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<p>Developing efficient and stable visible-light-driven photocatalysts for the elimination of organic pollutants in aquatic environments remains a prominent research focus. In this study, a novel Mg-BiOCl/Bi-MOF heterojunction composite was successfully fabricated via a facile one-step solvothermal strategy. Herein, a bismuth-based metal-organic framework served as the structural template, while magnesium chloride was introduced as both a precursor and a regulating agent. Comprehensive characterizations reveal the in situ growth of Mg-BiOCl nanosheets on the Bi-MOF matrix, establishing a tight interfacial contact and a unique hierarchical porous architecture. This specific structural design significantly expands the specific surface area, thereby providing abundant catalytic active sites and facilitating efficient mass transfer channels for reactants. Under visible light irradiation, the optimized BBM-0.6 composite exhibits an exceptional degradation efficiency of 99.7% towards Rhodamine B (RhB). Notably, its apparent reaction rate constant vastly outperforms those of pristine Bi-MOF and isolated Mg-BiOCl. In-depth mechanistic investigations demonstrate that the superior photocatalytic performance originates from the well-defined heterojunction interface between Bi-MOF and Mg-BiOCl. This built-in interface significantly accelerates the spatial separation and migration of photogenerated electron-hole pairs, effectively impeding their recombination. Consequently, this work proposes a promising strategy for designing and constructing highly efficient and robust composite photocatalytic materials.</p>

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Construction of a Novel Mg-BiOCl/Bi-MOF Heterojunction for Enhanced Photocatalytic Degradation of Rhodamine B

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Xiaoyang Gai,
  • Limin Wang,
  • Wenwu Zhang

摘要

Developing efficient and stable visible-light-driven photocatalysts for the elimination of organic pollutants in aquatic environments remains a prominent research focus. In this study, a novel Mg-BiOCl/Bi-MOF heterojunction composite was successfully fabricated via a facile one-step solvothermal strategy. Herein, a bismuth-based metal-organic framework served as the structural template, while magnesium chloride was introduced as both a precursor and a regulating agent. Comprehensive characterizations reveal the in situ growth of Mg-BiOCl nanosheets on the Bi-MOF matrix, establishing a tight interfacial contact and a unique hierarchical porous architecture. This specific structural design significantly expands the specific surface area, thereby providing abundant catalytic active sites and facilitating efficient mass transfer channels for reactants. Under visible light irradiation, the optimized BBM-0.6 composite exhibits an exceptional degradation efficiency of 99.7% towards Rhodamine B (RhB). Notably, its apparent reaction rate constant vastly outperforms those of pristine Bi-MOF and isolated Mg-BiOCl. In-depth mechanistic investigations demonstrate that the superior photocatalytic performance originates from the well-defined heterojunction interface between Bi-MOF and Mg-BiOCl. This built-in interface significantly accelerates the spatial separation and migration of photogenerated electron-hole pairs, effectively impeding their recombination. Consequently, this work proposes a promising strategy for designing and constructing highly efficient and robust composite photocatalytic materials.