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<p>The Fenton process is a promising technology for degrading refractory organic pollutants, but its practical application is restricted by low pH requirement and high sludge production. To address these challenges, this study developed a novel iron-montmorillonite (Fe-MMT)/H₂O₂/Hydroxylamine (HA) Fenton-like system. This system demonstrated remarkable degradation efficiencies to multiple organic pollutants—methyl orange (MO), rhodamine B (RhB), tetracycline (TC), dimethyl phthalate (DMP), and bisphenol A (BPA)—with removal rates exceeding 95% at pH 4 in 1&#xa0;h. Notably, it exhibited high tolerance to a wide range of pH and high salinity of Cl⁻ (100 mmol/L) and NO₃⁻ (100 mmol/L). While, SO₄²⁻ (≥ 10 mmol/L) and PO₄³⁻ (≥ 1 mmol/L) inhibited degradation. This system also has advantages in its exceptional stability and reusability. The Fe-MMT catalyst retained high activity over six consecutive cycles with negligible iron leaching, thereby, the iron sludge production could be significantly reduced. The enhanced performance stems from the confinement effect of montmorillonite, which possesses unique layered structure to concentrate Fe, HA, H₂O₂, and pollutants within the interlayer spaces, thus accelerate reaction kinetics. By combining high catalytic activity, broad pH adaptability, and minimal sludge production, this Fe-MMT/H₂O₂/HA system presents a promising advancement in wastewater treatment, paving the way for more practical and environmentally friendly applications.</p> Graphical Abstract <p></p>

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Hydroxylamine-Promoted Surface Fenton Reaction Over Iron-Montmorillonite for Organic Pollutant Degradation

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Yi Wang,
  • Jian Huang,
  • Zheng Zhang,
  • Wenlin Zhang,
  • Lingxiao Ren,
  • Yongheng Xiong,
  • Anping Peng,
  • Quan Wang,
  • Xi Hong

摘要

The Fenton process is a promising technology for degrading refractory organic pollutants, but its practical application is restricted by low pH requirement and high sludge production. To address these challenges, this study developed a novel iron-montmorillonite (Fe-MMT)/H₂O₂/Hydroxylamine (HA) Fenton-like system. This system demonstrated remarkable degradation efficiencies to multiple organic pollutants—methyl orange (MO), rhodamine B (RhB), tetracycline (TC), dimethyl phthalate (DMP), and bisphenol A (BPA)—with removal rates exceeding 95% at pH 4 in 1 h. Notably, it exhibited high tolerance to a wide range of pH and high salinity of Cl⁻ (100 mmol/L) and NO₃⁻ (100 mmol/L). While, SO₄²⁻ (≥ 10 mmol/L) and PO₄³⁻ (≥ 1 mmol/L) inhibited degradation. This system also has advantages in its exceptional stability and reusability. The Fe-MMT catalyst retained high activity over six consecutive cycles with negligible iron leaching, thereby, the iron sludge production could be significantly reduced. The enhanced performance stems from the confinement effect of montmorillonite, which possesses unique layered structure to concentrate Fe, HA, H₂O₂, and pollutants within the interlayer spaces, thus accelerate reaction kinetics. By combining high catalytic activity, broad pH adaptability, and minimal sludge production, this Fe-MMT/H₂O₂/HA system presents a promising advancement in wastewater treatment, paving the way for more practical and environmentally friendly applications.

Graphical Abstract