Breakthrough in Photocatalytics: Research on Modified Rare-Earth Manganites Offers Promising Solutions for Environmental Remediation

Strategic Insights -

Researchers at the University of Sharjah have made a significant discovery in the field of nanotechnology-photocatalytics, reporting the synthesis and characterization of two doped rare-earth manganites that exhibit enhanced photocatalytic efficiency. The study, published in Ceramics International, highlights the role of Sr2+ and Pd2+ co-doping in modifying the electronic structure and improving light absorption, charge separation, and photocatalytic degradation of organic dyes.

Key Takeaways:

  • The researchers synthesized two doped rare-earth manganites, Pr0.9Pd0.1Mn0.9O3 and Pr0.8Sr0.1Pd0.1Mn0.9O3, using a conventional solid-state route to investigate their potential for photocatalytic degradation of organic dyes under visible light.
  • X-ray diffraction confirmed that both compounds crystallize in an orthorhombic Pnma structure, with crystallite sizes estimated as ~30 nm (XRD) and ~27 nm (SEM), indicating irregularly agglomerated quasi-spherical nanoparticles.
  • Magnetic measurements indicated complex behavior involving superparamagnetic, spin-glass, and ferromagnetic-paramagnetic transitions, with modified Arrott plots analysis confirming that both compounds fall within the 3D-XY universality class with critical exponents beta = 0.345 and gamma = 1.316 for Sr0.10.
  • UV-visible spectroscopy revealed bandgap tuning from 2.48 eV (Sr0.00) to 2.36 eV (Sr0.10), improving light absorption and charge separation.
  • Photocatalytic experiments using methylene blue dye under visible light showed that Sr doping enhances degradation performance, achieving up to 86% degradation in 6 min at a catalyst loading of 0.006 g/L.
  • The research concluded that the modified perovskites are promising candidates for visible-light-driven environmental remediation.

Statistics:

  • The crystallite sizes of the two doped rare-earth manganites were estimated as ~30 nm (XRD) and ~27 nm (SEM).
  • The critical exponents beta = 0.345 and gamma = 1.316 for Sr0.10 were determined from the modified Arrott plots analysis.
  • Up to 86% degradation of methylene blue dye was achieved in 6 min at a catalyst loading of 0.006 g/L.
  • The bandgap energy decreased from 2.48 eV (Sr0.00) to 2.36 eV (Sr0.10) with Sr doping.

Sources:

  • Influence of Sr 2+ doping On the Structural, Magnetic, and Photocatalytic Behavior of Pr 0.9-x sr x pd 0.1 mn 0.9 o 3 Manganite for Enhanced Methylene Blue Degradation. Ceramics International, 2025;51(24):42005-42015.
  • NewsRx. Researchers from University of Sharjah Report Details of New Studies and Findings in the Area of Photocatalytics (Influence of Sr 2+ doping On the Structural, Magnetic, and Photocatalytic Behavior of ...). Journal of Technology & Science. October 26, 2025; p 4314.