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Abstract <p>The research presented in this study explores the synthesis of palladium nanoparticles supported on silica (Pd/SiO<sub>2</sub>) through gamma-ray irradiation, utilizing the facilities at the Isfahan miniature neutron source reactor (MNSR). This innovative approach involves the use of a specially designed irradiation cell to selectively filter and direct gamma radiation for the reduction Pd<sup>2+</sup> ions and deposition of Pd onto SiO<sub>2</sub> substrates, resulting in the formation of Pd/SiO<sub>2</sub> nanoparticles. Comprehensive characterization of these nanoparticles was performed using techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis (EDXA), and elemental mapping, confirming the uniform dispersion of palladium within the silica matrix and an average nanoparticle size of 90 ± 8&#xa0;nm. The catalytic efficacy of the synthesized Pd/SiO<sub>2</sub> nanoparticles was assessed in the context of decolorizing aqueous solutions of organic dyes, specifically methylene blue (MB), Congo red (CR), and methyl orange (MO). Utilizing sodium borohydride (NaBH<sub>4</sub>) as a reducing agent, the nanoparticles demonstrated exceptional catalytic performance, achieving decolorization efficiencies exceeding 98% for initial dye concentrations of 10&#xa0;mg/L within remarkably short timeframes: 3&#xa0;s for MB, 45&#xa0;s for CR, and 7&#xa0;min for MO. These findings underscore the potential of Pd/SiO<sub>2</sub> nanoparticles as effective catalysts in environmental applications involving dye reduction and decolorization.</p> Graphical Abstract <p></p>

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Synthesis of Pd/SiO2 nanoparticles in MNSR reactor and its catalytical application in reduction decolorization of aqueous organic dyes

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • M. Bagherzadeh,
  • J. Mokhtari,
  • M. H. Choopan Dastjerdi,
  • F. Abadian-Naeini,
  • M. Mohsennia

摘要

Abstract

The research presented in this study explores the synthesis of palladium nanoparticles supported on silica (Pd/SiO2) through gamma-ray irradiation, utilizing the facilities at the Isfahan miniature neutron source reactor (MNSR). This innovative approach involves the use of a specially designed irradiation cell to selectively filter and direct gamma radiation for the reduction Pd2+ ions and deposition of Pd onto SiO2 substrates, resulting in the formation of Pd/SiO2 nanoparticles. Comprehensive characterization of these nanoparticles was performed using techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis (EDXA), and elemental mapping, confirming the uniform dispersion of palladium within the silica matrix and an average nanoparticle size of 90 ± 8 nm. The catalytic efficacy of the synthesized Pd/SiO2 nanoparticles was assessed in the context of decolorizing aqueous solutions of organic dyes, specifically methylene blue (MB), Congo red (CR), and methyl orange (MO). Utilizing sodium borohydride (NaBH4) as a reducing agent, the nanoparticles demonstrated exceptional catalytic performance, achieving decolorization efficiencies exceeding 98% for initial dye concentrations of 10 mg/L within remarkably short timeframes: 3 s for MB, 45 s for CR, and 7 min for MO. These findings underscore the potential of Pd/SiO2 nanoparticles as effective catalysts in environmental applications involving dye reduction and decolorization.

Graphical Abstract