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Adsorption of Malachite Green and Pb 2+ by KMnO 4 -Modified Biochar: Insights and Mechanisms

Author

Listed:
  • Hua Deng

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Junyu Zhang

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Rui Huang

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Wei Wang

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Mianwu Meng

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Lening Hu

    (Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Guangxi Normal University, Guilin 541004, China
    College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

  • Weixing Gan

    (College of Environment and Resources, Guangxi Normal University, Guilin 541004, China)

Abstract

In this study, the feasibility and mechanism of Pb 2+ and malachite green (MG) adsorption from wastewater using KMnO 4 -modified bamboo biochar (KBC) was evaluated. The KBC was characterized by SEM–EDS, XRD, FTIR and XPS. The adsorption results for Pb 2+ conformed to pseudo-second-order kinetics and the Langmuir model theory. Unlike the case for Pb 2+ , the Freundlich model better described the adsorption behaviour of MG, indicating that adsorption occurred within multiple molecular layers. Both pseudo-first-order kinetics and pseudo-second-order kinetics fit the MG adsorption data well, indicating that physical adsorption was involved in the adsorption process. In addition, the maximum adsorption capacity for Pb 2+ /MG was 123.47/1111.11 mg·g −1 , KBC had high adsorption capacities for Pb 2+ and MG, and the mechanisms of Pb 2+ adsorption were mineral precipitation, functional group complexation, and cation-π interactions, while the main mechanisms for MG adsorption were pore filling, π–π interactions, and functional group complexation. In this study, KMnO 4 -modified biochar was prepared and used as an efficient adsorbent, and showed good application prospects for treatment of wastewater containing MG and Pb 2+ .

Suggested Citation

  • Hua Deng & Junyu Zhang & Rui Huang & Wei Wang & Mianwu Meng & Lening Hu & Weixing Gan, 2022. "Adsorption of Malachite Green and Pb 2+ by KMnO 4 -Modified Biochar: Insights and Mechanisms," Sustainability, MDPI, vol. 14(4), pages 1-14, February.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:4:p:2040-:d:746699
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