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<p>In this work, graphene oxide (GO) nanoparticles were synthesized and subsequently modified using 3-aminopropyltrimethoxysilane (APTMS). An Anderson-type polyoxometalate [(C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>N]<sub>2</sub>[CrMo<sub>6</sub>O<sub>18</sub>(OH)<sub>6</sub>] was then immobilized on the surface of the modified graphene oxide nanoparticles. The obtained catalyst was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDS), inductively coupled plasma (ICP), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Raman spectroscopy, and X-ray diffraction (XRD). The catalytic performance of this recyclable hybrid catalyst was evaluated for the synthesis of benzimidazole derivatives at 75&#xa0;°C under solvent-based conditions. The hybrid catalyst demonstrated easy separation and could be successfully reused at least six times with only a slight reduction in the yield of the desired product. Leaching and recovery tests, along with FT-IR analysis, confirmed the high stability of the catalytically active species and the heterogeneous nature of the catalyst.</p>

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Polyoxometalate on functionalized graphene sheets as a hybrid catalyst for efficient synthesis of benzimidazoles

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月6日

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  • Soghra Hossinimotlagh,
  • Ali Zarnegaryan,
  • Zahra Dehbanipour

摘要

In this work, graphene oxide (GO) nanoparticles were synthesized and subsequently modified using 3-aminopropyltrimethoxysilane (APTMS). An Anderson-type polyoxometalate [(C4H9)4N]2[CrMo6O18(OH)6] was then immobilized on the surface of the modified graphene oxide nanoparticles. The obtained catalyst was characterized using Fourier-transform infrared spectroscopy (FT-IR), energy-dispersive X-ray spectroscopy (EDS), inductively coupled plasma (ICP), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Raman spectroscopy, and X-ray diffraction (XRD). The catalytic performance of this recyclable hybrid catalyst was evaluated for the synthesis of benzimidazole derivatives at 75 °C under solvent-based conditions. The hybrid catalyst demonstrated easy separation and could be successfully reused at least six times with only a slight reduction in the yield of the desired product. Leaching and recovery tests, along with FT-IR analysis, confirmed the high stability of the catalytically active species and the heterogeneous nature of the catalyst.