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<p>Dye-polluted wastewater and antibiotic-resistant bacteria present urgent environmental and health challenges. Multifunctional nanomaterials with both photocatalytic and antibacterial properties offer a sustainable solution. This study biosynthesized neodymium-doped manganese dioxide (Nd/MnO<sub>2</sub>) nanoparticles via a green method and evaluated their structural, optical, photocatalytic, and antibacterial performance. Nd/MnO<sub>2</sub> was synthesized using <i>Adenanthera pavonina L.</i> leaf extract as a capping and stabilizing agent. Characterization included XRD (tetragonal α-MnO<sub>2</sub>, crystallite size reduced from 13.9 To 12.5&#xa0;nm after Nd doping), FT-IR (O–Mn–O stretching at 464&#xa0;cm<sup>-1</sup> with reduced intensity), TGA (stability up To 1000&#xa0;°C), DRS UV–Vis (red shift 323→327&#xa0;nm; band gap 2.6→2.3&#xa0;eV), FESEM/TEM (hierarchical nanoflowers, ~ 28.5&#xa0;nm size), EDX/mapping (uniform Nd, Mn, O distribution, Nd 2.2 wt%), and XPS. Under visible light, Nd/MnO<sub>2</sub> degraded Congo red (84.52%), Brilliant green (88.18%), and Nile blue A (82.98%) within 120&#xa0;min, following pseudo-first-order kinetics. Antibacterial testing revealed strong inhibition zones, with the highest (23&#xa0;mm) against <i>Staphylococcus aureus</i>. Green-synthesized Nd/MnO<sub>2</sub> nanoparticles show high crystallinity, thermal stability, enhanced visible-light absorption, and synergistic photocatalytic–antibacterial activity, making them promising for textile dye wastewater remediation and antimicrobial applications. </p> Graphical Abstract <p></p>

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Nd/MnO2 Bio-nanomaterial: Synergistic Enhancement of Antimicrobial Activity and Photocatalytic Dye Degradation

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Divya T,
  • Prashanna Suvaitha S,
  • Niveditha S,
  • Venkatachalam K

摘要

Dye-polluted wastewater and antibiotic-resistant bacteria present urgent environmental and health challenges. Multifunctional nanomaterials with both photocatalytic and antibacterial properties offer a sustainable solution. This study biosynthesized neodymium-doped manganese dioxide (Nd/MnO2) nanoparticles via a green method and evaluated their structural, optical, photocatalytic, and antibacterial performance. Nd/MnO2 was synthesized using Adenanthera pavonina L. leaf extract as a capping and stabilizing agent. Characterization included XRD (tetragonal α-MnO2, crystallite size reduced from 13.9 To 12.5 nm after Nd doping), FT-IR (O–Mn–O stretching at 464 cm-1 with reduced intensity), TGA (stability up To 1000 °C), DRS UV–Vis (red shift 323→327 nm; band gap 2.6→2.3 eV), FESEM/TEM (hierarchical nanoflowers, ~ 28.5 nm size), EDX/mapping (uniform Nd, Mn, O distribution, Nd 2.2 wt%), and XPS. Under visible light, Nd/MnO2 degraded Congo red (84.52%), Brilliant green (88.18%), and Nile blue A (82.98%) within 120 min, following pseudo-first-order kinetics. Antibacterial testing revealed strong inhibition zones, with the highest (23 mm) against Staphylococcus aureus. Green-synthesized Nd/MnO2 nanoparticles show high crystallinity, thermal stability, enhanced visible-light absorption, and synergistic photocatalytic–antibacterial activity, making them promising for textile dye wastewater remediation and antimicrobial applications.

Graphical Abstract