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Effect of Pyrolysis Temperature on Removal Efficiency and Mechanisms of Hg(II), Cd(II), and Pb (II) by Maize Straw Biochar

Author

Listed:
  • Xuebo Hu

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China
    School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
    These authors contributed equally to this work.)

  • Ruigang Zhang

    (School of Civil Engineering, Hefei University of Technology, Hefei 230009, China
    These authors contributed equally to this work.)

  • Bing Xia

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China
    School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, China
    Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Rongrong Ying

    (Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Zhewei Hu

    (Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
    State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing 210042, China)

  • Xu Tao

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China)

  • Hao Yu

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China)

  • Fabao Xiao

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China)

  • Qiaoying Chu

    (School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

  • Hongfeng Chen

    (Anhui Provincial Academy of Eco-Environmental Science Research, Hefei 230071, China
    School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

  • Jiazhong Qian

    (School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract

Pyrolysis temperature significantly affects the properties of biochar, which in turn can affect the removal of heavy metal ions and the underlying mechanism. In this work, biochars from the pyrolysis of maize straw at 300, 400, and 500 °C (BC300, BC400, and BC500, respectively) and wheat straw at 400 °C (WBC400) were investigated. The influence of production temperature on the adsorption of Hg 2+ , Cd 2+ , and Pb 2+ by maize straw biochar was investigated by the characterization of the biochars and by adsorption tests. The adsorption capacities of maize and wheat straw biochar were compared in an adsorption experiment. Biochar BC400 showed the best physical and chemical properties and had the largest number of surface functional groups. The pseudo-second-order kinetic model was more suitable for describing the adsorption behavior of metal ions to biochar. The Langmuir model better fit the experimental data. Biochar BC400 had a higher adsorption speed and a stronger adsorption capacity than WBC400. The sorption of Pb 2+ and Hg 2+ to maize straw biochar followed the mechanisms of surface precipitation of carbonates and phosphates and complexation with oxygenated functional groups and delocalized π electrons. The adsorption mechanism for Cd 2+ was similar to those of Hg 2+ and Pb 2+ , but precipitation mainly occurred through the formation of phosphate. In the multi-heavy-metal system, the adsorption of Cd 2+ by BC400 was inhibited by Pb 2+ and Hg 2+ . In summary, BC400 biochar was most suitable for the adsorption effect of heavy metals in aqueous solution.

Suggested Citation

  • Xuebo Hu & Ruigang Zhang & Bing Xia & Rongrong Ying & Zhewei Hu & Xu Tao & Hao Yu & Fabao Xiao & Qiaoying Chu & Hongfeng Chen & Jiazhong Qian, 2022. "Effect of Pyrolysis Temperature on Removal Efficiency and Mechanisms of Hg(II), Cd(II), and Pb (II) by Maize Straw Biochar," Sustainability, MDPI, vol. 14(15), pages 1-16, July.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:15:p:9022-:d:869579
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    References listed on IDEAS

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    1. Liu, Ziqiang & Zhang, Huan & Yu, Xinxiao & Jia, Guodong & Jiang, Jiang, 2021. "Evidence of foliar water uptake in a conifer species," Agricultural Water Management, Elsevier, vol. 255(C).
    2. Chen-Yeon Chu & Jin-Long Zheng & Tsung-Hsien Chen & Prakash Bhuyar, 2021. "High Performance of Biohydrogen Production in Packed-Filter Bioreactor via Optimizing Packed-Filter Position," IJERPH, MDPI, vol. 18(14), pages 1-12, July.
    3. Haixia Wang & Mingliang Zhang & Qi Lv, 2019. "Influence of Pyrolysis Temperature on Cadmium Removal Capacity and Mechanism by Maize Straw and Platanus Leaves Biochars," IJERPH, MDPI, vol. 16(5), pages 1-16, March.
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    Cited by:

    1. Xiaoxian Yuan & Qiang Wang & Zhipu Wang & Sikai Wu & Yawei Zhai & Haibing Zhang & Lisong Zhou & Bei Lu & Kefan Chen & Xinwei Wang, 2023. "Optimization of Mixed-Based Biochar Preparation Process and Adsorption Performance of Lead and Cadmium," Sustainability, MDPI, vol. 15(15), pages 1-13, July.

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