Fe(VI)@PMS双氧化体系降解废水中的尼泊金甲酯

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Abstract Ferrate-activated peroxymonosulfate (Fe(VI)@PMS system) was used to degrade methylparaben (MeP) in wastewater. The degradation performance of MeP with different Fe(VI) dosage, PMS concentration, initial pH value, reaction temperature, initial MeP concentration and coexisting ions was investigated. Based on the Box-Behnken experimental design, a multifactorial experiment was conducted to fit the relationship between the degradation rate of MeP and Fe(VI) dosage, PMS concentration and initial pH to optimize the reaction conditions. The results showed that the MeP degradation rate was 99.03% under the conditions of Fe(VI) dosage of 0.92g/L, PMS concentration of 1.08mmol/L, initial pH of 6.83, and temperature of 25°C, which was similar to the model prediction of the maximum degradation rate of 99.17% for MeP, indicating that the response surface model has a better simulation and prediction ability. Cl^-, NO₃^-, HCO₃^- and SO₄^2- had no significant effect on the degradation of MeP. The free radical identification experiments proved that the degradation of MeP was accomplished by a combination of free radicals (·OH and SO₄^-·) and non-radical (¹O₂) oxidation, with ¹O₂ playing a major role. Liquid chromatography-mass spectrometry (LC-MS) analysis showed that the main pathways of MeP degradation included hydroxylation and decarboxylation reactions. ECOSAR toxicity analysis showed that the toxicity of MeP could be significantly reduced into non-toxic and harmless in Fe(VI)@PMS system.

Key words： ferrate peroxymonosulfate double oxidation system methylparaben response surface analysis degradation mechanism

Received: 02 May 2024

PACS:

X703.5

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	Articles by authors
	ZHAO Wen-bo
	SU Bing-qin
	ZHANG Xia-ling
	SONG Xin-tong
	LIN Jia-wei
	WEI Yue-xing

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ZHAO Wen-bo,SU Bing-qin,ZHANG Xia-ling等. Fe(VI)@PMS double oxidation system for degradation of methylparaben from wastewater[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(12): 6921-6934.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I12/6921

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