微米炭介导下4-硝基氯苯的还原-氧化耦合修复

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Abstract Acoupling remediation process mediated by micron-activated carbon (MAC) was proposed for the degradation of 4-nitrochlorobenzene (4CNB), a pollutant that is difficult to remove from soil and groundwater. The effect of MAC surface properties and temperature on the reductive degradation of 4CNB by sulfide and the mechanism of 4CNB reduction-oxidation reaction mediated by MAC were studied by batch experiments, density functional theory analysis, and electron paramagnetic resonance analysis. The results showed that MAC could change the reduction of 4CNB into a thermodynamically favorable two-electron transfer process, and reduce the effect of sulfides on persulfate oxidation through pollutant adsorption and enrichment. Then 4CNB, which was difficult to be reduced and oxidized by sulfides and persulfates alone, was effectively removed. Under MAC intensification, the reduction rate of 4CNB was 8~82 times higher than that of single sulfide as a reducing agent, and the degradation of 4CNB exceeded 99% in 4hours at above 35℃. When 4CNB was reduced to 4-Chloroaniline (CAN), it was removed by free radical oxidation and persulfate oxidation on the surface of the carbon. In this study, a new micron carbon mediated reduction-oxidation coupling route for 4CNB remediation was proposed, which provided a new insight for developing low energy consumption and low-cost remediation strategies for 4CNB-contaminated soil and groundwater by using waste heat.

Key words： 4-nitrochlorobenzene carbon material temperature coupling reaction

Received: 09 June 2022

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X53

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	Articles by authors
	WANG Di-xiang
	HUANG Ming-quan
	WU Ding-ding
	XIE Lin
	LIU Peng
	ZHU Chang-yin
	ZHOU Dong-mei

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WANG Di-xiang,HUANG Ming-quan,WU Ding-ding等. Micro carbon mediated reduction-oxidation coupling process for 4-nitrochlorobenzene remediation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 132-142.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/132

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