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Optimization of Mixed-Based Biochar Preparation Process and Adsorption Performance of Lead and Cadmium

Author

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  • Xiaoxian Yuan

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Qiang Wang

    (College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)

  • Zhipu Wang

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Sikai Wu

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Yawei Zhai

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Haibing Zhang

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Lisong Zhou

    (Karamay Shuntong Environmental Technology Co., Ltd., Karamay 834000, China)

  • Bei Lu

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Kefan Chen

    (State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay, Karamay 834000, China)

  • Xinwei Wang

    (College of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China)

Abstract

Irreversible pollution by heavy metals such as lead (Pb) and cadmium (Cd) adversely affects the ecological environment and human health. Due to its high adsorption, microporosity, and specific surface area, biochar possesses excellent potential for use in heavy metal pollution remediation. The preparation of mixed-based biochar from sludge and cotton stalk can solve the problems inherent to pure sludge biochar, such as undeveloped pore structure and a small specific surface area, while resourcefully utilizing both waste biomass types. This study investigated the adsorption capacity for Pb 2+ and Cd 2+ of mixed-based biochar prepared at different pyrolysis temperatures, different pyrolysis residence times, and different cotton stalks percentages. Response surface experiments revealed the optimum process conditions for preparing mixed-based biochar, which included a pyrolysis temperature of 638 °C, a pyrolysis residence time of 86 min, and an addition ratio of 50% for cotton stalks. The isothermal adsorption experiments revealed that the maximum adsorption capacities of mixed-based biochar for Pb 2+ and Cd 2+ were 111.11 and 86.21 mg/g, respectively. Our findings suggest the co-pyrolysis of sludge and cotton stalk as a green and sustainable method for safely disposing of Pb and Cd.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:15:p:11579-:d:1203419
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    References listed on IDEAS

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