MnFe<sub>2</sub>O<sub>4</sub>活化过一硫酸盐降解废水中LAS

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Abstract The Fe-Mn bimetallic composite catalyst MnFe₂O₄ was prepared by co-precipitation method, applied to active peroxymonosulfate (PMS) to generate strong oxidizing sulfate radicals (SO₄⁻·) for oxidative degradation of anionic surfactants (LAS) in water. The catalysts were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM). It was indicated that the catalyst with MnFe₂O₄ spinel structure was successfully synthesized. Effects of various factors such as catalyst dosage, PMS dosage and initial pH on the degradation efficiency and reaction kinetics of LAS were investigated. The experimental results showed that the MnFe₂O₄ activates PMS to degrade LAS in accordance with quasi-first-order kinetics (R²>0.9). The LAS degradation efficiency can reached 94.1% within 60 min when the initial concentration of LAS was 80mg/L, the catalyst dosage was 2.0g/L, the concentration of PMS was 2.5mmol/L, and the initial pH was 7.0. The degradation rate constant reached 0.192min^-1. The active species that plays a major role in oxidative degradation in MnFe₂O₄/PMS system was identified as SO₄⁻· by radical quenching experiment. By the X-ray photoelectron spectroscopy (XPS) analysis of the catalyst before and after the reaction, the synergistic effect between Fe and Mn was confirmed which in order to improve the activation efficiency of PMS by MnFe₂O₄.

Key words： MnFe₂O₄ PMS LAS sulfate radical

Received: 22 January 2019

PACS:

X703.5

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	Articles by authors
	SHE Yue-cheng
	DONG Zheng-yu
	WU Li-ying
	WANG Ji
	ZHANG Qian
	HONG Jun-ming

Cite this article:

SHE Yue-cheng,DONG Zheng-yu,WU Li-ying等. Degradation of LAS in wastewater by peroxymonosulfate activated by MnFe₂O₄[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3323-3331.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3323

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