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<p>In recent years, the rapid pace of industrial development has led to more frequent occurrences of molybdenum (Mo) pollution, posing significant threats to environmental safety and the health of humans, flora, and fauna. This study employs a bilayer permeable reactive barrier (PRB) system, utilizing iron-modified biochar (FeBC) and unmodified BC as reactive media to remove Mo(VI) from contaminated water. The results indicate that: (1) FeBC exhibits significantly enhanced adsorption capacity for Mo(VI) compared with unmodified BC, with the isothermal adsorption dominated by monolayer adsorption occurring on a finite number of active sites. (2) Mo(VI) adsorption onto FeBC reaches equilibrium within approximately 8&#xa0;h, achieving an equilibrium adsorption capacity of 155.24&#xa0;mg&#xa0;kg<sup>−1</sup> and following pseudo-first-order kinetic behavior. (3) The adsorption of Mo(VI) onto FeBC occurs predominantly through physical adsorption. (4) The bilayer PRB system effectively removes Mo(VI) while simultaneously reducing the total iron (tFe) concentration in the effluent. This study demonstrates that the integration of FeBC with the bilayer PRB technology effectively removes Mo(VI) while substantially reducing the tFe concentration in the effluent, thereby preventing secondary pollution. Furthermore, this approach effectively minimizes the potential leaching risk of modifying agents from the BC, providing a solid scientific basis and a practical engineering solution for the in situ remediation of heavy metal polluted water.</p>

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Removal of Mo(VI) by Iron-Modified Biochar Based on a Bilayer Permeable Reactive Barrier

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Mengru Li,
  • Meng Tan,
  • Sujing Fu,
  • Peng Liu,
  • Kunpeng Zhou

摘要

In recent years, the rapid pace of industrial development has led to more frequent occurrences of molybdenum (Mo) pollution, posing significant threats to environmental safety and the health of humans, flora, and fauna. This study employs a bilayer permeable reactive barrier (PRB) system, utilizing iron-modified biochar (FeBC) and unmodified BC as reactive media to remove Mo(VI) from contaminated water. The results indicate that: (1) FeBC exhibits significantly enhanced adsorption capacity for Mo(VI) compared with unmodified BC, with the isothermal adsorption dominated by monolayer adsorption occurring on a finite number of active sites. (2) Mo(VI) adsorption onto FeBC reaches equilibrium within approximately 8 h, achieving an equilibrium adsorption capacity of 155.24 mg kg−1 and following pseudo-first-order kinetic behavior. (3) The adsorption of Mo(VI) onto FeBC occurs predominantly through physical adsorption. (4) The bilayer PRB system effectively removes Mo(VI) while simultaneously reducing the total iron (tFe) concentration in the effluent. This study demonstrates that the integration of FeBC with the bilayer PRB technology effectively removes Mo(VI) while substantially reducing the tFe concentration in the effluent, thereby preventing secondary pollution. Furthermore, this approach effectively minimizes the potential leaching risk of modifying agents from the BC, providing a solid scientific basis and a practical engineering solution for the in situ remediation of heavy metal polluted water.