低频超声辅助电催化降解水中抗菌药氟康唑

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Abstract Low-frequency ultrasound (20kHz, 78W) assisted electrochemical oxidation (Ti/SnO₂-Sb/La-PbO₂ as the anode) was used to eliminate aqueous fluconazole, and the degradation mechanism was further investigated. Fluconazole cannot be directly degraded by low-frequency ultrasound. The acceleration electrochemical degradation of fluconazole might be ascribed to the increased ·OH electrochemical production (81.95 times) under low-frequency ultrasound. Moreover, the mass transfer rate and the electron transfer ability at the electrode interface were also enhanced, which were conducive to the electrochemical degradation of fluconazole. The reaction rate constants of fluconazole degradation increased by 42.68% when the ultrasound power increased from 26W to 130W, and increased by 24.00 times when the current density increased from 2mA/cm² to 20mA/cm². The main degradation mechanism of fluconazole was the indirect oxidation of ·OH (relative contribution of 82.45%~85.71%). Fluconazole was degraded by defluorination, bond cleavage, cyclization and oxidation, followed by the formation of formic acid, oxalic acid, NO₃^- and F^-.

Key words： electrocatalytic oxidation fluconazole low-frequency ultrasound kinetics degradation mechanism

Received: 21 September 2022

PACS:

X703.5

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	LIU Zhun
	MENG Xin-xin
	QIAN Xu-bin
	TANG Shao-yu
	FANG Cheng
	XU Lei
	NIU Jun-feng

Cite this article:

LIU Zhun,MENG Xin-xin,QIAN Xu-bin等. Low-frequency ultrasound assisted electrocatalytic degradation of antimicrobial fluconazole in water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1590-1600.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1590

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