钢渣强化铁氮多孔碳活化过硫酸盐降解四环素

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Abstract A new magnetic iron-nitrogen porous carbon with steel slag composite (PC-_Fe,N/SS) was obtained by combining iron-nitrogen porous carbon (PC-_Fe,N) made from wood chips with steel slag (SS) by a mechanical ball milling method to degrade tetracycline (TC) with its activated peroxymonosulfate (PMS). The results showed that the TC degradation rate of PC-_Fe,N/SS/PMS system was 87.50% at initial TC concentration of 20mg/L, PMS and catalyst dosage of 0.50g/L, and pH value of 7.0 within 30min. This was mainly because the surface pore structure and internal electronic structure of porous carbon were improved by KHCO₃ and N doping, which provided more reaction sites for PMS; the functional advantages of PC-_Fe,N and SS were synergized by the ball milling method, while the agglomeration of Fe nanoparticles on the surface of the material were reduced, which promoted the activation of PMS and the degradation of TC. The VSM and XPS characterization results showed that the saturation magnetization intensity of the material was 28.93emu/g, which was favorable for the separation and recovery; Fe⁰ and Fe²⁺ played an important role in the degradation of TC. The results of radical quenching experiments and electron paramagnetic resonance (EPR) tests revealed that the main active species in the degradation of TC by the PC-_Fe,N/SS/PMS system was the sulfate radical (SO₄^•-).

Key words： porous carbon iron-nitrogen co-doping mechanical ball milling method tetracycline catalytic degradation peroxymonosulfate

Received: 16 November 2022

PACS:

X703.5

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	Articles by authors
	CHEN Ai-xia
	LEI Chan-juan
	TIAN Zheng
	WEI Xiao
	WANG Ning
	YANG Xu-lin

Cite this article:

CHEN Ai-xia,LEI Chan-juan,TIAN Zheng等. Steel slag enhanced iron-nitrogen porous carbon activated peroxymonosulfate to degrade tetracycline[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2853-2863.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2853

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