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<p>rGO/ V<sub>2</sub>O<sub>5</sub> nanowire composites were synthesized via a green hydrothermal process, and the effect of hydrothermal duration on their morphology and photocatalytic performance was systematically evaluated. The composite prepared at 36&#xa0;h exhibited the most uniform nanowire architecture and the strongest interfacial coupling. Under simulated solar irradiation, this sample achieved 95.5% degradation of methylene blue (20&#xa0;mg/L) within 240&#xa0;min, significantly outperforming pristine V<sub>2</sub>O<sub>5</sub>. Radical-trapping experiments confirmed that superoxide radicals (O<sub>2</sub><sup>•−</sup>) and photogenerated holes (h⁺) are the primary active species, whereas hydroxyl radicals (•OH) contribute marginally. A mechanism is proposed in which photoexcited electrons transfer from V<sub>2</sub>O<sub>5</sub> to rGO, where rGO acts as an electron sink that suppresses electron–hole recombination and promotes O<sub>2</sub> reduction to O<sub>2</sub><sup>•−</sup>,thereby accelerating pollutant degradation into CO<sub>2</sub>, H<sub>2</sub>O, and inorganic ions. These results demonstrate the synergistic effect of rGO–V₂O₅ coupling and highlight a sustainable strategy for developing efficient photocatalysts for environmental remediation.</p>

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Eco-friendly hydrothermal fabrication of rGO/V2O5 nanowires for enhanced solar photocatalysis

  • 期刊论文

  • 发表日期：

    2026年1月30日

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  • Lan Phuong Vo Thi,
  • Quang Dat Do,
  • Van Manh Tien,
  • Thuy Duong Ngo,
  • Quan-Doan Mai,
  • Duy Van Lai,
  • Matteo Tonezzer,
  • Van Nang Lam,
  • Van Huong Nguyen,
  • Duong Duc La

摘要

rGO/ V2O5 nanowire composites were synthesized via a green hydrothermal process, and the effect of hydrothermal duration on their morphology and photocatalytic performance was systematically evaluated. The composite prepared at 36 h exhibited the most uniform nanowire architecture and the strongest interfacial coupling. Under simulated solar irradiation, this sample achieved 95.5% degradation of methylene blue (20 mg/L) within 240 min, significantly outperforming pristine V2O5. Radical-trapping experiments confirmed that superoxide radicals (O2•−) and photogenerated holes (h⁺) are the primary active species, whereas hydroxyl radicals (•OH) contribute marginally. A mechanism is proposed in which photoexcited electrons transfer from V2O5 to rGO, where rGO acts as an electron sink that suppresses electron–hole recombination and promotes O2 reduction to O2•−,thereby accelerating pollutant degradation into CO2, H2O, and inorganic ions. These results demonstrate the synergistic effect of rGO–V₂O₅ coupling and highlight a sustainable strategy for developing efficient photocatalysts for environmental remediation.