Photocatalysts based on copper-doped bismuth oxybromide (Cu-doped BiOBr) were synthesised using a solvothermal method and assessed for their ability to degrade norfloxacin under visible light. The Cu atoms were successfully doped into the crystal lattice of BiOBr, yielding Cu-doped BiOBr microflowers with a morphology and crystal structure identical to that of pristine BiOBr. The as-prepared Cu-doped BiOBr showed activity superior to BiOBr in the photocatalytic degradation of norfloxacin under visible-light irradiation, which was attributed to its improved light-harvesting properties, enhanced charge separation and interfacial charge transfer. Furthermore, we found for the first time that the introduction of Cu into BiOBr enhanced the adsorption capacity between the photocatalyst and norfloxacin, which we considered to be the main contribution to its improved performance. Cu-doped BiOBr containing the optimal proportion of Cu and Bi (Cu:Bi = 0.03) had a photocatalytic degradation constant of 0.64 ×10⁻² min⁻¹, which is 2.28 times higher than that of undoped BiOBr. The primary oxidation pathway was determined to involve the transfer of photogenerated holes to norfloxacin. Finally, we demonstrated that the Cu-doped BiOBr photocatalyst retained 95% of its initial activity even after five successive catalytic cycles, confirming its recyclability.

使用溶剂热法合成了基于铜掺杂的氢溴酸铋（Cu掺杂的BiOBr）的光催化剂，并评估了它们在可见光下降解诺氟沙星的能力。将Cu原子成功地掺杂到BiOBr的晶格中，得到的Cu掺杂BiOBr微型花的形态和晶体结构与原始BiOBr相同。制备的Cu掺杂BiOBr在可见光照射下对诺氟沙星的光催化降解表现出优于BiOBr的活性，这归因于其改善的光收集性能，增强的电荷分离和界面电荷转移。此外，我们首次发现将铜引入BiOBr可增强光催化剂与诺氟沙星之间的吸附能力，我们认为这是对其性能改善的主要贡献。包含最佳比例的Cu和Bi（Cu：Bi = 0.03）的Cu掺杂BiOBr的光催化降解常数为0.64×10⁻²  min ^-1，比未掺杂的BiOBr高2.28倍。确定的主要氧化途径涉及将光生空穴转移至诺氟沙星。最后，我们证明了即使在连续五个催化循环后，掺杂Cu的BiOBr光催化剂也保留了其95％的初始活性，从而证实了其可回收性。