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<p>Mercury (Hg) contamination in water sources is a critical environmental and public health concern, arising from industrial activities, mining, and improper waste disposal. This study investigates the removal of Hg(II) ions using Fe₃O₄/MgO nanocomposite, a sol–gel-synthesized adsorbent. Structural analysis through X-ray Diffraction (XRD) confirmed the successful formation of cubic Fe₃O₄ and MgO phases, with post-adsorption peak shifts indicating Hg(II) binding. Scanning Electron Microscopy (SEM) revealed a spherical rod-like morphology with an average particle size of 82.9&#xa0;nm, providing abundant active sites for adsorption. Vibrating Sample Magnetometry (VSM) analysis demonstrated a magnetic saturation value of 11.65 emu·g⁻<sup>1</sup>, ensuring easy separation and recovery of the adsorbent. Optimal adsorption conditions were identified as an adsorbent dosage of 0.25&#xa0;g·L⁻<sup>1</sup>, initial Hg(II) concentration of 400&#xa0;mg·L⁻<sup>1</sup>, pH 9, and a 120-min contact time, resulting in a high adsorption capacity of 1554.77&#xa0;mg·g⁻<sup>1</sup> and 97.17% removal efficiency. Adsorption followed the Langmuir isotherm model, suggesting monolayer adsorption, while kinetic analysis indicated a pseudo-second-order mechanism governed by chemisorption. These findings highlight the potential of Fe₃O₄/MgO as an efficient and recyclable adsorbent for Hg(II) removal in water treatment applications.</p>

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Enhanced Mercury Removal from Water Using Fe3O4/MgO Composite Adsorbent

  • 期刊论文

  • 发表日期：

    2025年5月10日

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  • Gurunanthanan Vijayakumar,
  • Kapila Bandara Wijayaratne,
  • Chamanei Sandamali Perera

摘要

Mercury (Hg) contamination in water sources is a critical environmental and public health concern, arising from industrial activities, mining, and improper waste disposal. This study investigates the removal of Hg(II) ions using Fe₃O₄/MgO nanocomposite, a sol–gel-synthesized adsorbent. Structural analysis through X-ray Diffraction (XRD) confirmed the successful formation of cubic Fe₃O₄ and MgO phases, with post-adsorption peak shifts indicating Hg(II) binding. Scanning Electron Microscopy (SEM) revealed a spherical rod-like morphology with an average particle size of 82.9 nm, providing abundant active sites for adsorption. Vibrating Sample Magnetometry (VSM) analysis demonstrated a magnetic saturation value of 11.65 emu·g⁻1, ensuring easy separation and recovery of the adsorbent. Optimal adsorption conditions were identified as an adsorbent dosage of 0.25 g·L⁻1, initial Hg(II) concentration of 400 mg·L⁻1, pH 9, and a 120-min contact time, resulting in a high adsorption capacity of 1554.77 mg·g⁻1 and 97.17% removal efficiency. Adsorption followed the Langmuir isotherm model, suggesting monolayer adsorption, while kinetic analysis indicated a pseudo-second-order mechanism governed by chemisorption. These findings highlight the potential of Fe₃O₄/MgO as an efficient and recyclable adsorbent for Hg(II) removal in water treatment applications.