可见光谱
催化作用
化学
光催化
双功能
光化学
氧化还原
空位缺陷
降级(电信)
激进的
氧气
材料科学
无机化学
光电子学
结晶学
有机化学
电信
计算机科学
作者
Jianhui Zhao,Yuanzhou Wang,Ning Li,Shaopo Wang,Junli Yu,Xinxin Li
出处
期刊:Chemosphere
[Elsevier]
日期:2021-08-01
卷期号:276: 130257-130257
被引量:44
标识
DOI:10.1016/j.chemosphere.2021.130257
摘要
In this work, the magnetic γ-Fe2O3–MnO2 bifunctional catalyst with oxygen vacancy was synthesized for peroxymonosulfate (PMS) activation under visible light. The activity of γ-Fe2O3–MnO2 was investigated by ciprofloxacin (cipro) degradation. Results showed that 98.3% of cipro (50 μM) was removed within 30 min in visible-light/PMS system mediated by γ-Fe2O3–MnO2 (2:1) with fine-tuned oxygen vacancy. The cipro degradation data fitted well with pseudo-first-order kinetic model with the highest kinetic constant of 0.114 min−1. Besides, the γ-Fe2O3–MnO2 exhibited stability, recyclability and practicability. High selectivity for cipro degradation was observed with coexisting anions in visible-light/γ-Fe2O3–MnO2/PMS system. Furthermore, the enhanced mechanism of PMS activation under visible light with γ-Fe2O3–MnO2 was proposed. The appropriate oxygen vacancy enhanced the separation of photo-induced carriers and Z scheme heterostructure maintained the highest redox potential. Accordingly, the synergistic effect of photocatalysis and PMS activation enhanced cipro degradation. Free radical and non-radical species including , h+, 1O2, •OH and co-existed in the coupled system. Impressively, this study provides a handy approach for oxygen vacancy regulation in metallic oxides composite and an easily recycled catalyst with high-activity in coupled oxidation system towards antibiotic degradation.
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