5866

年卷期： 2022 年 302 卷

页码：

收录情况： SCI

摘要： As one of the most widely used antibiotics, fluoroquinolones (FQs) are frequently detected in water resources, posing a severe threat to human health and ecological environment. In the present study, Mn-Co/(sic)-Al2O3 material was synthesized as a highly effective activator for peroxymonosulfate (PMS) to degrade the typical FQs norfloxacin (NOR). The degradation efficiency of NOR was up to 90.7 % within 60 min using 2.0 mM PMS and 0.10 g/L Mn-Co/(sic)-Al2O3 at pH 6.6 and 25 degrees C. The NOR degradation obeyed pseudo-first-order reaction kinetics. High PMS concentration and temperature could enhance the NOR degradation. The presence of Cl- and humic acid could reduce the NOR degradation, whereas the NOR transformation was promoted with the addition of HCO3-. The degradation efficiencies (82.0-88.7 %) of other three FQs (ciprofloxacin, ofloxacin and enrofloxacin) showed the Mn-Co/(sic)-Al2O3 activated PMS process could be applied to remove the FQs. The degradation efficiencies of NOR (79.0-90.7 %) and the total organic carbon (TOC) removal rates (71.9-86.6 %) in the five continuous applications of Mn-Co/(sic)-Al2O3 indicated that Mn-Co/(sic)-Al2O3 has stable applicability in the PMS-based system. Radical scavenger experiments demonstrated that reactive species SO4 center dot-, (OH)-O-center dot and O-1(2) were involved in the degradation process of NOR. The possible degradation pathways of NOR were speculated based on eleven identified products. Overall, the Mn-Co/(sic)-Al2O3 activated PMS process is an efficient method for rapid remediation of the FQs contaminated water.

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