纳米立方体PBA-Fe<sub>1</sub>Mn<sub>2</sub>活化过一硫酸盐降解偶氮有机物

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Abstract The nano-scale Fe-Mn bimetallic catalyst of Prussian blue analogue PBA-Fe₁Mn₂, was prepared by a two-step oil bath-hydrothermal method. The large contactable area and many active sites of the nanoscale catalyst was utilized to activate peroxymonosulfate (PMS) for reactive black 5 (RBK5) degradation. Serious catalyst were characterized by X-ray powder diffractometry (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR), indicating that the synthesized catalyst PBA-Fe₁Mn₂ had structure of Prussian blue cubes. The synergistic effect of FeMn bimetal with the active site on the cubic structure effectively enhanced the degradation efficiency of RBK5. Under the optimal conditions of initial pH=7, catalyst dosage of 0.2g/L and PMS concentration of 2mmol/L, the decolorization efficiency of 10mg/L RBK5 could reach 100% within 60min. The free radical quenching experiments and EPR showed that HO• and SO₄^-• in this system were involved in the degradation of RBK5 and the hydroxyl radicals on the catalyst surface were the main acting groups. XPS reflected the changes of FeMn valence states, proved the synergistic interaction between bimetals, and identified the promotion of activity via FeMn valence cyclizing process. Finally, the degradation mechanism was analyzed according to XPS and 3D-EEM, which indicated that RBK5 was degraded in the system.

Key words： reactive black 5 (RBK5) FeMn bimetal nano-scale catalyst peroxymonosulfate (PMS) decolorization and degradation

Received: 16 November 2022

PACS:

X703.5

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	Articles by authors
	ZHANG Ting
	ZENG Jing
	YE Xiao-zhen
	LAN Yan-yan
	WANG Yong-quan
	HONG Jun-ming

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ZHANG Ting,ZENG Jing,YE Xiao-zhen等. Nanoscale PBA-Fe₁Mn₂ activated peroxymonosulfate for degradation of Azo organic[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3533-3544.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3533

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