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<p>This study investigates cobalt-doped Mn<sub>x</sub>Co<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> and MnFe<sub>2</sub>O<sub>4</sub> nanoparticles synthesized via co-precipitation, demonstrating significant improvements in their structural, optical, magnetic, and dielectric properties. XRD analysis shows lattice contraction (8.871&#xa0;Å to 8.631&#xa0;Å) and increased crystallite size (12&#xa0;nm to 14&#xa0;nm) due to cation redistribution. FTIR confirms the spinel ferrite phase through vibrational modes. UV–Vis spectroscopy indicates bandgap reduction (2.09&#xa0;eV to 1.75&#xa0;eV), which enhances electronic interactions. SEM–EDX confirms uniform morphology and stoichiometry. The photocatalytic degradation study enhanced methylene blue using MnFe<sub>2</sub>O<sub>4</sub> and Co-doped MnxCo₁₋ₓFe<sub>2</sub>O<sub>4</sub> nanocomposites under visible light, highlighting the superior performance of cobalt-incorporated catalysts due to improved light absorption and charge separation. VSM analysis reveals a fivefold increase in saturation magnetization (from 42.35 to 55.39&#xa0;emu/g) and a significant modulation of coercivity (Hc = 242.03 Oe), attributed to superexchange interactions. Dielectric studies demonstrate enhanced charge storage capacity (<i>P</i><sub>r</sub> = 0.76 <i>μ</i>C/cm<sup>2</sup>) and high efficiency (<i>η</i> = 91%). Further, LC–MS data reveal the successful fragmentation of the MB dye into small fragments by Mn<sub>x</sub>Co<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> enhances degradation results. Additionally, improved kinetics in methylene blue dye degradation and excellent recyclability underscore their potential as catalysts. These findings suggest that Mn<sub>x</sub>Co<sub>1-x</sub>Fe<sub>2</sub>O<sub>4</sub> nanoferrites are promising candidates for energy storage, magnetoelectric devices, and environmentally friendly catalytic applications.</p>

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Co-doping in manganese ferrite nanoparticles: tailoring structural, electrical, and magnetic properties for visible light-driven enhanced catalytic dye degradation applications

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • Meena Nanjappan,
  • Hemamalini Rajagopalan,
  • P. Elaiyaraja,
  • Venkatraj Athikesavan,
  • P. S. Nandisha

摘要

This study investigates cobalt-doped MnxCo1-xFe2O4 and MnFe2O4 nanoparticles synthesized via co-precipitation, demonstrating significant improvements in their structural, optical, magnetic, and dielectric properties. XRD analysis shows lattice contraction (8.871 Å to 8.631 Å) and increased crystallite size (12 nm to 14 nm) due to cation redistribution. FTIR confirms the spinel ferrite phase through vibrational modes. UV–Vis spectroscopy indicates bandgap reduction (2.09 eV to 1.75 eV), which enhances electronic interactions. SEM–EDX confirms uniform morphology and stoichiometry. The photocatalytic degradation study enhanced methylene blue using MnFe2O4 and Co-doped MnxCo₁₋ₓFe2O4 nanocomposites under visible light, highlighting the superior performance of cobalt-incorporated catalysts due to improved light absorption and charge separation. VSM analysis reveals a fivefold increase in saturation magnetization (from 42.35 to 55.39 emu/g) and a significant modulation of coercivity (Hc = 242.03 Oe), attributed to superexchange interactions. Dielectric studies demonstrate enhanced charge storage capacity (Pr = 0.76 μC/cm2) and high efficiency (η = 91%). Further, LC–MS data reveal the successful fragmentation of the MB dye into small fragments by MnxCo1-xFe2O4 enhances degradation results. Additionally, improved kinetics in methylene blue dye degradation and excellent recyclability underscore their potential as catalysts. These findings suggest that MnxCo1-xFe2O4 nanoferrites are promising candidates for energy storage, magnetoelectric devices, and environmentally friendly catalytic applications.