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<p>In recent years, soil heavy metal pollution and the accumulation of tailings and food waste cannot be ignored. Currently, soil remediation agents are expensive or have poor remediation effects. In this experiment, alkali-modified tailings biochar composite (MTB) was prepared by low-temperature pyrolysis using tailings and food waste as raw materials for the remediation of soil heavy metal Cd. MTB has a large number of oxygen-containing functional groups on its surface (Si–O, Fe–O, -OH, C-O, -COOH), which is favorable for the adsorption of the heavy metal Cd. The adsorption behavior is consistent with the Langmuir model and the proposed second-order kinetic equation, and the adsorption mechanism is mainly complexation and precipitation. 650&#xa0;°C pyrolysis preparation of MTB3 reduced bioavailable cadmium by 83% in 35&#xa0;days, and the active Cd was transformed into inactive Cd. Potting experiments showed that ryegrass biomass significantly increased.Adding 8% MTB3 to ryegrass significantly reduced Cd accumulation, lowering available cadmium by 86.4% in 35&#xa0;days compared to the control (CK). Tailings biochar improved soil properties, boosting plant germination and height by 26.94% to 106%. The study showed that tailings biochar composites have good prospects for remediation of soil heavy metal Cd pollution.</p> Graphical Abstract <p></p>

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Performance and Mechanism of Tailings Biochar Composites for Synergistic Phytoremediation of Soil Heavy Metal Cd

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Han Zhang,
  • Xiaodong Wu,
  • Qiao Zhang,
  • Gang Xue,
  • Xinhui Duan,
  • Jinsheng Liang,
  • Cairong Gong

摘要

In recent years, soil heavy metal pollution and the accumulation of tailings and food waste cannot be ignored. Currently, soil remediation agents are expensive or have poor remediation effects. In this experiment, alkali-modified tailings biochar composite (MTB) was prepared by low-temperature pyrolysis using tailings and food waste as raw materials for the remediation of soil heavy metal Cd. MTB has a large number of oxygen-containing functional groups on its surface (Si–O, Fe–O, -OH, C-O, -COOH), which is favorable for the adsorption of the heavy metal Cd. The adsorption behavior is consistent with the Langmuir model and the proposed second-order kinetic equation, and the adsorption mechanism is mainly complexation and precipitation. 650 °C pyrolysis preparation of MTB3 reduced bioavailable cadmium by 83% in 35 days, and the active Cd was transformed into inactive Cd. Potting experiments showed that ryegrass biomass significantly increased.Adding 8% MTB3 to ryegrass significantly reduced Cd accumulation, lowering available cadmium by 86.4% in 35 days compared to the control (CK). Tailings biochar improved soil properties, boosting plant germination and height by 26.94% to 106%. The study showed that tailings biochar composites have good prospects for remediation of soil heavy metal Cd pollution.

Graphical Abstract