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<p>In response to the growing environmental challenge of water pollution from industrial dyes, this study advances the Clean Water and Sanitation goal by developing an eco-friendly route for synthesizing spinel-type MgFe₂O₄ and MgFe₂O₄/bentonite magnetic nanocomposites via a self-combustion method. XRD analyses confirmed the successful formation of the spinel MgFe₂O₄ phase, while the natural minerals (SiO₂, Al₂O₃) introduced through bentonite enhanced the adsorption performance. The prepared materials efficiently removed the hazardous organic dye methyl orange (MO) from aqueous media. The effects of operational parameters such as contact time, initial dye concentration, and pH were systematically evaluated. Kinetic and isotherm studies revealed that the adsorption process follows <b>a</b> pseudo-second-order model, fitting both Langmuir and Freundlich isotherms, with maximum adsorption capacities of 128&#xa0;mg&#xa0;g⁻<sup>1</sup> for MgFe₂O₄ and 140&#xa0;mg&#xa0;g⁻<sup>1</sup> for MgFe₂O₄/bentonite. Thermodynamic analyses confirmed the spontaneous and feasible nature of adsorption, while the magnetic properties of the nanocomposites enabled easy recovery and reuse. Overall, this work demonstrates the environmentally sustainable potential of MgFe₂O₄-based nanomaterials as efficient, recyclable adsorbents for wastewater purification and environmental remediation.</p>

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Green synthesis of MgFe₂O₄ and MgFe₂O₄/bentonite magnetic nanocomposites for the environmental remediation of dye-contaminated water

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Sarra Ben Amor,
  • Sami Ameur

摘要

In response to the growing environmental challenge of water pollution from industrial dyes, this study advances the Clean Water and Sanitation goal by developing an eco-friendly route for synthesizing spinel-type MgFe₂O₄ and MgFe₂O₄/bentonite magnetic nanocomposites via a self-combustion method. XRD analyses confirmed the successful formation of the spinel MgFe₂O₄ phase, while the natural minerals (SiO₂, Al₂O₃) introduced through bentonite enhanced the adsorption performance. The prepared materials efficiently removed the hazardous organic dye methyl orange (MO) from aqueous media. The effects of operational parameters such as contact time, initial dye concentration, and pH were systematically evaluated. Kinetic and isotherm studies revealed that the adsorption process follows a pseudo-second-order model, fitting both Langmuir and Freundlich isotherms, with maximum adsorption capacities of 128 mg g⁻1 for MgFe₂O₄ and 140 mg g⁻1 for MgFe₂O₄/bentonite. Thermodynamic analyses confirmed the spontaneous and feasible nature of adsorption, while the magnetic properties of the nanocomposites enabled easy recovery and reuse. Overall, this work demonstrates the environmentally sustainable potential of MgFe₂O₄-based nanomaterials as efficient, recyclable adsorbents for wastewater purification and environmental remediation.