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<p>This study explores the combined efficacy of chelation and adsorption in removing heavy metal ions from contaminated soil, demonstrating a synergistic approach for effective remediation. Chelation, facilitated by citric acid, enhances the solubility and mobility of metal ions, preparing them for subsequent adsorption. Activated charcoal, used as the adsorbent, significantly reduces heavy metal concentrations in chelating wastewater. The removal efficiencies followed the trend lead(II) (Pb<sup>2+</sup>) &gt; cadmium(II) (Cd<sup>2+</sup>) &gt; chromium(VI) (Cr<sup>6+</sup>) &gt; nickel(II) (Ni<sup>2+</sup>) &gt; copper(II) (Cu<sup>2+</sup>) &gt; zinc(II) (Zn<sup>2+</sup>), achieving 80%, 78%, 76%, 75%, 72%, and 68%, respectively, under optimal conditions: 0.1&#xa0;M citric acid, pH 3–4, 250&#xa0;rpm agitation, and 120&#xa0;min contact time. Enhanced removal was observed in sandy soil compared to alluvial soil due to its lower organic content and looser structure. Additionally, citric acid demonstrated superior chelation efficiency over acetic acid due to its stronger metal complexation. This dual-method approach provides an eco-friendly and efficient strategy for mitigating soil contamination, reducing heavy metal toxicity, and minimizing environmental and health risks.</p>

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Enhanced heavy metal removal from contaminated soils using chelation and adsorption synergy

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • V. Kumar,
  • C. Rout,
  • J. Singh,
  • S. Malik,
  • A. Umar,
  • A. A. Ibrahim,
  • S. Baskoutas

摘要

This study explores the combined efficacy of chelation and adsorption in removing heavy metal ions from contaminated soil, demonstrating a synergistic approach for effective remediation. Chelation, facilitated by citric acid, enhances the solubility and mobility of metal ions, preparing them for subsequent adsorption. Activated charcoal, used as the adsorbent, significantly reduces heavy metal concentrations in chelating wastewater. The removal efficiencies followed the trend lead(II) (Pb2+) > cadmium(II) (Cd2+) > chromium(VI) (Cr6+) > nickel(II) (Ni2+) > copper(II) (Cu2+) > zinc(II) (Zn2+), achieving 80%, 78%, 76%, 75%, 72%, and 68%, respectively, under optimal conditions: 0.1 M citric acid, pH 3–4, 250 rpm agitation, and 120 min contact time. Enhanced removal was observed in sandy soil compared to alluvial soil due to its lower organic content and looser structure. Additionally, citric acid demonstrated superior chelation efficiency over acetic acid due to its stronger metal complexation. This dual-method approach provides an eco-friendly and efficient strategy for mitigating soil contamination, reducing heavy metal toxicity, and minimizing environmental and health risks.