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<p>Photocatalysts have offered a successful strategy for degrading organic pollutants, such as various dyes and antibiotics, in wastewater. In this study, the flower-like Bi<sub>2</sub>MoO<sub>6</sub> balls were impregnated on the zirconium-based MOFs (MOF-801) to construct the Bi<sub>2</sub>MoO<sub>6</sub>/MOF-801 heterojunction composite photocatalytic materials through a simple one-pot hydrothermal method. The systematically characterization of the as-synthesized composite materials was performed using various analytical techniques, including XRD, FTIR, SEM-EDS, N<sub>2</sub> adsorption⁃desorption testing, TG, XPS, UV-Vis DRS, PL, transient photocurrent, and EIS techniques, thereby confirming the successful impregnation of Bi<sub>2</sub>MoO<sub>6</sub> into MOF-801. The degradation effect of the Bi<sub>2</sub>MoO<sub>6</sub>/MOF-801 composites on rhodamine B (RhB) dye was investigated, along with the photocatalytic degradation mechanism. Results showed that 0.1-Bi<sub>2</sub>MoO<sub>6</sub>/MOF-801 has better degradation efficiency for RhB dye than that of pure Bi<sub>2</sub>MoO<sub>6</sub> and MOF-801 under visible light conditions, with a complete degradation efficiency of 98.1% achieved within 40&#xa0;min. The boosted photocatalytic performance of the 0.1-Bi<sub>2</sub>MoO<sub>6</sub>/MOF-801 composite is attributed to their high specific surface area (529.2 m<sup>2</sup>/g) and mesoscale pore size (6.9&#xa0;nm), wide visible spectral absorption, well-optimized band gap (2.81&#xa0;eV), and the close contact of Bi<sub>2</sub>MoO<sub>6</sub> and MOF-801 ensuring efficient charge separation and suppressing the recombination of photogenerated electron-hole pairs. Visible-light driven photocatalysis of 0.1-Bi<sub>2</sub>MoO<sub>6</sub>/MOF-801 composite further confirmed superior degradation of MB, AO, CR, MO, and ARS dyes, reaching degradation efficiencies up to 99.7%. Moreover, the results of the free radical capture experiments confirmed that the holes (<i>h</i><sup>+</sup>) and superoxide radicals (•O<sub>2</sub><sup>−</sup>), and electrons (<i>e</i><sup>−</sup>) were the primary active substances during the degradation process, supporting the Z-scheme heterojunction charge transfer mechanism. This research study will point the direction for designing potential and affordable MOF-based heterojunction materials for the treatment of dye-contaminated wastewater.</p> Graphical Abstract <p></p>

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Efficient photocatalytic degradation of organic dyes using Bi2MoO6/MOF-801 heterojunction nanocomposite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Qiuyun Zhang,
  • Shijian He,
  • Siyu Hu,
  • Huixin Zou,
  • Maozhen He,
  • Tingting Zhang,
  • Taoli Deng,
  • Jingsong Cheng,
  • Yutao Zhang

摘要

Photocatalysts have offered a successful strategy for degrading organic pollutants, such as various dyes and antibiotics, in wastewater. In this study, the flower-like Bi2MoO6 balls were impregnated on the zirconium-based MOFs (MOF-801) to construct the Bi2MoO6/MOF-801 heterojunction composite photocatalytic materials through a simple one-pot hydrothermal method. The systematically characterization of the as-synthesized composite materials was performed using various analytical techniques, including XRD, FTIR, SEM-EDS, N2 adsorption⁃desorption testing, TG, XPS, UV-Vis DRS, PL, transient photocurrent, and EIS techniques, thereby confirming the successful impregnation of Bi2MoO6 into MOF-801. The degradation effect of the Bi2MoO6/MOF-801 composites on rhodamine B (RhB) dye was investigated, along with the photocatalytic degradation mechanism. Results showed that 0.1-Bi2MoO6/MOF-801 has better degradation efficiency for RhB dye than that of pure Bi2MoO6 and MOF-801 under visible light conditions, with a complete degradation efficiency of 98.1% achieved within 40 min. The boosted photocatalytic performance of the 0.1-Bi2MoO6/MOF-801 composite is attributed to their high specific surface area (529.2 m2/g) and mesoscale pore size (6.9 nm), wide visible spectral absorption, well-optimized band gap (2.81 eV), and the close contact of Bi2MoO6 and MOF-801 ensuring efficient charge separation and suppressing the recombination of photogenerated electron-hole pairs. Visible-light driven photocatalysis of 0.1-Bi2MoO6/MOF-801 composite further confirmed superior degradation of MB, AO, CR, MO, and ARS dyes, reaching degradation efficiencies up to 99.7%. Moreover, the results of the free radical capture experiments confirmed that the holes (h+) and superoxide radicals (•O2−), and electrons (e−) were the primary active substances during the degradation process, supporting the Z-scheme heterojunction charge transfer mechanism. This research study will point the direction for designing potential and affordable MOF-based heterojunction materials for the treatment of dye-contaminated wastewater.

Graphical Abstract