非自由基主导的FeMn纳米颗粒活化过一硫酸盐降解有机污染物

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Abstract Mesoporous FeMn nanoparticles (FMNPs) with high catalytic activity and stability were successfully synthesized by a two-step hydrothermal-calcination method. The physicochemical properties, morphology, and structure of FMNPs were analyzed by scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), Specific surface and pore size analyzer (BET), Fourier transform infrared spectroscopy (FTIR), and X-ray powder diffractometry (XRD). The synthesized catalysts, featuring abundant mesopores and a large specific surface area, significantly enhanced the catalytic degradation of organic pollutants. To assess the reusability, stability, and adaptability of the catalysts, degradation experiments were conducted with reactive black 5 (RBK5) under various conditions. The optimal parameters were established at a pH of 7, a persulfate (PMS) concentration of 2mmol/L, and a catalyst dosage of 0.2g/L, achieving a 96.74% removal of 10mg/L RBK5 within 60 minutes. The catalytic mechanism was investigated through Electron Paramagnetic Resonance (EPR), quenching experiments, and Chronocurrent (i-t) tests, confirming that the non-radical pathway (¹O₂ and mediated electron transfer) played a dominant role in the degradation process. X-ray photoelectron spectroscopy (XPS) analysis revealed that the synergistic effect between Fe and Mn promoted the redox cycle of Fe³⁺/Fe²⁺ and Mn²⁺/Mn³⁺, accelerating the electron transfer to PMS and thereby boosting the activation efficiency of PMS.

Key words： bimetallic catalyst peroxymonosulfate(PMS) non-radical pathway efficient degradation

Received: 12 December 2023

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X703

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	LIN Shuang-jie
	WANG Yong-quan
	ZENG Jing
	CAI Lan-yan
	HONG Jun-ming

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LIN Shuang-jie,WANG Yong-quan,ZENG Jing等. Nonradical-dominated peroxymonosulfate activation by FeMn nanoparticles for the degradation of organic pollutants[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(7): 3729-3740.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I7/3729

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