Micro carbon mediated reduction-oxidation coupling process for 4-nitrochlorobenzene remediation
WANG Di-xiang1,2, HUANG Ming-quan1, WU Ding-ding1, XIE Lin2, LIU Peng2, ZHU Chang-yin1, ZHOU Dong-mei1
1. State Key Laboratory of Pollution Control & Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China; 2. Beijing Construction Engineering Group Environmental Remediation Co. Ltd., Beijing 100015, China
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.
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