4.7 Article

Synchronous Efficient Reduction of Cr (VI) and Removal of Total Chromium by Corn Extract/Fe (III) System

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 19, 页码 28552-28564

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-18234-3

关键词

Natural reagent; Cr (VI) remediation; Biomolecules; Iron-chromium coprecipitation; Enhanced remediation

资金

  1. National Natural Science Foundation of China [41530636]
  2. State-Local joint engineering laboratory for control and remediation technologies of petrochemical contaminated site of Jilin University
  3. Key Laboratory of Groundwater Resources and Environment of Ministry of Education (Jilin University)

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A cost-effective and environmentally friendly composite system for remediating Cr(VI)-polluted groundwater was developed in this study. The system utilized corncob extract as an electron donor and Fe(III) as a strengthening reagent to simultaneously reduce Cr(VI) and precipitate Cr(III). The technology provides a new strategy for in situ remediation of Cr(VI) pollution in groundwater, with the advantages of high efficiency, cost reduction, and pH regulation not being required.
In this study, a cost-effective and environmentally friendly composite system for the remediation of Cr (VI)-polluted ground-water was developed. The system of simultaneous reduction of Cr (VI) and precipitation of Cr (III) was innovatively constructed, using corncob extract as electron donor and Fe (III) as strengthening reagent. In the process of the total chromium removal, the addition of alkaline substances was not required, when pH <= 4 it showed an optimal reduction of Cr (VI). In addition, the removal rate of total chromium reached 88% within 120 min. To understand the mechanism of this system, we characterized the corn extract and particulate matter before and after the reaction. Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry suggested that alcohols, phenols, and aldehydes provided the electrons that were required to reduce Cr (VI). As an electron shuttle, Fe (III) improved the efficiency of electron transfer, and Fe (II) and nano-zerovalent iron (nZVI) particles were formed during this process. X-ray diffraction and transmission electron microscopy analyses showed that FeOCl was formed under the action of the plant extract and adsorbed Cr (III), thus reducing total chromium. Both nZVI and FeOCl were covered with a layer of paste cap, which maintained the stability of their physical and chemical properties. The regulation of pH during the repair process was not required, and the cost of the process was significantly reduced. Therefore, this technology provides a new strategy for the in situ remediation of Cr (VI) pollution in groundwater.

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