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<p>No previous studies focus on immobilizing Cu(II) in soil resulting from the long-term use of cupric fungicides, using biochar (BC) and Fe<sub>3</sub>O<sub>4</sub> magnetic biochar (MBC) derived from grapevine pruning residue, which can support Zero Waste strategies in vineyards. Therefore, we aim to assess the impact of the production conditions on material properties and to clarify the mechanisms of Cu(II) adsorption onto BC, MBC, and soil. Results indicate that as the pyrolysis temperature increases, there is a noticeable rise in aromatization and a more defined structure in the pristine biochar. Meanwhile, MBC exhibits a more heterogeneous structure with the successful synthesis. Compared to the original soil, soil amended with BC and MBC shows significantly higher Cu(II) adsorption and lower EDTA-extractable Cu. The nonlinearized adsorption regression presents a good fit of all experimental data to Langmuir and Freundlich models, which involves both monolayer and multilayer mechanisms. Although showing a slightly lower effective fit with both models (0.90 &lt; R<sup>2</sup> &lt; 0.96), MBCs demonstrate characteristics of both monolayer and multilayer adsorption. This confirms that MBCs have more active binding sites (carboxylates, hydroxyls, and Fe–O bonds), enhancing the Cu(II) adsorption compared to other studied adsorbents. Accordingly, MBC produced at 600&#xa0;°C achieves the maximum adsorption capacity (36.68&#xa0;mg/g) and the strongest Freundlich constant (K<sub>F</sub> = 8.06). Overall, this study reveals significant potential of the studied BC and MBC for Cu(II) immobilization in soil and Cu(II) adsorption in liquid phase. Therefore, these materials are suitable for further research on their application in soil and water Cu-pollution treatment under field conditions.</p>

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Potential of Biochar and Magnetic Biochar Generated from Grapevine Pruning Residue to Immobilize Cu(II) in the Vineyard Soil

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Nhung Thi Ha Pham,
  • Manh Luong Tuan Dang,
  • Truong Viet Nguyen

摘要

No previous studies focus on immobilizing Cu(II) in soil resulting from the long-term use of cupric fungicides, using biochar (BC) and Fe3O4 magnetic biochar (MBC) derived from grapevine pruning residue, which can support Zero Waste strategies in vineyards. Therefore, we aim to assess the impact of the production conditions on material properties and to clarify the mechanisms of Cu(II) adsorption onto BC, MBC, and soil. Results indicate that as the pyrolysis temperature increases, there is a noticeable rise in aromatization and a more defined structure in the pristine biochar. Meanwhile, MBC exhibits a more heterogeneous structure with the successful synthesis. Compared to the original soil, soil amended with BC and MBC shows significantly higher Cu(II) adsorption and lower EDTA-extractable Cu. The nonlinearized adsorption regression presents a good fit of all experimental data to Langmuir and Freundlich models, which involves both monolayer and multilayer mechanisms. Although showing a slightly lower effective fit with both models (0.90 < R2 < 0.96), MBCs demonstrate characteristics of both monolayer and multilayer adsorption. This confirms that MBCs have more active binding sites (carboxylates, hydroxyls, and Fe–O bonds), enhancing the Cu(II) adsorption compared to other studied adsorbents. Accordingly, MBC produced at 600 °C achieves the maximum adsorption capacity (36.68 mg/g) and the strongest Freundlich constant (KF = 8.06). Overall, this study reveals significant potential of the studied BC and MBC for Cu(II) immobilization in soil and Cu(II) adsorption in liquid phase. Therefore, these materials are suitable for further research on their application in soil and water Cu-pollution treatment under field conditions.