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<p>This research intends to improve the photocatalytic efficiency of graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) for visible-light–driven pollutant degradation by constructing a novel Cu<sub>3</sub>P/Zn<sub>0.8</sub>Cd<sub>0.2</sub>S/g-C<sub>3</sub>N<sub>4</sub> ternary nanocomposite. The synthesis of Cu<sub>3</sub>P/Zn<sub>0.8</sub>Cd<sub>0.2</sub>S/g-C<sub>3</sub>N<sub>4</sub>&#xa0;is conducted by a facile hydrothermal procedure. The structural characteristics, morphology, and photocatalytic properties of the composite were evaluated using XRD, FTIR, XPS, BET, FE-SEM, EDS, TEM, UV–Vis DRS, PL, EIS, photocurrent response, Mott-Schottky, and UV–Vis spectroscopy. The photocatalytic degradation of the aqueous solution of methylene blue was performed for 3 h under the irradiation of an LED lamp (100 W, 400–700 nm). The 5%-Cu<sub>3</sub>P/Zn<sub>0.8</sub>Cd<sub>0.2</sub>S/g-C<sub>3</sub>N<sub>4</sub> composite exhibited the highest photocatalytic efficiency, achieving a 95.64% degradation of MB within 180 min, and 72.09% in 30 min, with an apparent rate constant of 0.0131 min<sup>−1</sup>, substantially outperforming the individual components (58.55% for g-C<sub>3</sub>N<sub>4</sub>, 58.63% for Zn<sub>0.8</sub>Cd<sub>0.2</sub>S, and 70.15% for Cu<sub>3</sub>P within 180 min). The improved photocatalytic capability of Cu<sub>3</sub>P/Zn<sub>0.8</sub>Cd<sub>0.2</sub>S/g-C<sub>3</sub>N<sub>4</sub> is mainly attributed to the construction of a dual Z-scheme heterojunction between g-C<sub>3</sub>N<sub>4</sub>, Zn<sub>0.8</sub>Cd<sub>0.2</sub>S, and Cu<sub>3</sub>P, promoting both the separation and movement of photoexcited charge transporters. This study demonstrates the potential of developing Cu<sub>3</sub>P/Zn<sub>0.8</sub>Cd<sub>0.2</sub>S/g-C<sub>3</sub>N<sub>4</sub> heterojunction as a noble-metal-free and cost-effective photocatalyst for wastewater treatment, suggesting its applicability for other purposes such as water splitting, CO<sub>2</sub> reduction, and antibacterial activity.</p>

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Cu3P/Zn0.8Cd0.2S/g-C3N4 ternary nanocomposite for efficient visible-light-driven degradation of methylene blue through a dual Z-scheme photocatalytic configuration

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Mohamad Amin Ziveh,
  • Fatemeh Sousani,
  • Sayed Khatiboleslam Sadrnezhaad,
  • Mukul Sethi

摘要

This research intends to improve the photocatalytic efficiency of graphitic carbon nitride (g-C3N4) for visible-light–driven pollutant degradation by constructing a novel Cu3P/Zn0.8Cd0.2S/g-C3N4 ternary nanocomposite. The synthesis of Cu3P/Zn0.8Cd0.2S/g-C3N4 is conducted by a facile hydrothermal procedure. The structural characteristics, morphology, and photocatalytic properties of the composite were evaluated using XRD, FTIR, XPS, BET, FE-SEM, EDS, TEM, UV–Vis DRS, PL, EIS, photocurrent response, Mott-Schottky, and UV–Vis spectroscopy. The photocatalytic degradation of the aqueous solution of methylene blue was performed for 3 h under the irradiation of an LED lamp (100 W, 400–700 nm). The 5%-Cu3P/Zn0.8Cd0.2S/g-C3N4 composite exhibited the highest photocatalytic efficiency, achieving a 95.64% degradation of MB within 180 min, and 72.09% in 30 min, with an apparent rate constant of 0.0131 min−1, substantially outperforming the individual components (58.55% for g-C3N4, 58.63% for Zn0.8Cd0.2S, and 70.15% for Cu3P within 180 min). The improved photocatalytic capability of Cu3P/Zn0.8Cd0.2S/g-C3N4 is mainly attributed to the construction of a dual Z-scheme heterojunction between g-C3N4, Zn0.8Cd0.2S, and Cu3P, promoting both the separation and movement of photoexcited charge transporters. This study demonstrates the potential of developing Cu3P/Zn0.8Cd0.2S/g-C3N4 heterojunction as a noble-metal-free and cost-effective photocatalyst for wastewater treatment, suggesting its applicability for other purposes such as water splitting, CO2 reduction, and antibacterial activity.