Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (1): 247-255.doi: 10.13278/j.cnki.jjuese.20190207

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Removal of Hexavalent Chromium from Simulated Groundwater by Variety of Iron-Modified and Unmodified Biochars

Wang Sheng1, Feng Xiang2, Li Bing2, Guo Lin2, Cao Kun1, Liu Peng1   

  1. 1. College of Environment, China University of Geosciences, Wuhan 430074, China;
    2. Henan Institute of Geological Survey, Zhengzhou 450001, China
  • Received:2019-09-24 Published:2021-02-02
  • Supported by:
    Supported by the National Natural Science Foundation of China (41877478) and the National Key R&D Program of China (2018YFC1801706-04)

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Abstract: Biochar is usually used in Cr(Ⅵ) removal due to its micro porous structure and huge specific surface area, but different biochar has different removal efficiency. Choosing poplar, willow, peach,and pine as feedstocks, twenty types of biochar were prepared through pyrolysis of the FeCl3-modified and unmodified biomass with different particle sizes at 300 ℃ or 600 ℃, respectively. A batch of experiments were performed to evaluate the efficiency of different biochar in removing hexavalent chromium from the simulated groundwater. The mechanism of Cr(Ⅵ) removal by biochar was investigated using Fourier transform infrared (FTIR) spectroscopy and X-ray absorption near edge spectrum (XANES). The results showed that the removal efficiency of the modified biochar by pyrolysis at 300 ℃ was over 99.0% of Cr(Ⅵ); The biochar (<0.5 mm) showed better removal efficiency than the biochar with a particle size of 2 mm; The Cr (Ⅵ) removal process by FeCl3BC300Y could be well described by the pseudo-first-order equation; XANES analysis suggested that the chromium on FeCl3BC300Y was in a trivalent state, and FTIR analysis indicated that hydroxyl and carboxylate groups contributed to Cr(Ⅵ) removal. The mechanism of Cr(Ⅵ) removal by biochar included reduction and complexation. The biochar modified by iron is expected as a filler material of permeable reactive barriers, and will become a new material to repair groundwater contaminated by hexavalent chromium.

Key words: biochar, iron modified, removal of hexavalent chromium

CLC Number: 

  • X523
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