PRB活性介质球磨硫铁矿去除硝基苯

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Abstract Ball-milled pyrite (BMP) was prepared by mechanochemical method, and the reduction performance of BMP to nitrobenzene (NB) was studied by batch experiments. The sand column experiment was used to investigate the feasibility of using BMP to fill a permeable reaction barrier (PRB) to remediate nitrobenzene-contaminated groundwater. The morphology, crystal structure and elemental composition of BMP before and after reaction were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The results showed that BMP can effectively remove NB, the removal rate of NB was 98.8%. The main reduction product of NB was aniline. The pseudo-first-order kinetic model fitted the degradation process of NB well, and the degradation kinetic constant was 59.03×10^-3min^-1. No contaminants other than aniline were detected by GC-MS analysis. The results of the sand column experiment showed that BMP-PRB can continuously and efficiently remove nitrobenzene from groundwater. The groundwater composition kept stable, and the acute toxicity was significantly reduced. Characterization analysis showed that BMP has a certain adsorption capacity on NB and the reduced product. On the surface of BMP, active substances such as Fe²⁺ and S^2- with reducibility were continuously produced, which could react with the strong electron-withdrawing nitro group of NB to generate AN and Fe³⁺. The pyrite can be oxidized by Fe³⁺ to produce Fe²⁺ and promote the Fe²⁺-Fe³⁺ cycle.

Key words： nitrobenzene ball-milled pyrite acute toxicity groundwater sand column experiment

Received: 16 March 2022

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X523

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	Articles by authors
	LIAO Ya-ping
	ZHANG Shan-shan
	WU Chao
	YUAN Qian
	WANG Ming-xin

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LIAO Ya-ping,ZHANG Shan-shan,WU Chao等. Removal of nitrobenzene by ball-milled pyrite as permeable reactive barrier active medium[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(10): 4639-4649.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I10/4639

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