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<p>In this work, manganese ferrite (MnFe<sub>2</sub>O<sub>4</sub>)- modified sludge biochar (MFC) was effectively synthesized through a co-precipitation for eliminating Cr(VI) from tailings wastewater. Analytical methods, including SEM, XRD, FTIR, XPS, and N₂ adsorption–desorption analysis, revealed that the loading of MnFe<sub>2</sub>O<sub>4</sub> significantly enhanced the surface area (from 8.215 m<sup>2</sup>/g to 63.258 m<sup>2</sup>/g) and pore structure while introducing abundant oxygen-containing functional groups and Fe<sup>2</sup>⁺/Mn<sup>2</sup>⁺ active sites. Adsorption experiments demonstrated that MFC achieved a Cr(VI) removal efficiency of 94.53% for a 100 mg/L Cr(VI) solution at pH 3, with the removal process fitting well with the pseudo-second-order and the Langmuir. Mechanistic studies indicated that Cr(VI) removal was accomplished through a synergistic mechanism of electrostatic adsorption-reduction-complexation. This research provides a novel adsorbent design strategy for the cost-effective and efficient treatment of acidic chromium-containing wastewater.</p> Graphical Abstract <p></p>

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MnFe2O4-Functionalized Sludge Biochar for Removing Cr(VI) from Tailings Wastewater: Adsorption Behavior and Mechanisms

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • Zhiping Li,
  • Yi Zhou,
  • Quan Yin,
  • Lidong Ma

摘要

In this work, manganese ferrite (MnFe2O4)- modified sludge biochar (MFC) was effectively synthesized through a co-precipitation for eliminating Cr(VI) from tailings wastewater. Analytical methods, including SEM, XRD, FTIR, XPS, and N₂ adsorption–desorption analysis, revealed that the loading of MnFe2O4 significantly enhanced the surface area (from 8.215 m2/g to 63.258 m2/g) and pore structure while introducing abundant oxygen-containing functional groups and Fe2⁺/Mn2⁺ active sites. Adsorption experiments demonstrated that MFC achieved a Cr(VI) removal efficiency of 94.53% for a 100 mg/L Cr(VI) solution at pH 3, with the removal process fitting well with the pseudo-second-order and the Langmuir. Mechanistic studies indicated that Cr(VI) removal was accomplished through a synergistic mechanism of electrostatic adsorption-reduction-complexation. This research provides a novel adsorbent design strategy for the cost-effective and efficient treatment of acidic chromium-containing wastewater.

Graphical Abstract