For the first time, we fabricated Au-BiOBr-Co₃O₄ hierarchical flower-like microspheres by hydrothermal and photo-deposition methods. Au and Co₃O₄ nanoparticles (NPs) were selectively deposited on the {0 0 1} and {1 1 0} facets of BiOBr nanopetals, respectively. The light absorption, photoluminescence (PL), and electrochemical analyses revealed that the selectively deposited Au and Co₃O₄ can effectively enhance both the visible-light absorption and charge carrier separation in space. The photocatalytic degradation of sulfadiazine (SD) indicated that the degradation of SD follows the pseudo-first-order reaction and the reaction rate constant was increased 17 times from BiOBr flower-like microspheres (0.00014 min⁻¹) to Au and Co₃O₄ co-modified Au-BiOBr-Co₃O₄ flower-like microspheres (0.00254 min⁻¹). From the high performance liquid chromatography-mass spectrometry (HPLC-MS) measurement, it was disclosed that the desulfonated and bromized products are the main intermediates during SD degradation over Au-BiOBr-Co₃O₄. Meanwhile, the reactive species trapping experiments confirmed that Au-BiOBr-Co₃O₄ can produce h⁺, O₂⁻, and Br⁰ reactive species responsible for antibiotic degradation. On the basis of these experiment results and discussion, the degradation mechanism of SD over Au-BiOBr-Co₃O₄ was tentatively discussed. We think this work provides a reference to fabricate novel photocatalytic materials for the effective degradation of antibiotics.

首次采用水热法和光沉积法制备了Au-BiOBr-Co ₃ O ₄分层花状微球。将Au和Co ₃ O ₄纳米颗粒（NPs）分别选择性沉积在BiOBr纳米花瓣的{0 0 1}和{1 1 0}面上。光吸收，光致发光（PL）和电化学分析表明，选择性沉积的Au和Co ₃ O ₄可以有效增强空间中可见光的吸收和载流子的分离。磺胺嘧啶（SD）的光催化降解表明，SD的降解遵循拟一级反应，反应速率常数从BiOBr花状微球（0.00014 min ^-1）增至Au和Co ₃ O ₄达17倍共修饰的Au-BiOBr-Co ₃ O ₄花状微球（0.00254 min ^-1）。通过高效液相色谱-质谱（HPLC-MS）测量，揭示了在Au-BiOBr-Co ₃ O _4上SD降解过程中，脱硫和溴化产物是主要中间体。。同时，捕集实验的反应性物种确认的Au-BiOBr钴₃ ö ₄可以生成H ⁺，Ö ₂ ^-和Br ⁰反应性物质负责抗生素降解。在这些实验结果和讨论的基础上，初步探讨了SD在Au-BiOBr-Co ₃ O _4上的降解机理。我们认为这项工作为制造有效降解抗生素的新型光催化材料提供了参考。