Faculty of Chemistry, Adam Mickiewicz University, Poznań, ul. Uniwersytetu Poznańskiego 8, 61-614, Poznań, Poland.
Sci Rep. 2024 Mar 25;14(1):7007. doi: 10.1038/s41598-024-57542-9.
This work aims to unravel the potential of copper(II) phosphate as a new promising heterogenous catalyst for the degradation of ciprofloxacin (CIP) in the presence of HO and/or visible light (λ > 400 nm). For this purpose, copper(II) phosphate was prepared by a facile precipitation method and fully characterized. Of our particular interest was the elucidation of the kinetics of CIP degradation on the surface of this heterogeneous catalyst, identification of the main reactive oxygen species responsible for the oxidative degradation of CIP, and the evaluation of the degradation pathways of this model antibiotic pollutant. It was found that the degradation of the antibiotic proceeded according to the pseudo-first-order kinetics. Copper(II) phosphate exhibited ca. 7 times higher CIP degradation rate in a Fenton-like process than commercial CuO (0.00155 vs. 0.00023 min, respectively). Furthermore, the activity of this metal phosphate could be significantly improved upon exposure of the reaction medium to visible light (reaction rate = 0.00445 min). In a photo-assisted Fenton-like process, copper(II) phosphate exhibited the highest activity in CIP degradation from among all reference samples used in this study, including CuO, FeO, CeO and other metal phosphates. The main active species responsible for the degradation of CIP were hydroxyl radicals.
本工作旨在揭示磷酸铜作为一种新型的非均相催化剂，在 HO 和/或可见光（λ > 400nm）存在下用于环丙沙星（CIP）降解的潜力。为此，通过简便的沉淀法制备了磷酸铜，并对其进行了全面表征。我们特别关注的是在该非均相催化剂表面上阐明 CIP 降解的动力学、确定对 CIP 氧化降解起主要作用的活性氧物种，以及评估该模型抗生素污染物的降解途径。结果发现，抗生素的降解遵循准一级动力学。与商业 CuO（分别为 0.00155 和 0.00023 min）相比，在类 Fenton 过程中，磷酸铜的 CIP 降解速率高约 7 倍。此外，当将反应介质暴露于可见光下时，这种金属磷酸盐的活性可以显著提高（反应速率=0.00445 min）。在光助类 Fenton 过程中，在所有用于本研究的参考样品中（包括 CuO、FeO、CeO 和其他金属磷酸盐），磷酸铜在 CIP 降解中表现出最高的活性。降解 CIP 的主要活性物质是羟基自由基。
