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<p>Copper vanadate nanomaterials have attracted widespread attention as promising photocatalysts for the degradation of organic pollutants due to their narrow bandgap and efficient visible light absorption ability. In this study, copper vanadate nanosheets Cu<sub>3</sub>V<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·2H<sub>2</sub>O were synthesized using a simple precipitation method and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. The photocatalytic performance of Cu<sub>3</sub>V<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·2H<sub>2</sub>O prepared under different pH conditions was evaluated through methylene blue degradation experiments using a xenon lamp under simulated solar-light irradiation. Results showed that Cu<sub>3</sub>V<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·2H<sub>2</sub>O nanomaterials at pH = 12 exhibited high photocatalytic activity, achieving an MB degradation rate of 81%, with an apparent rate constant of 0.0140&#xa0;min<sup>−1</sup>, demonstrating their potential in wastewater treatment applications. Electrochemical impedance spectroscopy and zeta-potential analyses showed that the pH = 12 sample possessed improved interfacial charge-transfer behavior and favorable surface charge characteristics. Catalyst-dosage and MB-concentration gradient experiments identified 50&#xa0;mg as the optimum catalyst dosage, while higher initial MB concentration reduced the degradation efficiency. After five successive cycles, the degradation efficiency decreased by only 9%, indicating good reusability and cycling stability. To further investigate the&#xa0;photocatalytic mechanism, various free radical scavengers were employed to identify the key reactive species involved in the degradation process. Hydroxyl radicals (·OH) and photogenerated holes (h<sup>+</sup>) played a crucial role in the degradation of methylene blue. Kinetic analysis of the photocatalytic reaction indicated that the degradation of methylene blue followed a&#xa0;pseudo-first-order kinetic model. These results indicate that Cu<sub>3</sub>V<sub>2</sub>O<sub>7</sub>(OH)<sub>2</sub>·2H<sub>2</sub>O can serve as an efficient and environmentally friendly photocatalyst for organic pollutant degradation, providing a promising strategy for wastewater treatment.</p>

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pH-Regulated precipitation synthesis of copper vanadate nanomaterials for enhanced photocatalytic degradation

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Yanan Zhang,
  • Junhe Zhang,
  • Zhehao Cui,
  • Yiming Gao,
  • Yong Zhang,
  • Lizhai Pei

摘要

Copper vanadate nanomaterials have attracted widespread attention as promising photocatalysts for the degradation of organic pollutants due to their narrow bandgap and efficient visible light absorption ability. In this study, copper vanadate nanosheets Cu3V2O7(OH)2·2H2O were synthesized using a simple precipitation method and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy. The photocatalytic performance of Cu3V2O7(OH)2·2H2O prepared under different pH conditions was evaluated through methylene blue degradation experiments using a xenon lamp under simulated solar-light irradiation. Results showed that Cu3V2O7(OH)2·2H2O nanomaterials at pH = 12 exhibited high photocatalytic activity, achieving an MB degradation rate of 81%, with an apparent rate constant of 0.0140 min−1, demonstrating their potential in wastewater treatment applications. Electrochemical impedance spectroscopy and zeta-potential analyses showed that the pH = 12 sample possessed improved interfacial charge-transfer behavior and favorable surface charge characteristics. Catalyst-dosage and MB-concentration gradient experiments identified 50 mg as the optimum catalyst dosage, while higher initial MB concentration reduced the degradation efficiency. After five successive cycles, the degradation efficiency decreased by only 9%, indicating good reusability and cycling stability. To further investigate the photocatalytic mechanism, various free radical scavengers were employed to identify the key reactive species involved in the degradation process. Hydroxyl radicals (·OH) and photogenerated holes (h+) played a crucial role in the degradation of methylene blue. Kinetic analysis of the photocatalytic reaction indicated that the degradation of methylene blue followed a pseudo-first-order kinetic model. These results indicate that Cu3V2O7(OH)2·2H2O can serve as an efficient and environmentally friendly photocatalyst for organic pollutant degradation, providing a promising strategy for wastewater treatment.