FeCu@NBC双金属复合体系对全氟辛酸的降解机制研究

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Abstract The nitrogen-doped biochar-supported Fe and Cu bimetallic composite (FeCu@NBC) was synthesized by a one-step pyrolysis, and its catalytic degradation efficiency and influencing factors on PFOA were investigated. Then, the degradation mechanisms and potential pathways of PFOA were analyzed by free radical detection and quenching experiments, as well as the time-of-flight mass spectrometry (TOF-MS) and density functional theory (DFT) calculation. The results show that Fe and Cu on the surface of FeCu@NBC mainly existed in the form of zero-valent single element, which could achieve a favorable removal performance of PFOA under a neutral condition. As its dosage was 1g/L and the initial PFOA concentration was 100mg/L, the removal efficiency of PFOA reached 92.1% within 6h of reaction, which was significantly higher than that of Fe@NBC (28.5%) and Cu@NBC (66.8%), indicating that the synergistic effect of Fe⁰ and Cu⁰ can enhance PFOA decomposition. The free radical quenching experiments and ESR measurements suggest that the free electron (e^-) was the main factor affecting the decomposition of PFOA. Furthermore, the results of TOF-MS and DFT calculation show that the potential degradation pathway of PFOA followed firstly decarboxylation to generate unstable C₇F₁₅·, then hydrolysis to gradually generate short-chain perfluoroalkyl carboxylic acid, and finally achieved the effective decomposition of PFOA.

Key words： perfluorooctanoic acid FeCu@NBC density functional theory degradation mechanism

Received: 27 October 2022

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X703.1

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	Articles by authors
	KONG Yi-fan
	TANG Zheng
	CHEN Xiao-qian
	LIU Min
	SHEN Lu
	QIN Yan
	GAO Pin

Cite this article:

KONG Yi-fan,TANG Zheng,CHEN Xiao-qian等. Degradation mechanisms of perfluorooctanoic acid by FeCu@NBC bimetallic composite system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2497-2507.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2497

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