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<p>This study investigates the development of a graphitic carbon nitride/niobium pentoxide/bismuth oxide (GCN/Nb<sub>2</sub>O<sub>5</sub>/Bi<sub>2</sub>O<sub>3</sub>) ternary composite photocatalyst for enhanced methylene blue (MB) degradation under visible light irradiation. The g-C₃N₄ (GCN) was synthesized using a simple thermal method, and the ternary nanocomposite was prepared via a mechanochemical route. The GCN/Nb<sub>2</sub>O<sub>5</sub>/Bi<sub>2</sub>O<sub>3</sub> ternary composite exhibited superior photocatalytic activity compared to pristine GCN and GCN-based binary composites, achieving 98% MB degradation within 105&#xa0;min under visible light irradiation. The combined action of GCN, Nb₂O₅, and Bi₂O₃ synergistically enhances performance by effectively separating charges and minimizing the recombination of photogenerated electron-hole pairs. Scavenger experiments showed that holes (h⁺) and hydroxyl radicals (•OH) play the primary roles in MB degradation. The GCN/Nb<sub>2</sub>O<sub>5</sub>/Bi<sub>2</sub>O<sub>3</sub> ternary composite demonstrated good stability, maintaining its photocatalytic activity over five consecutive reaction cycles. This work highlights the potential of GCN/Nb<sub>2</sub>O<sub>5</sub>/Bi<sub>2</sub>O<sub>3</sub> ternary composite for efficient wastewater treatment applications.</p>

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Mechanochemical Synthesis of GCN/Nb2O5/Bi2O3Ternary Composite Photocatalyst for Enhanced Visible Light Driven Degradation of Organic Pollutants

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • K. Shanthini,
  • V. Manivannan

摘要

This study investigates the development of a graphitic carbon nitride/niobium pentoxide/bismuth oxide (GCN/Nb2O5/Bi2O3) ternary composite photocatalyst for enhanced methylene blue (MB) degradation under visible light irradiation. The g-C₃N₄ (GCN) was synthesized using a simple thermal method, and the ternary nanocomposite was prepared via a mechanochemical route. The GCN/Nb2O5/Bi2O3 ternary composite exhibited superior photocatalytic activity compared to pristine GCN and GCN-based binary composites, achieving 98% MB degradation within 105 min under visible light irradiation. The combined action of GCN, Nb₂O₅, and Bi₂O₃ synergistically enhances performance by effectively separating charges and minimizing the recombination of photogenerated electron-hole pairs. Scavenger experiments showed that holes (h⁺) and hydroxyl radicals (•OH) play the primary roles in MB degradation. The GCN/Nb2O5/Bi2O3 ternary composite demonstrated good stability, maintaining its photocatalytic activity over five consecutive reaction cycles. This work highlights the potential of GCN/Nb2O5/Bi2O3 ternary composite for efficient wastewater treatment applications.