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Solvent-Free Synthesis of MnOx-FeOx/Biochar for Hg0 and o-Xylene Removal from Flue Gas

  • Xiao Zhang
    Xiao Zhang
    School of Energy and Environmental Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    More by Xiao Zhang
  • Kai Ren
    Kai Ren
    School of Energy and Environmental Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    More by Kai Ren
  • Yuting Wang
    Yuting Wang
    School of Energy and Environmental Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    More by Yuting Wang
  • Boxiong Shen*
    Boxiong Shen
    School of Energy and Environmental Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    *Email: [email protected]
    More by Boxiong Shen
  • Feng Shen*
    Feng Shen
    Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, No. 31, Fukang Road, Nankai District, Tianjin 300191, China
    *Email: [email protected]
    More by Feng Shen
  • , and 
  • Yewen Shang
    Yewen Shang
    School of Energy and Environmental Engineering, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    Tianjin Key Laboratory of Clean Energy and Pollution Control, Hebei University of Technology, No. 5340, Xiping Road, Beichen District, Tianjin 300401, China
    More by Yewen Shang
Cite this: Energy Fuels 2021, 35, 19, 15969–15977
Publication Date (Web):September 9, 2021
https://doi.org/10.1021/acs.energyfuels.1c02508
Copyright © 2021 American Chemical Society
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Abstract

Volatile organic compounds (VOCs) and Hg adversely affect the health of communities in coal-based economies in countries that depend on coal-fired power plants. In this study, biochar with incorporated Mn–Fe oxide composite was synthesized by co-ball milling of metal ions and biomass, followed by in situ pyrolysis carbonization and oxidation. The scanning electron microscopy (SEM) result shows that the generated metal oxides were incorporated into the biochar matrix rather than being physically deposited. By avoiding wet impregnation in the MnFe loading process, abundant functional groups were preserved on the surface of the materials. MnFe oxide homogeneity and dispersion on biochar were effectively promoted by mechanochemical synthesis for 4 h and showed high Mn and Fe oxidation states and a large amount of Lewis acid of 56.47 mol/g. Effectively promoted by these properties, the Mn–Fe oxides/biochar composite efficiently purified Hg0 and VOC by adsorption and catalytic oxidation from simulated coal-fired flue gas. The mutual inhibitory effect between Hg0 and o-xylene is pounced at high reaction temperatures when catalytic oxidation dominated. The mechanochemical strategy endowed the Mn–Fe oxides/biochar composite with strong magnetic properties, showing a saturation magnetization of 24.33 emu/g, which enabled 100% separation of the material from coal-fired fly ash.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.energyfuels.1c02508.

  • Details of H2-TPR and py-FTIR characterizations, pore size distributions and N2 adsorption–desorption isotherm profile (figures), and chemical composition of untreated fly ash (tables) (PDF)

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