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<p>The integration of graphene’s exceptional properties with the unique characteristics of metal oxide nanomaterials presents a promising approach for developing multifunctional materials. In this study rGO/Ag-CeO<sub>2</sub> nanocomposites (RAC NCs) were successfully synthesized via a polar solvent deposition method at room temperature. Comprehensive characterization was performed using XRD, FTIR, SEM, TEM, PL, BET, UV-DRS and XPS to evaluate the structural, morphological, optical and chemical properties of the synthesized composites. XRD confirmed the crystalline structure of RAC NCs, while FTIR revealed the presence of key molecular bonds. SEM and TEM analyses demonstrated well dispersed nanoparticles embedded within rGO layers with an average particle size of approximately 12&#xa0;nm. UV-DRS analysis showed a reduction in band gap energy to 2.98&#xa0;eV indicating enhanced visible light absorption. The specific surface area and total pore volume determined by BET analysis were 36.24 m<sup>2</sup>/g and 0.0998 cm<sup>3</sup>/g respectively. XPS further confirmed the successful formation of the composite and the presence of desired oxidation states. Photocatalytic experiments revealed a significantly enhanced degradation efficiency of 93.44% for methylene blue (MB) dye under natural sunlight, compared to only 25% degradation by pure CeO<sub>2</sub>. This improvement is attributed to efficient separation of photogenerated electron hole pairs <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{(e}^{-}/{h}^{+})\)</EquationSource> </InlineEquation> and increased surface adsorption due to the presence of rGO. Additionally the antibacterial activity of RAC NCs was assessed using the agar well diffusion method against <i>Escherichia coli</i>,<i> Pseudomonas aeruginosa</i>, and <i>Staphylococcus aureus</i>. The nanocomposites exhibited substantial antibacterial effects with inhibition zones of 14.90, 11.89 and 9.83&#xa0;mm respectively. These findings demonstrate the potential of RAC NCs as efficient photocatalysts and antibacterial agents for environmental remediation applications.</p> Graphical Abstract <p>Graphical representation of photocatalytic pathway of RAC NCs.</p>

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Inorganic-Carbon Nanohybrid rGO/Ag-CeO2 Nanocomposites with Structural Insights and Dual Photocatalytic-Antibacterial Properties

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Karuppannan Alaguvel,
  • Velumani Arun,
  • Yosephin Dewiani Rahmayanti,
  • Murni Handayani,
  • Subramanian Parvathy,
  • Paranthaman Vijayakumar,
  • Chandrasekaran Dhanush,
  • Kaliyappan Sivaranjani,
  • Santhanam Sivakumar

摘要

The integration of graphene’s exceptional properties with the unique characteristics of metal oxide nanomaterials presents a promising approach for developing multifunctional materials. In this study rGO/Ag-CeO2 nanocomposites (RAC NCs) were successfully synthesized via a polar solvent deposition method at room temperature. Comprehensive characterization was performed using XRD, FTIR, SEM, TEM, PL, BET, UV-DRS and XPS to evaluate the structural, morphological, optical and chemical properties of the synthesized composites. XRD confirmed the crystalline structure of RAC NCs, while FTIR revealed the presence of key molecular bonds. SEM and TEM analyses demonstrated well dispersed nanoparticles embedded within rGO layers with an average particle size of approximately 12 nm. UV-DRS analysis showed a reduction in band gap energy to 2.98 eV indicating enhanced visible light absorption. The specific surface area and total pore volume determined by BET analysis were 36.24 m2/g and 0.0998 cm3/g respectively. XPS further confirmed the successful formation of the composite and the presence of desired oxidation states. Photocatalytic experiments revealed a significantly enhanced degradation efficiency of 93.44% for methylene blue (MB) dye under natural sunlight, compared to only 25% degradation by pure CeO2. This improvement is attributed to efficient separation of photogenerated electron hole pairs \(\:{(e}^{-}/{h}^{+})\) and increased surface adsorption due to the presence of rGO. Additionally the antibacterial activity of RAC NCs was assessed using the agar well diffusion method against Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus. The nanocomposites exhibited substantial antibacterial effects with inhibition zones of 14.90, 11.89 and 9.83 mm respectively. These findings demonstrate the potential of RAC NCs as efficient photocatalysts and antibacterial agents for environmental remediation applications.

Graphical Abstract

Graphical representation of photocatalytic pathway of RAC NCs.