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<p>In this study, g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites were successfully synthesized by coprecipitation and thermal pyrolysis methods to evaluate their photocatalytic and antibacterial activities. The synthesized nanocomposites were comprehensively analyzed through X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy and photoluminescence techniques to evaluate their structural, chemical, morphological and optical properties. X-ray diffraction confirmed the successful incorporation of Zn-doped CuO and g-C<sub>3</sub>N<sub>4</sub>. The morphology showed a well-dispersed hybrid structure in which the components are in close interfacial contact. UV-Vis diffuse reflectance spectroscopy revealed a red shift and a narrow band gap in the g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites compared to pure g-C<sub>3</sub>N<sub>4</sub> and CuO, which significantly enhanced the light absorption ability. Photoluminescence analysis revealed the suppressed electron-hole pair recombination in the g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites. The g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites exhibited excellent photocatalytic performance, achieving up to 88.47% degradation of Rose Bengal dye within 120 min. Furthermore, g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites exhibited significant antibacterial efficacy with larger zones of inhibition against <i>Klebsiella pneumoniae</i> (9 ± 0.41 mm) compared to <i>Staphylococcus aureus</i> (8 ± 0.52 mm) at a concentration of 100 μg.mL<sup>-1</sup>. The enhanced performance can be attributed to the synergistic interaction between g-C<sub>3</sub>N<sub>4</sub> and Zn-doped CuO, which improves the charge separation efficiency and also enhances the photocatalytic performance. This work highlights the potential of g-C<sub>3</sub>N<sub>4</sub>/Zn-doped CuO nanocomposites as efficient and sustainable materials for environmental and biomedical applications.</p>

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Investigation of g-C3N4/Zn-CuO Nanocomposite for the Photocatalytic Efficiency of Rose Bengal and its Antibacterial Properties

  • 期刊论文

  • 发表日期：

    2025年7月29日

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  • Elavarasan Nagaraj,
  • Ranjith Rajendran,
  • Orawan Rojviroon,
  • Natacha Phetyim,
  • Raguvaran Krishnan,
  • Pazhanivel Thangavelu,
  • Thammasak Rojviroon

摘要

In this study, g-C3N4/Zn-doped CuO nanocomposites were successfully synthesized by coprecipitation and thermal pyrolysis methods to evaluate their photocatalytic and antibacterial activities. The synthesized nanocomposites were comprehensively analyzed through X-ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis diffuse reflectance spectroscopy and photoluminescence techniques to evaluate their structural, chemical, morphological and optical properties. X-ray diffraction confirmed the successful incorporation of Zn-doped CuO and g-C3N4. The morphology showed a well-dispersed hybrid structure in which the components are in close interfacial contact. UV-Vis diffuse reflectance spectroscopy revealed a red shift and a narrow band gap in the g-C3N4/Zn-doped CuO nanocomposites compared to pure g-C3N4 and CuO, which significantly enhanced the light absorption ability. Photoluminescence analysis revealed the suppressed electron-hole pair recombination in the g-C3N4/Zn-doped CuO nanocomposites. The g-C3N4/Zn-doped CuO nanocomposites exhibited excellent photocatalytic performance, achieving up to 88.47% degradation of Rose Bengal dye within 120 min. Furthermore, g-C3N4/Zn-doped CuO nanocomposites exhibited significant antibacterial efficacy with larger zones of inhibition against Klebsiella pneumoniae (9 ± 0.41 mm) compared to Staphylococcus aureus (8 ± 0.52 mm) at a concentration of 100 μg.mL-1. The enhanced performance can be attributed to the synergistic interaction between g-C3N4 and Zn-doped CuO, which improves the charge separation efficiency and also enhances the photocatalytic performance. This work highlights the potential of g-C3N4/Zn-doped CuO nanocomposites as efficient and sustainable materials for environmental and biomedical applications.