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<p>This study investigates the synthesis and performance of a biochar-based composite, integrating montmorillonite (MMT) and ZnAl layered double hydroxide (LDH), for the removal of Fe and Mn from acid mine drainage. The biochar_MMT_ZnAl LDH composite, synthesized from solid waste materials, was characterized using BET, XRD, FTIR, TGA, and SEM-EDS analyses. The material demonstrated a surface area of 117.54 m<sup>2</sup>/g and a pore volume of 0.21 cm<sup>3</sup>/g, significantly surpassing non-composite biochar with a surface area of 14.81 m<sup>2</sup>/g. The batch sorption experiment showed rapid adsorption kinetics, achieving 99% Mn removal within 7&#xa0;min at 0.5&#xa0;g adsorbent dosage, reducing Mn concentration from 100&#xa0;mg/L to 0.07&#xa0;mg/L. For Fe, an 87% reduction was achieved after 400&#xa0;min using 0.5&#xa0;g of plain biochar, while biochar_MMT_ZnAl LDH showed superior adsorption performance with a final Fe concentration below 0.07&#xa0;mg/L. Adsorption isotherm analysis indicated that biochar followed the Dubinin–Radushkevich model, while the composites adhered to the Redlich–Peterson model. Kinetic studies revealed a strong fit with the Pseudo-Second-Order model (R<sup>2</sup> = 1 for biochar_MMT), suggesting chemisorption as the dominant mechanism. Thermodynamic analysis confirmed the spontaneity and endothermic nature of the adsorption process, with ΔG values ranging from − 18,758 to − 92,932&#xa0;J/mol for Fe and Mn removal. The findings highlight the potential of biochar-based composites in developing cost-effective and environmentally sustainable solutions for acid mine drainage treatment.</p>

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Biochar MMT ZnAl LDH composite materials derived from solid waste for heavy metal removal in artificial acid mine drainage

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月28日

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  • Yudha Gusti Wibowo,
  • Hana Safitri,
  • Kusumawati,
  • Wahyu Dera Aini,
  • Richar Farantino,
  • Simparmin Br Ginting,
  • Asnan Rinovian,
  • Setyo Budi Kurniawan,
  • Khairurrijal Khairurrijal,
  • Tarmizi Taher,
  • Wida Banar Kusumaningrum,
  • Sudibyo Sudibyo,
  • Ahmad Tawfiequrrahman Yuliansyah,
  • Himawan Tri Bayu Murti Petrus

摘要

This study investigates the synthesis and performance of a biochar-based composite, integrating montmorillonite (MMT) and ZnAl layered double hydroxide (LDH), for the removal of Fe and Mn from acid mine drainage. The biochar_MMT_ZnAl LDH composite, synthesized from solid waste materials, was characterized using BET, XRD, FTIR, TGA, and SEM-EDS analyses. The material demonstrated a surface area of 117.54 m2/g and a pore volume of 0.21 cm3/g, significantly surpassing non-composite biochar with a surface area of 14.81 m2/g. The batch sorption experiment showed rapid adsorption kinetics, achieving 99% Mn removal within 7 min at 0.5 g adsorbent dosage, reducing Mn concentration from 100 mg/L to 0.07 mg/L. For Fe, an 87% reduction was achieved after 400 min using 0.5 g of plain biochar, while biochar_MMT_ZnAl LDH showed superior adsorption performance with a final Fe concentration below 0.07 mg/L. Adsorption isotherm analysis indicated that biochar followed the Dubinin–Radushkevich model, while the composites adhered to the Redlich–Peterson model. Kinetic studies revealed a strong fit with the Pseudo-Second-Order model (R2 = 1 for biochar_MMT), suggesting chemisorption as the dominant mechanism. Thermodynamic analysis confirmed the spontaneity and endothermic nature of the adsorption process, with ΔG values ranging from − 18,758 to − 92,932 J/mol for Fe and Mn removal. The findings highlight the potential of biochar-based composites in developing cost-effective and environmentally sustainable solutions for acid mine drainage treatment.