How does pH influence ferrate(VI) oxidation of fluoroquinolone antibiotics?

被引：0
|
作者：
Wang, Dingxiang [1 ]
Zeng, Zhen [2 ]
Zhang, Honglong [1 ]
Zhang, Jing [1 ]
Bai, Ruopeng [2 ]
机构：
[1] College of Environment and Ecology, Chongqing University, Chongqing,400045, China
[2] School of Chemistry and Chemical Engineering, Chongqing University, Chongqing,401331, China
来源：
Chemical Engineering Journal | 2022年 / 431卷
基金：
中国国家自然科学基金;
关键词：
Alkalinity - Antibiotics - Iron compounds - Rate constants;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This study investigated the impact of pH on the efficiency of ferrate (Fe(VI), K2FeO4) toward fluoroquinolone antibiotics, built kinetic models of Fe(VI) oxidation, and elucidated the involved active species during Fe(VI) oxidation at acidic and alkaline conditions. It was found that the second-order reaction rate constants (kapp, M−1 s−1) of Fe(VI) with three fluoroquinolone antibiotics (i.e., enroxacin, ofloxacin, and norfloxacin) were strongly dependent on pH, and kapp reached its maximum at pH about 6.5. The reactions between HFeO4-/H2FeO4 and neutral/protonated fluoroquinolone antibiotics (X and XH+) were the major ones. Moreover, the reactive species were identified as high-valent iron species, i.e., Fe(VI), Fe(V), and Fe(IV), in alkaline solution, while hydroxyl radicals was generated through Fenton or Fenton-like processes at acidic condition with limited contribution. © 2021 Elsevier B.V.
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