College of Biological and Environmental Engineering, Changsha University, Changsha, 410022, China.
College of Biological and Environmental Engineering, Changsha University, Changsha, 410022, China.
Chemosphere. 2022 Jan;287(Pt 4):132391. doi: 10.1016/j.chemosphere.2021.132391. Epub 2021 Sep 28.
In this work, a novel BiOCl/Cu-doped BiS photocatalyst was designed to efficiently remove ciprofloxacin (CIP) with high photocatalytical activity and good stability over a wide pH range. Compared with Cu-doped BiS, BiS, BiOCl, BiOCl/BiS, and Cu-doped BiOCl, the photocatalytical degradation rate of CIP (97.1% at 20 mg/L) over BiOCl/Cu-doped BiS was enhanced by about 84.77, 44.23, 2.95, 2.27, and 1.96 times within 20 min, respectively. Notably, the BiOCl/Cu-doped BiS photocatalyst also displayed high photocatalytical performance in the degradation of other antibiotics including norfloxacin, ofloxacin, and tetracycline (40 mL, 20 mg/L; 88.3%, 100%, and 95.2% of degradation rate within 30 min, respectively) under visible light irradiation. Radical trapping experiments and electron spin resonance technique indicated that superoxide radicals (•O) and photogenerated holes (h) played crucial roles in the photocatalytic degradation of CIP. Finally, the possible CIP degradation pathways was proposed by detecting the CIP intermediates in photocatalytical reaction process.
在这项工作中，设计了一种新型的 BiOCl/Cu 掺杂 BiS 光催化剂，以在宽 pH 范围内具有高效去除环丙沙星 (CIP) 的光催化活性和良好的稳定性。与 Cu 掺杂的 BiS、BiS、BiOCl、BiOCl/BiS 和 Cu 掺杂的 BiOCl 相比，BiOCl/Cu 掺杂的 BiS 对 CIP 的光催化降解速率（20 mg/L 时为 97.1%）分别提高了约 84.77、44.23、2.95、2.27 和 1.96 倍，在 20 分钟内。值得注意的是，BiOCl/Cu 掺杂的 BiS 光催化剂在可见光照射下对其他抗生素（诺氟沙星、氧氟沙星和四环素）的降解也表现出高的光催化性能（40 mL，20 mg/L；30 分钟内降解率分别为 88.3%、100%和 95.2%）。自由基捕获实验和电子自旋共振技术表明，超氧自由基（•O）和光生空穴（h）在 CIP 的光催化降解中起着关键作用。最后，通过检测光催化反应过程中的 CIP 中间体，提出了可能的 CIP 降解途径。
