Boosting charge transfer promotes photocatalytic peroxymonosulfate activation of S-doped CuBi2O4 nanorods for ciprofloxacin degradation: Key role of Ov–Cu–S and mechanism insight

光催化 纳米棒 降级(电信) 兴奋剂 化学 化学工程 纳米技术 材料科学 催化作用 光电子学 计算机科学 电信 有机化学 工程类
作者
Xianzhong Bu,Jiaming Li,Jin Wang,Yuan Li,Gaoke Zhang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:494: 153075-153075 被引量:23
标识
DOI:10.1016/j.cej.2024.153075
摘要

The regulation of the metal–oxygen tetrahedron active center in spinel catalysts is crucial for enhancing the photocatalytic activation of peroxymonosulfate (PMS) to degrade organic pollutants. Herein, S−doped CuBi2O4 (CBOS) catalysts with surface oxygen vacancies (Ov) were prepared via a one-step hydrothermal method. The cycling of Cu(I)/Cu(II) and the trapping of photogenerated electrons by Ov significantly enhance the migration of photogenerated carriers. Density functional theory (DFT) calculations revealed that the synergistic effect of S doping and Ov successfully modulated the charge distribution around the Cu site in Cu−O tetrahedron. Furthermore, the exceptional adsorption and activation abilities of Ov−Cu−S on PMS greatly enhanced the photocatalytic activation of S−doped CuBi2O4, which resulted in the degradation of ciprofloxacin (CIP). The optimal CBOS2 was capable of removing 95.3 % of CIP in 60 min, a 40.7 % increase compared to pure CuBi2O4. Electron paramagnetic resonance (EPR) spectroscopy and quenching tests confirmed the synergistic effect of radical and non-radical mixed pathways (SO4•−, •OH, 1O2) on the removal of CIP. The potential pathways for CIP degradation were further explored using liquid chromatography-mass spectrometry (LC−MS) test results. This study offers a novel perspective for the research and application of spinel-based catalysts in water treatment.
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