Efficient decolorization of azo organics by singlet oxygen from activating PMS with octahedral structured FMN-700

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

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China Environmental Science ›› 2023, Vol. 43 ›› Issue (12) : 6374-6385.

Water Pollution Control

Efficient decolorization of azo organics by singlet oxygen from activating PMS with octahedral structured FMN-700

ZHONG Qing¹, YE Xiao-zhen², ZENG Jing², CAI Lan-yan², WANG Yong-quan², HONG Jun-ming¹

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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.

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

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ZHONG Qing, YE Xiao-zhen, ZENG Jing, CAI Lan-yan, WANG Yong-quan, HONG Jun-ming. Efficient decolorization of azo organics by singlet oxygen from activating PMS with octahedral structured FMN-700[J]. China Environmental Science. 2023, 43(12): 6374-6385

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