Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China; Joint School of National University of Singapore and Tianjin University, Fuzhou International Campus, Tianjin University, Binhai New City, Fuzhou 350207, China.
Sci Total Environ. 2021 May 10;768:144368. doi: 10.1016/j.scitotenv.2020.144368. Epub 2020 Dec 30.
The residual ciprofloxacin (CIP) in water seriously menaces the ecological safety and public health. Here, a Fe-free photo-electro-Fenton-like (PEF) system was designed for efficient degradation of CIP in water. A Z-scheme MnO/g-CN (MCN) nanocomposite with low-cost, large specific surface area and abundant active sites was successfully synthesized as a photoelectric catalyst. The XPS analysis indicated the presence of Mn, Mn and Mn in the MCN (1:6) composite, and the conversion among polyvalent manganese made the decomposition of HO more efficient. Therefore, the manganese ions replaced the Fe element in traditional Fenton system. With the MCN (1:6), the PEF system could also produce O, OH and h under the visible light irradiation. The synergetic excitation of multiple active species promoted the rapid decomposition of CIP. Besides, the polyvalent property of manganese oxide resulted in the presence of oxygen vacancies which could improve the electrocatalytic reactivity of the catalyst. Finally, the degradation efficiency of CIP was 96.23% in 120 min and the mineralization efficiency was 80.02% in 240 min.
水中残留的环丙沙星（CIP）严重威胁着生态安全和公众健康。在这里，设计了一种无铁光电芬顿样（PEF）系统，用于水中 CIP 的有效降解。成功合成了一种具有低成本、大比表面积和丰富活性位点的 Z 型 MnO/g-CN（MCN）纳米复合材料作为光电催化剂。XPS 分析表明，在 MCN（1:6）复合材料中存在 Mn、Mn 和 Mn，多价锰的转化使 HO 的分解更有效。因此，锰离子取代了传统芬顿体系中的铁元素。在 MCN（1:6）的作用下，PEF 系统在可见光照射下也可以产生 O、OH 和 h。多种活性物质的协同激发促进了 CIP 的快速分解。此外，氧化锰的多价性质导致存在氧空位，这可以提高催化剂的电催化活性。最后，CIP 在 120 分钟内的降解效率为 96.23%，在 240 分钟内的矿化效率为 80.02%。
