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<p>Heavy metal pollution is a serious environmental risk worldwide. Environmental-friendly strategies for heavy metal remediation are urgently needed. In this study, the bacterial consortium BR7 was constructed using heavy metal immobilizing bacteria <i>Priestia megaterium</i> B2 and <i>Enterobacter</i> sp<i>.</i> B57. The B2, B57 and BR7 (B2:B57 = 3:2) were immobilized on rice husk biochar (BC)/phosphorus‑modified biochar (PBC) and their effects on remediation of Pb, Cd co-contaminated soil were evaluated. Immobilization increased bacteria viability in heavy metal polluted soil. Addition of bacteria, BC/PBC, and the immobilized bacteria in soil reduced the DTPA-extractable Cd and Pb by 20.00%-62.18% and 10.77%-43.99%, respectively. Accompanied by the conversion of acid extractable Cd, Pb into residual state. Meanwhile, soil urease, sucrase and catalase activity were stimulated and the bacterial community was improved. Importantly, their application enhanced plant growth and reduced Cd, Pb content in pakchoi, the Cd content in shoot and root decreased by 2.45%-16.58% and 17.92%-59.93%, respectively. The Pb content in shoot and root decreased by 7.37%-70.17% and 2.03%-62.64%, respectively. Collectively, the immobilized bacteria exhibited better remediation performance than bacteria, BC/PBC alone, indicating a synergistic effect has occurred. Among them, BR7-PBC showed the best effect. This study provides a feasible way for remediation of heavy metal polluted soil.</p> Graphical Abstract <p></p>

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Bacteria-loaded Biochar (BC)/Phosphorus‑Modified Biochar (PBC): An Efficient Biosorbent for Remediation of Cd and Pb Co-Contaminated Soil

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Ting Wei,
  • Yuyao Wang,
  • Xiulian Ma,
  • Rongyi Hu,
  • Junkang Guo,
  • Li Hua,
  • Xingkai Zhang

摘要

Heavy metal pollution is a serious environmental risk worldwide. Environmental-friendly strategies for heavy metal remediation are urgently needed. In this study, the bacterial consortium BR7 was constructed using heavy metal immobilizing bacteria Priestia megaterium B2 and Enterobacter sp. B57. The B2, B57 and BR7 (B2:B57 = 3:2) were immobilized on rice husk biochar (BC)/phosphorus‑modified biochar (PBC) and their effects on remediation of Pb, Cd co-contaminated soil were evaluated. Immobilization increased bacteria viability in heavy metal polluted soil. Addition of bacteria, BC/PBC, and the immobilized bacteria in soil reduced the DTPA-extractable Cd and Pb by 20.00%-62.18% and 10.77%-43.99%, respectively. Accompanied by the conversion of acid extractable Cd, Pb into residual state. Meanwhile, soil urease, sucrase and catalase activity were stimulated and the bacterial community was improved. Importantly, their application enhanced plant growth and reduced Cd, Pb content in pakchoi, the Cd content in shoot and root decreased by 2.45%-16.58% and 17.92%-59.93%, respectively. The Pb content in shoot and root decreased by 7.37%-70.17% and 2.03%-62.64%, respectively. Collectively, the immobilized bacteria exhibited better remediation performance than bacteria, BC/PBC alone, indicating a synergistic effect has occurred. Among them, BR7-PBC showed the best effect. This study provides a feasible way for remediation of heavy metal polluted soil.

Graphical Abstract