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<p>Iron oxide nanoparticles (IONPs) are among the most extensively employed photocatalysts for the treatment of recalcitrant organic contaminants. In this research, Fe<sub>2</sub>O<sub>3</sub> nanoparticles were synthesized through a simple chemical precipitation method, using different concentrations of ammonia as a morphology-directing agent. The nanoparticles’ structure, phase, and elemental composition were characterized by XRD, Raman, and FESEM-EDX, while UV–Visible and PL analyses revealed their optical properties. The synthesized Fe<sub>2</sub>O<sub>3</sub> nanoparticles exhibited an optical bandgap between 1.95 and 2.02&#xa0;eV. Among the prepared nanoparticles, the one synthesized with an optimum ammonia concentration (0.2&#xa0;M) demonstrated the highest photocatalytic efficiency, achieving nearly 90% degradation of methylene blue under visible light in 120&#xa0;min. The reaction kinetics followed a pseudo-first-order model, indicating efficient charge transfer and surface reactivity. These results emphasize the strong photocatalytic activity and stability of ammonia-modified Fe<sub>2</sub>O<sub>3</sub> nanoparticles, making them promising materials for dye degradation and wastewater purification.</p>

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Influence of Ammonia Concentration on Hematite Nanoparticle Properties and Photocatalytic Performance

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Krishnaveni Murari,
  • Y. Vijayakumar

摘要

Iron oxide nanoparticles (IONPs) are among the most extensively employed photocatalysts for the treatment of recalcitrant organic contaminants. In this research, Fe2O3 nanoparticles were synthesized through a simple chemical precipitation method, using different concentrations of ammonia as a morphology-directing agent. The nanoparticles’ structure, phase, and elemental composition were characterized by XRD, Raman, and FESEM-EDX, while UV–Visible and PL analyses revealed their optical properties. The synthesized Fe2O3 nanoparticles exhibited an optical bandgap between 1.95 and 2.02 eV. Among the prepared nanoparticles, the one synthesized with an optimum ammonia concentration (0.2 M) demonstrated the highest photocatalytic efficiency, achieving nearly 90% degradation of methylene blue under visible light in 120 min. The reaction kinetics followed a pseudo-first-order model, indicating efficient charge transfer and surface reactivity. These results emphasize the strong photocatalytic activity and stability of ammonia-modified Fe2O3 nanoparticles, making them promising materials for dye degradation and wastewater purification.