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Solvent-Free Synthesis of Magnetic Sewage Sludge-Derived Biochar for Heavy Metal Removal from Wastewater

Author

Listed:
  • Jiayi Tian

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
    These authors contributed equally to this work.)

  • Kexin Guo

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
    These authors contributed equally to this work.)

  • Yucan Sun

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

  • Ruoxi Lin

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

  • Tan Chen

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

  • Bing Zhang

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

  • Yifei Liu

    (Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, China)

  • Ting Yang

    (College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China)

Abstract

The commonly used two-step and one-pot synthesis methods for producing biochar require the use of iron salt solutions, resulting in the undesirable consequences of energy consumption for dewatering and potential pollution risks. To address this drawback, a magnetic sewage sludge-derived biochar (MSBC-2) was synthesized by a solvent-free method in this study. The pseudo-second-order kinetic model and Langmuir model provided the best fit to the experimental data, implying a monolayered chemisorption process of Pb 2+ , Cd 2+ and Cu 2+ onto MSBC-2. As the reaction temperature increased from 25 °C to 45 °C, the maximum adsorption capacities increased from 113.64 mg·g −1 to 151.52 mg·g −1 for Pb 2+ , from 101.01 mg·g −1 to 109.89 mg·g −1 for Cd 2+ and from 57.80 mg·g −1 to 74.07 mg·g −1 for Cu 2+ , respectively. Thermodynamic parameters (Δ G 0 < 0, Δ S 0 > 0, Δ H 0 > 0) revealed that the adsorption processes of all three metals by MSBC-2 were favourable, spontaneous and endothermic. Surface complexation, cation-π interaction, ion exchange and electrostatic attraction mechanisms were involved in the adsorption of Pb 2+ , Cd 2+ and Cu 2+ onto MSBC-2. Overall, this study will provide a new perspective for the synthesis of magnetic biochar and MSBC-2 shows great potential as an adsorbent for heavy metal removal.

Suggested Citation

  • Jiayi Tian & Kexin Guo & Yucan Sun & Ruoxi Lin & Tan Chen & Bing Zhang & Yifei Liu & Ting Yang, 2022. "Solvent-Free Synthesis of Magnetic Sewage Sludge-Derived Biochar for Heavy Metal Removal from Wastewater," IJERPH, MDPI, vol. 20(1), pages 1-16, December.
    • Handle: RePEc:gam:jijerp:v:20:y:2022:i:1:p:155-:d:1011727
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    References listed on IDEAS

    as
    1. Mohammad Ghorbani & Petr Konvalina & Anna Walkiewicz & Reinhard W. Neugschwandtner & Marek Kopecký & Kazem Zamanian & Wei-Hsin Chen & Daniel Bucur, 2022. "Feasibility of Biochar Derived from Sewage Sludge to Promote Sustainable Agriculture and Mitigate GHG Emissions—A Review," IJERPH, MDPI, vol. 19(19), pages 1-23, October.
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