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<p>In this study, Mo-based transition metal oxide nanoparticles MoO<sub>3</sub> (MO), CuMoO<sub>4</sub> (CMO), FeMoO<sub>4</sub> (FMO), and Cu<sub>1.815</sub>Fe<sub>1.815</sub>Mo<sub>3</sub>O<sub>12</sub> (CFMO) were synthesized via a sol-gel technique. Further, evaluated for their photo-Fenton dye degradation performance against Methylene Blue dye under visible light irradiation using H<sub>2</sub>O<sub>2</sub> as an oxidant. Structural, optical, morphological, and surface analyses confirmed the formation of pure-phase nanoparticles with flake-like morphology and tunable band gaps. Optical band gap values decreased from 2.93 eV (MoO<sub>3</sub>) to 1.68-1.80 eV for ternary Cu<sub>1.815</sub>Fe<sub>1.815</sub>Mo<sub>3</sub>O<sub>12</sub>, enhancing visible light absorption. Among all, the ternary oxide with 0.1 M Mo exhibited the highest degradation efficiency of 97.6% within 60 minutes, outperforming the binary (CMO<sub>4</sub>: 97.1%, FMO<sub>4</sub>: 94.1%) and primary (MoO<sub>3</sub>: 98.1% in 180 min) systems. Kinetic studies confirmed first-order degradation behavior with the highest rate constant of 5.9 × 10<sup>-2</sup> min<sup>-1</sup> and shortest half-life of 11.7 minutes for the optimal ternary catalyst. Scavenger experiments further revealed that hydroxyl radicals (•OH) are the dominant reactive species, with moderate contributions from superoxide radicals (•O<sub>2</sub><sup>-</sup>) and photogenerated holes (h<sup>+</sup>). The CFMO nanoparticles also retained their catalytic activity after five consecutive cycles, indicating excellent reusability. These findings demonstrate the promising potential of Mo-incorporated ternary oxide nanoparticles as efficient, cost-effective, and recyclable photo-Fenton catalysts for environmental wastewater remediation.</p>

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Mo-Driven Photo-Fenton Catalysis: Synergistic Role of Cu and Fe in Ternary Oxide Nanoparticles for Wastewater Remediation

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • E. Manjima,
  • T. Raguram,
  • Aparna Sumesh,
  • Vishnu Narayanan,
  • K. S. Rajni,
  • Muthukumar Rajamanickam

摘要

In this study, Mo-based transition metal oxide nanoparticles MoO3 (MO), CuMoO4 (CMO), FeMoO4 (FMO), and Cu1.815Fe1.815Mo3O12 (CFMO) were synthesized via a sol-gel technique. Further, evaluated for their photo-Fenton dye degradation performance against Methylene Blue dye under visible light irradiation using H2O2 as an oxidant. Structural, optical, morphological, and surface analyses confirmed the formation of pure-phase nanoparticles with flake-like morphology and tunable band gaps. Optical band gap values decreased from 2.93 eV (MoO3) to 1.68-1.80 eV for ternary Cu1.815Fe1.815Mo3O12, enhancing visible light absorption. Among all, the ternary oxide with 0.1 M Mo exhibited the highest degradation efficiency of 97.6% within 60 minutes, outperforming the binary (CMO4: 97.1%, FMO4: 94.1%) and primary (MoO3: 98.1% in 180 min) systems. Kinetic studies confirmed first-order degradation behavior with the highest rate constant of 5.9 × 10-2 min-1 and shortest half-life of 11.7 minutes for the optimal ternary catalyst. Scavenger experiments further revealed that hydroxyl radicals (•OH) are the dominant reactive species, with moderate contributions from superoxide radicals (•O2-) and photogenerated holes (h+). The CFMO nanoparticles also retained their catalytic activity after five consecutive cycles, indicating excellent reusability. These findings demonstrate the promising potential of Mo-incorporated ternary oxide nanoparticles as efficient, cost-effective, and recyclable photo-Fenton catalysts for environmental wastewater remediation.