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<p>Design of chemically bonded heterojunction with oxygen vacancies is a serviceable method to facilitate the performance of metal-organic framework (MOFs). Herein, Bi–MOF as bismuth source and frame, chemically bonded close-contact Bi/BiOBr@Bi–MOF heterojunction with intact backbone was successfully developed by two-step easy in situ halogenation and photoreduction of Bi–MOF. The halide amount and photoreduction time regulate the BiOBr and metal Bi loading amount and oxygen defects concentration. Bi/BiOBr@Bi–MOF-5-1 revealed the best photocatalytic efficiency (rate constant) of 97.1% (0.0607&#xa0;min<sup>−1</sup>) toward chlortetracycline (CTC) after full-spectrum light irradiation for 60&#xa0;min. The rate constants were 7.2, 2.2, and 2.2 times higher than Bi–MOF, BiOBr, and Bi/BiOBr-5 without MOF structure, respectively, which is owing to the synergistic effect among Bi–MOF framework, OVs, and mediator-based Z-scheme heterojunction by chemically bonding with metal Bi as carrier transfer bridge. This study provides a broad prospect for reasonable design and flexible synthesis of semiconductor/MOF heterojunction with Bi–MOF as nice precursor.</p>

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In situ growth of Bi0 and BiOBr on Bi-MOF nanoribbons via chemically bond for boosting the photocatalytic chlortetracycline removal by MOF framework, oxygen vacancies, and mediator-based Z-scheme heterojunction

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Ziqi Yang,
  • Fengyan Ma,
  • Yu Zhang,
  • Meihua Ling,
  • Hong Zheng,
  • Yan Yu,
  • Li Li

摘要

Design of chemically bonded heterojunction with oxygen vacancies is a serviceable method to facilitate the performance of metal-organic framework (MOFs). Herein, Bi–MOF as bismuth source and frame, chemically bonded close-contact Bi/BiOBr@Bi–MOF heterojunction with intact backbone was successfully developed by two-step easy in situ halogenation and photoreduction of Bi–MOF. The halide amount and photoreduction time regulate the BiOBr and metal Bi loading amount and oxygen defects concentration. Bi/BiOBr@Bi–MOF-5-1 revealed the best photocatalytic efficiency (rate constant) of 97.1% (0.0607 min−1) toward chlortetracycline (CTC) after full-spectrum light irradiation for 60 min. The rate constants were 7.2, 2.2, and 2.2 times higher than Bi–MOF, BiOBr, and Bi/BiOBr-5 without MOF structure, respectively, which is owing to the synergistic effect among Bi–MOF framework, OVs, and mediator-based Z-scheme heterojunction by chemically bonding with metal Bi as carrier transfer bridge. This study provides a broad prospect for reasonable design and flexible synthesis of semiconductor/MOF heterojunction with Bi–MOF as nice precursor.