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<p>Photocatalytic organic pollutant degradation offers new perspectives for sustainable sunlight utilization and wastewater purification. In this study, the flower-like Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> (BOC) nanosheets were incorporated into zirconium-based MOFs (MOF-801) for the construction of BOC@MOF-801 heterojunction nanocomposites, through a simple one-pot hydrothermal route to remove persistent rhodamine B (RhB) dye efficiently. The as-synthesized photocatalysts were systematically characterized by XRD, FTIR, SEM, EDS, N<sub>2</sub> physisorption, TG, XPS, UV-Vis DRS, PL, transient photocurrent, and EIS techniques. The results of all characterization studies confirmed that the incorporation of BOC into MOF-801 improved the textural properties, visible light response-ability, and the formation of heterojunctions with better charge transport. All BOC@MOF-801 photocatalysts show high activity, with the BOC@MOF-801-0.2 nanocomposite reaching 98.8% RhB (50&#xa0;mg/L) degradation after 120&#xa0;min under visible radiation, superior to individual BOC and MOF-801. This improvement possibly due to the relatively high specific surface area (316.2 m<sup>2</sup>/g), suitable pore volume (0.17 cm<sup>3</sup>/g), mesoscale pore size (3.2&#xa0;nm), narrowed band gap (3.22&#xa0;eV), and higher photocurrent. Importantly, the free radical scavenging experiment exhibited that holes and <sup><b>·</b></sup>O<sub>2</sub><sup>−</sup> radicals are the main species responsible during photodegradation. Moreover, a potential mechanism for the breakdown of RhB dye is also discussed. This research highlighted an efficient way to develop MOFs-based heterojunction hybrid materials for environmental remediation applications.</p> Graphical Abstract <p>Zirconium-based MOFs (MOF-801) supported Bi<sub>2</sub>O<sub>2</sub>CO<sub>3</sub> nanocomposites (BOC@MOF-801) were successfully synthesized <i>via</i> a simple one-pot hydrothermal route, which was subsequently applied to photocatalytic degradation of organic dye.</p>

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Facile Fabrication of Bi2O2CO3/MOF-801 Nanocomposites for Efficient Photodegradation of Noxious RhB Pollutants

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Qiuyun Zhang,
  • Maozhen He,
  • Shijian He,
  • Yanhui Lei,
  • Huixin Zou,
  • Xiaojuan Zhang,
  • Yulin Hu,
  • Yutao Zhang

摘要

Photocatalytic organic pollutant degradation offers new perspectives for sustainable sunlight utilization and wastewater purification. In this study, the flower-like Bi2O2CO3 (BOC) nanosheets were incorporated into zirconium-based MOFs (MOF-801) for the construction of BOC@MOF-801 heterojunction nanocomposites, through a simple one-pot hydrothermal route to remove persistent rhodamine B (RhB) dye efficiently. The as-synthesized photocatalysts were systematically characterized by XRD, FTIR, SEM, EDS, N2 physisorption, TG, XPS, UV-Vis DRS, PL, transient photocurrent, and EIS techniques. The results of all characterization studies confirmed that the incorporation of BOC into MOF-801 improved the textural properties, visible light response-ability, and the formation of heterojunctions with better charge transport. All BOC@MOF-801 photocatalysts show high activity, with the BOC@MOF-801-0.2 nanocomposite reaching 98.8% RhB (50 mg/L) degradation after 120 min under visible radiation, superior to individual BOC and MOF-801. This improvement possibly due to the relatively high specific surface area (316.2 m2/g), suitable pore volume (0.17 cm3/g), mesoscale pore size (3.2 nm), narrowed band gap (3.22 eV), and higher photocurrent. Importantly, the free radical scavenging experiment exhibited that holes and ·O2− radicals are the main species responsible during photodegradation. Moreover, a potential mechanism for the breakdown of RhB dye is also discussed. This research highlighted an efficient way to develop MOFs-based heterojunction hybrid materials for environmental remediation applications.

Graphical Abstract

Zirconium-based MOFs (MOF-801) supported Bi2O2CO3 nanocomposites (BOC@MOF-801) were successfully synthesized via a simple one-pot hydrothermal route, which was subsequently applied to photocatalytic degradation of organic dye.