Ti/PbO<sub>2</sub>电化学法降解废水中三种氟喹诺酮类抗生素

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Abstract

Ti/PbO₂ electrochemical oxidation mechanisms of three typical fluoroquinolone antibiotics (FQNs) in wastewater were studied. The effects of pH, electrolyte and electrolysis time were optimized, and the removal efficiency, degradation kinetics and products of norfloxacin (NOR), Pefloxacin Mesylate (PEF), and ciprofloxacin (CIP) were explored. The results revealed that, after 240minutes, Ti/PbO₂ electrodes could remove more than 97% of FQNs under the given conditions (initial pH 7.8~8.0, [Na₂SO₄]0: 0.04mol/ L). Moreover, the degradation rates were well fit with the first-order kinetic equation. The decrease percentages of UVA₂₅₄ value were larger than 67%. A significant decrease in SUVA values and aromaticity after degradation was also observed. HPLC-MS/MS was used to confirm the degradation intermediates and three possible degradation mechanisms were proposed based on the oxidation products. The intermediates were mainly produced by defluorination,piperazine ring transformation, and quinoline ring transformation.Furthermore, the electrolytic products had a tendency to increase at first and then decrease over time. Some inorganic products, such as F^-, NH₄⁺, and NO₃^- were founded in the wastewater after treatment. Our results indicated that the Ti/PbO₂ electrodes was effective and proved to be a promising method for the pretreatment of fluoroquinolone antibiotics in wastewater.

Key words： Ti/PbO₂ anode fluoroquinolone wastewater degradation intermediates

Received: 15 November 2019

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X703

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	Articles by authors
	GAO Jin-long
	CHEN Yi-fan
	LI Ji-wei
	WANG Jun
	YU Ya-lin
	PANG Tian-tian
	QI Yu-ting
	LIAO Qian-jia-hua

Cite this article:

GAO Jin-long,CHEN Yi-fan,LI Ji-wei等. Degradation of three fluoroquinolones antibiotics in wastewater by Ti/PbO₂ electrochemical method[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(6): 2454-2463.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I6/2454

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