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<p>The increasing discharge of dye-containing wastewater from the textile industry has become a serious environmental concern due to its persistence and toxicity. In this study, the gold-dot (Au-dot) was decorated on selenium-doped graphitic carbon nitride (SeCN) through a simple impregnation method to develop the AuSeCN composites. The structure, composition, and electronic properties were characterized by FTIR, XRD, FE-SEM, EDX, XPS, UV–Vis, HR-TEM, M-S, and EIS, confirming the successful incorporation of selenium and Au without altering the CN framework. Under the suitable conditions (20&#xa0;mg catalyst and pH 5.5), the 5% Au-decorated SeCN (5AuSeCN) sample achieved 90.63% methylene blue degradation after 80&#xa0;min and retained over 60% activity after four cycles. Radical quenching revealed ⋅O<sub>2</sub><sup>−</sup> and e<sup>−</sup> as the dominant reactive species. The synergistic interaction between Se doping and plasmonic Au enhances charge separation, resulting in improved photocatalytic performance. In addition, the presence of coexisting ions and real water matrices slightly reduced degradation efficiency, reflecting the influence of competing species under more complex conditions.</p>

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Simple and low-cost efficiency synthesis of gold-dot decorated on selenium-doped graphitic carbon nitride composites for photodegradation of methylene blue

  • 期刊论文

  • 发表日期：

    2026年6月24日

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  • Tran Dang Khoa,
  • Dang Thanh Cong Minh,
  • Tran Nguyen Cam Nhung,
  • Tong Thanh Danh,
  • Nguyen Huu Hieu

摘要

The increasing discharge of dye-containing wastewater from the textile industry has become a serious environmental concern due to its persistence and toxicity. In this study, the gold-dot (Au-dot) was decorated on selenium-doped graphitic carbon nitride (SeCN) through a simple impregnation method to develop the AuSeCN composites. The structure, composition, and electronic properties were characterized by FTIR, XRD, FE-SEM, EDX, XPS, UV–Vis, HR-TEM, M-S, and EIS, confirming the successful incorporation of selenium and Au without altering the CN framework. Under the suitable conditions (20 mg catalyst and pH 5.5), the 5% Au-decorated SeCN (5AuSeCN) sample achieved 90.63% methylene blue degradation after 80 min and retained over 60% activity after four cycles. Radical quenching revealed ⋅O2− and e− as the dominant reactive species. The synergistic interaction between Se doping and plasmonic Au enhances charge separation, resulting in improved photocatalytic performance. In addition, the presence of coexisting ions and real water matrices slightly reduced degradation efficiency, reflecting the influence of competing species under more complex conditions.