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<p>Graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) has emerged as a promising photocatalyst for visible-light-driven applications due to its suitable band structure. However, the rapid recombination of photogenerated electron-hole pairs in bulk g-C<sub>3</sub>N<sub>4</sub> significantly hinders its photocatalytic efficiency. In this study, we report the fabrication of a ternary g-C<sub>3</sub>N<sub>4</sub>/MoS<sub>2</sub>/rGO (CMG) nanocomposite via in situ photoreduction-induced exfoliation. The introduction of MoS<sub>2</sub> and rGO not only facilitates the exfoliation of g-C<sub>3</sub>N<sub>4</sub> into ultrathin nanosheet, thereby exposing more active sites, but also enables the formation of tightly coupled heterojunctions that promote charge separation and transfer. Photoluminescence (PL) analyses confirm the suppressed recombination of charge carriers, indicative of enhanced charge dynamics within the heterojunction between MoS<sub>2</sub>, rGO and g-C<sub>3</sub>N<sub>4</sub>. Among the synthesized materials, the optimized CMG-175 composite exhibits remarkable photocatalytic activity, achieving a 95.7% degradation rate of Rhodamine B (RhB) within 30&#xa0;min under visible light irradiation, which is 23.6-fold enhancement compared to pristine g-C<sub>3</sub>N<sub>4</sub>. Mechanistic studies reveal that photogenerated holes and superoxide radicals are the predominant reactive species driving the degradation process. This work highlights a rational design strategy for constructing high-performance g-C<sub>3</sub>N<sub>4</sub>-based heterojunction photocatalysts and provides valuable insight into the synergistic interactions among MoS<sub>2</sub>, rGO, and g-C<sub>3</sub>N<sub>4</sub> for efficient organic pollutant removal.</p>

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Synergistic construction of g-C3N4/MoS2/rGO ternary nanocomposite for enhanced photocatalytic degradation under visible light

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月24日

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  • Ying Lei,
  • Qijing Bao,
  • Feng Lin,
  • Jian Zhang,
  • Yanji Zhang,
  • Yuechao Wu,
  • Liang Lv,
  • Liyong Ding

摘要

Graphite carbon nitride (g-C3N4) has emerged as a promising photocatalyst for visible-light-driven applications due to its suitable band structure. However, the rapid recombination of photogenerated electron-hole pairs in bulk g-C3N4 significantly hinders its photocatalytic efficiency. In this study, we report the fabrication of a ternary g-C3N4/MoS2/rGO (CMG) nanocomposite via in situ photoreduction-induced exfoliation. The introduction of MoS2 and rGO not only facilitates the exfoliation of g-C3N4 into ultrathin nanosheet, thereby exposing more active sites, but also enables the formation of tightly coupled heterojunctions that promote charge separation and transfer. Photoluminescence (PL) analyses confirm the suppressed recombination of charge carriers, indicative of enhanced charge dynamics within the heterojunction between MoS2, rGO and g-C3N4. Among the synthesized materials, the optimized CMG-175 composite exhibits remarkable photocatalytic activity, achieving a 95.7% degradation rate of Rhodamine B (RhB) within 30 min under visible light irradiation, which is 23.6-fold enhancement compared to pristine g-C3N4. Mechanistic studies reveal that photogenerated holes and superoxide radicals are the predominant reactive species driving the degradation process. This work highlights a rational design strategy for constructing high-performance g-C3N4-based heterojunction photocatalysts and provides valuable insight into the synergistic interactions among MoS2, rGO, and g-C3N4 for efficient organic pollutant removal.