生物成因次生铁矿物催化类芬顿反应降解氟苯尼考

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Abstract Using florfenicol (FFC) as the target pollutant, schwertmannite and jarosite as catalysts synthesized by the mediation of A. ferrooxidans to investigate their effectiveness in catalyzing Fenton-like reactions for FFC degradation. Initially, the two minerals were characterized using SEM, XRD, FTIR and BET analysis. Subsequently, the impact of four key variables—mineral dosage, H₂O₂ concentration, pH, and temperature—on FFC degradation was studied. Finally, the degradation mechanism of FFC and the reusability of the minerals were analyzed. The results indicated that the biosynthesized schwertmannite and jarosite were pure minerals, with average particle diameters of approximately 2.5μm and 5.0μm and jarosite exhibiting more noticeable aggregation. The specific surface areas of schwertmannite and jarosite were 116.67m²/g and 87.52m²/g, respectively, with total pore volumes of 0.098cm³/g and 0.065cm³/g and average pore diameters of 2.986nm and 2.867nm. Increasing the mineral dosage enhanced the degradation efficiency of FFC by both minerals. The degradation efficiency of FFC initially increased and then decreased with an increase in the H₂O₂ concentration. Under acidic conditions, both minerals exhibited better degradation effects. The degradation rate increased with rising temperature. Under the combined experimental conditions of a mineral dosage of 10g/L, an H₂O₂ concentration of 200mg/L, an pH of 3.00, and a temperature of 36℃, combined with Liquid Chromatography-Mass Spectrometry (LC-MS) test results, the degradation mechanism of FFC by the two minerals was inferred as follows: The minerals adsorbed H₂O₂ onto their surfaces, catalyzing its decomposition to produce hydroxyl radicals (·OH), which oxidized FFC into intermediate products, ultimately leading to inorganic substances. A total of six intermediate products were detected during the Fenton-like reaction, including small organic molecules such as alcohols, aldehydes, or carboxylic acids containing benzene rings, amide groups, or amine groups, as well as methyl phenyl sulfone. After 10cycles of reuse, the crystal structure and functional groups of the two minerals remained unchanged, demonstrating good stability.

Key words： florfenicol catalyst schwertmannite jarosite Fenton-like

Received: 27 August 2024

PACS:

X703

Corresponding Authors: 申祖武,教授,1632793705@qq.com E-mail: 1632793705@qq.com

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	SONG Yong-wei
	DENG Ru-yue
	QIN Qi-lu
	GUO Ze-hao
	LUO Hao-wei
	YANG Jun
	SHEN Zu-wu

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SONG Yong-wei,DENG Ru-yue,QIN Qi-lu等. Degradation of flufenicol by Fenton-like reaction catalyzed by biosynthetic secondary iron minerals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1321-1332.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1321

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