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<p>In this study, in situ-synthesized ZnO/g-C<sub>3</sub>N<sub>4</sub> based composites were used as photocatalysts for organic pollution removal. These nanocomposites were prepared through simple calcination of a mixture of melamine and ZnO nanoparticles and underwent comprehensive evaluation of their structural, morphological, optical, and photocatalytic properties, using various analytical techniques. As the g-C<sub>3</sub>N<sub>4</sub> content increased, the band gap decreased from 3.02 to 2.94&#xa0;eV. Additionally, the reduction in photoluminescence intensity confirmed the heterojunction interface between the g-C<sub>3</sub>N<sub>4</sub> and ZnO components. The photodegradation rate of methylene blue (MB) dye exhibited an increase, rising from 0.016 (min<sup>−1</sup>) for ZnO and 0.011 (min<sup>−1</sup>) for g-C<sub>3</sub>N<sub>4</sub> to 0.022 (min<sup>−1</sup>) for the ZnO/g-C<sub>3</sub>N<sub>4</sub> (10 wt%) composite. Furthermore, combining ZnO (50 wt%) with g-C<sub>3</sub>N<sub>4</sub> led to a significant enhancement in the MB dye removal efficiency, reaching 97% compared to the ZnO/g-C<sub>3</sub>N<sub>4</sub> (10 wt%) composite. In contrast, the removal efficiencies were 90% for pristine ZnO and 73% for g-C<sub>3</sub>N<sub>4</sub> phases.</p>

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In situ synthesis of ZnO/g-C3N4 based composites for photodegradation of methylene blue under visible light

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月2日

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  • S. Pourali,
  • R. Amrollahi,
  • S. Alamolhoda,
  • S. M. Masoudpanah

摘要

In this study, in situ-synthesized ZnO/g-C3N4 based composites were used as photocatalysts for organic pollution removal. These nanocomposites were prepared through simple calcination of a mixture of melamine and ZnO nanoparticles and underwent comprehensive evaluation of their structural, morphological, optical, and photocatalytic properties, using various analytical techniques. As the g-C3N4 content increased, the band gap decreased from 3.02 to 2.94 eV. Additionally, the reduction in photoluminescence intensity confirmed the heterojunction interface between the g-C3N4 and ZnO components. The photodegradation rate of methylene blue (MB) dye exhibited an increase, rising from 0.016 (min−1) for ZnO and 0.011 (min−1) for g-C3N4 to 0.022 (min−1) for the ZnO/g-C3N4 (10 wt%) composite. Furthermore, combining ZnO (50 wt%) with g-C3N4 led to a significant enhancement in the MB dye removal efficiency, reaching 97% compared to the ZnO/g-C3N4 (10 wt%) composite. In contrast, the removal efficiencies were 90% for pristine ZnO and 73% for g-C3N4 phases.