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<p>Successful synthesis of a silver-decorated reduced graphene oxide (Ag-rGO) nanocomposite and its efficient photocatalytic activity toward dye degradation under sunlight irradiation is reported here. X-ray diffraction (XRD) analysis of this nanocomposite confirms the crystalline nature of Ag NPs on rGO sheets with an estimated crystallite size of the composite around 45&#xa0;nm. The average particle size of the Ag-rGO nanocomposites has been obtained from FESEM and TEM and found to be 33&#xa0;nm and 31&#xa0;nm, respectively. The zeta potential measurement revealed a value of approximately − 25.1&#xa0;mV, indicating good colloidal stability. Fourier transform infrared (FTIR) spectra further confirm the reduction of GO and successful incorporation of Ag NPs. Significant enhancement of defect density and effective nanoparticles decoration is revealed from the Raman spectra with distinct D and G bands and demonstrated the increase of I<sub>D</sub>/I<sub>G</sub> ratio from 1.08 (rGO) to 1.20 (Ag-rGO). UV–Vis absorption spectra suggest a direct band gap tuning of rGO due to the incorporation of Ag NPs, favoring visible-light absorption. The performance of photocatalytic activities of Ag-rGO nanocomposite has been studied and found to be enhanced than pure rGO for Methylene Blue (MB) and Alizarin Cyanine Green (ACG) dyes under sunlight irradiation for 120&#xa0;min. The distribution effect of Ag nanoparticles on rGO sheets generates number of defects in this nanocomposite material. The obtained result reveals that the life time of the carriers is increased due to defect states and thereby recombination is delayed as well as photocatalytic activity is enhanced.</p>

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Enhanced photocatalytic degradation of organic dyes through Ag-nanoparticle-decorated rGO sheets

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Mihir Ranjan Bera,
  • Tilak Narayan Ghosh,
  • Rajkumar Singha,
  • Makhanlal Nanda Goswami

摘要

Successful synthesis of a silver-decorated reduced graphene oxide (Ag-rGO) nanocomposite and its efficient photocatalytic activity toward dye degradation under sunlight irradiation is reported here. X-ray diffraction (XRD) analysis of this nanocomposite confirms the crystalline nature of Ag NPs on rGO sheets with an estimated crystallite size of the composite around 45 nm. The average particle size of the Ag-rGO nanocomposites has been obtained from FESEM and TEM and found to be 33 nm and 31 nm, respectively. The zeta potential measurement revealed a value of approximately − 25.1 mV, indicating good colloidal stability. Fourier transform infrared (FTIR) spectra further confirm the reduction of GO and successful incorporation of Ag NPs. Significant enhancement of defect density and effective nanoparticles decoration is revealed from the Raman spectra with distinct D and G bands and demonstrated the increase of ID/IG ratio from 1.08 (rGO) to 1.20 (Ag-rGO). UV–Vis absorption spectra suggest a direct band gap tuning of rGO due to the incorporation of Ag NPs, favoring visible-light absorption. The performance of photocatalytic activities of Ag-rGO nanocomposite has been studied and found to be enhanced than pure rGO for Methylene Blue (MB) and Alizarin Cyanine Green (ACG) dyes under sunlight irradiation for 120 min. The distribution effect of Ag nanoparticles on rGO sheets generates number of defects in this nanocomposite material. The obtained result reveals that the life time of the carriers is increased due to defect states and thereby recombination is delayed as well as photocatalytic activity is enhanced.