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<p>The photocatalytic technology is a green and energy-saving solution for environmental contamination. However, the efficient recovery of photocatalysts is a critical challenge in practical applications, especially for nano-photocatalysts. In this work, a novel hierarchical core–shell BiOBr/CaCO<sub>3</sub> photocatalyst was synthesized via a simple two-step approach. Cubic CaCO<sub>3</sub> was first obtained through a precipitation method. Subsequently, BiOBr nanosheets were grown on the CaCO<sub>3</sub> core via a solvothermal reaction. The core–shell BiOBr/CaCO<sub>3</sub> nanostructure demonstrated significantly enhanced photocatalytic performance compared to pristine BiOBr. 92.9% of Rhodamine B (RhB) was degraded by the core–shell BiOBr/CaCO<sub>3</sub> after visible-light irradiation for 80&#xa0;min and its reaction rate was 2.4 times that of pristine BiOBr. This enhancement was attributed to the following synergistic effects: the increased BET surface area provided more active sites; the enhanced adsorption capability of RhB improved degradation efficiency; and the broadened visible-light absorption range promoted the generation of charge carriers. Furthermore, the core–shell BiOBr/CaCO<sub>3</sub> nanostructure could be easily separated from the reaction systems by gravity sedimentation, which is very meaningful for the environmental treatment.</p>

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Preparation of hierarchical core–shell BiOBr/CaCO3 with visible-light photocatalytic activity

  • 期刊论文

  • 发表日期：

    2025年6月29日

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  • Jinghong Li,
  • Shuyi Mo,
  • Mengxue Zhao,
  • Yaxin Huang,
  • Jinyun He,
  • Bing Zhou,
  • Fei Long

摘要

The photocatalytic technology is a green and energy-saving solution for environmental contamination. However, the efficient recovery of photocatalysts is a critical challenge in practical applications, especially for nano-photocatalysts. In this work, a novel hierarchical core–shell BiOBr/CaCO3 photocatalyst was synthesized via a simple two-step approach. Cubic CaCO3 was first obtained through a precipitation method. Subsequently, BiOBr nanosheets were grown on the CaCO3 core via a solvothermal reaction. The core–shell BiOBr/CaCO3 nanostructure demonstrated significantly enhanced photocatalytic performance compared to pristine BiOBr. 92.9% of Rhodamine B (RhB) was degraded by the core–shell BiOBr/CaCO3 after visible-light irradiation for 80 min and its reaction rate was 2.4 times that of pristine BiOBr. This enhancement was attributed to the following synergistic effects: the increased BET surface area provided more active sites; the enhanced adsorption capability of RhB improved degradation efficiency; and the broadened visible-light absorption range promoted the generation of charge carriers. Furthermore, the core–shell BiOBr/CaCO3 nanostructure could be easily separated from the reaction systems by gravity sedimentation, which is very meaningful for the environmental treatment.