硫化纳米铁反应带修复硝基苯污染地下水

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Abstract

Sulfidated-nanoscale zerovalent iron (S-NZVI) was prepared by pre-sulfide synthesis and characterized. The S-NZVI reaction zone was established in sand columns to study the remediation efficiency of nitrobenzene contaminated groundwater. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) characterization tests showed that ferrous sulfide coating on the surface of Fe(0), which could inhibit the aggregation of S-NZVI particles, thus showed better dispersibility. Compared with NZVI, S-NZVI has higher degradation efficiency for NB, and the highest degradation efficiency was 99.65%. The degradation process of NB by S-NZVI conformed pseudo-first-order kinetics. It has stronger penetrating ability in sand column. The removal mechanism of S-NZVI on NB was that NB was quickly adsorbed on the surface and then further degraded by chemical reduction, so NB removal was faster and aniline formatioon was slower. The S-NZVI reaction zone had a large reduction of NB in the leakage zone. Increasing the single-well S-NZVI injection volume and adding injection well both improved the remediation efficiency. The cumulative removal efficiency of NB in the 7days was up to 87.43%, but the NB concentration in the first 2d was still high. The S-NZVI reaction zone showed better remediation effect in the transmission zone. Adding injection well showed better persistence and NB removal rate than increasing S-NZVI injection volume in the single well, and the cumulative removal efficiency of NB in the 7days was up to 99.90%.

Key words： sulfidated-nanoscale zerovalent iron nitrobenzene reaction zone groundwater in-site remediation

Received: 03 July 2019

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X532

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	Articles by authors
	ZHU Ying-yi
	WANG Cheng-chen
	WANG Ming-xin
	XUE Jin-juan
	HAN Ying

Cite this article:

ZHU Ying-yi,WANG Cheng-chen,WANG Ming-xin等. Remediation of nitrobenzene contaminated groundwater by S-NZVI reaction zone[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(2): 670-680.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I2/670

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