Effective charge-carrier separation and molecular oxygen activation are crucial factors for photocatalytic environmental purification. Herein, an efficient Fe-doped Bi₇O₉I₃ microflowers photocatalyst was synthesized. It was discovered that Fe doping could not only tune the concentration of oxygen vacancies of Bi₇O₉I₃ to optimize the dissociation of excitons, but also promote the separation of charge-carriers and the activation of oxygen molecules. Meanwhile, the inducing of surface oxygen vacancies and Fe³⁺/Fe²⁺ by Fe optimal doping can act as the activation center for catalytic reactions, which also significantly enhances the photocatalytic activity. Benefiting from the optimized properties, the photocatalytic activity of Fe-doped Bi₇O₉I₃ photocatalyst has been significantly improved by more than 4 times. Finally, we proposed that a highly efficient catalytic oxidation reaction mechanism can be achieved via modulating Fe doping to induce oxygen vacancies to promote charge separation and molecular oxygen activation. This work provides a novel approach for designing efficient photocatalysts.

有效的载流子分离和分子氧活化是光催化环境净化的关键因素。在此，合成了高效的Fe掺杂的Bi ₇ O ₉ I ₃微花光催化剂。发现Fe掺杂不仅可以调节Bi ₇ O ₉ I ₃的氧空位浓度以优化激子的离解，而且可以促进电荷载流子的分离和氧分子的活化。同时，诱导表面氧空位和Fe ³⁺ / Fe ²⁺通过Fe的最佳掺杂可以充当催化反应的活化中心，这也显着增强了光催化活性。得益于优化的性能，掺Fe的Bi ₇ O ₉ I ₃光催化剂的光催化活性已显着提高了4倍以上。最后，我们提出可以通过调节铁的掺杂来诱导氧空位，从而促进电荷分离和分子氧活化，从而实现高效的催化氧化反应机理。这项工作为设计高效的光催化剂提供了一种新颖的方法。