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The Construction of S-Scheme Heterojunction between P-CN/NCDs/Fe3O4 to Enhance the Synergistic Degradation of Levofloxacin by Photo-Fenton Oxidation
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178189 Xiaoling Liu, Wanyi Liu, Haijuan Zhan, Meng Wen, Qi Guo, Xiaoyan Chen, Heping Li
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.jallcom.2024.178189 Xiaoling Liu, Wanyi Liu, Haijuan Zhan, Meng Wen, Qi Guo, Xiaoyan Chen, Heping Li
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In this paper, ternary nanocomposites (P-CN/NCDs/Fe3O4) with S-scheme heterojunction was successfully composited by anchoring Fe3O4 onto nitrogen-doped carbon quantum dots (NCDs)-modified protonated graphitic carbon-nitride (P-CN) with the aid of hydrothermal and co-precipitation methods. This composite material exhibited efficient photocatalytic degradation ability towards the antibiotic levofloxacin (LEV), with a 5.6-fold degradation performance than that of CN and good cycling stability. The rapid transfer of photo-generated electrons through heterojunction not only reduced the adsorbed O₂ on the catalyst surface to generate •O2-, but also oxidized H2O to generate •OH. At the same time, it improved the cycling of Fe (III) and Fe (II), and further enhanced the photocatalytic degradation effect of LEV. More importantly, the ternary structure achieved sound charge separation, which was the key to improving the photocatalytic efficiency. The internal electric field generated at the interface of Fe3O4 and P-CN/NCDs through an S-scheme heterojunction, which synergistically promoted photocatalysis and Fenton catalysis, improved the spatial separation and transfer characteristics of carriers, and enhanced the degradation effect of photo-Fenton and increased the degradation of antibiotics. This study not only deepens the understanding of the catalytic mechanism but also provides new strategies and methods to solve the problem of antibiotic contamination.
更新日期：2024-12-20
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