八面体FMN-700活化过硫酸盐产生<sup>1</sup>O<sub>2</sub>降解偶氮有机物

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Abstract A catalytic material containing iron and manganese nitride (FMN-700) was prepared by high-temperature calcination using nitrogen-doped Prussian blue analogue (PBA) as a precursor for the rapid degradation of azo organic compounds by activated peroxymonosulfate (PMS). The catalysts were characterized by scanning electron microscopy (SEM), X-ray powder diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR), which demonstrated that FMN-700 has a layered stacked ortho-octahedral structure and contains Fe-Mn-nitride. The effects of catalyst dosage, PMS concentration and initial pH on the catalytic degradation of azo organics were investigated. The results showed that 99.5% decolorization of RBK5 at 10mg/L could be achieved within 60min at an initial pH of 7, a catalyst dosing of 0.2g/L and a PMS concentration of 2mmol/L. The quenching experiments and Electron Paramagnetic Resonance (EPR) indicated that ¹O₂ was the main active substance in the degradation system. X-ray photoelectron spectroscopy (XPS) showed that the Fe(III)/Fe(II) and Mn(III)/Mn(II) ratios increased and the pyridine N content decreased before and after the reaction. This process can induce the production of ¹O₂. The significant increase of fluorescence intensity of 3D-EEM spectrum showed that the azo bond with fluorescence quenching effect was broken during the degradation process and azo organic compounds were successfully decolorized and degraded.

Key words： iron/manganese nitride peroxymonosulfate (PMS) singlet oxygen(¹O₂) heterogeneous catalysis

Received: 26 April 2023

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X703.1

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	ZHONG Qing
	YE Xiao-zhen
	ZENG Jing
	CAI Lan-yan
	WANG Yong-quan
	HONG Jun-ming

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ZHONG Qing,YE Xiao-zhen,ZENG Jing等. Efficient decolorization of azo organics by singlet oxygen from activating PMS with octahedral structured FMN-700[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(12): 6374-6385.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I12/6374

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