Fabrication of Bi2Sn2O7@MIL-100(Fe) composite photocatalyst with enhanced superoxide-radical-dominated photocatalytic activity for ciprofloxacin degradation

• Published in: Journal of molecular structure Vol. 1258; p. 132657
• Main Authors: Wu, Chenyan, Shen, Qianhong, Zheng, Suhua, Zhang, Xinyu, Sheng, Jiansong, Yang, Hui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.06.2022
• Subjects: Bi2Sn2O7; Ciprofloxacin; MIL-100(Fe); Photocatalysis; superoxide radicals; MIL-100(Fe); Ciprofloxacin; superoxide radicals; Bi2Sn2O7; Photocatalysis
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2022.132657

•A high-specific-surface-area MIL-100(Fe)-based photocatalytic material with abundant photo-generated electrons was successfully synthesized by a hydrothermal method.•The Bi2Sn2O7@MIL-100(Fe) heterojunction exhibits excellent superoxide-radical-dominated photocatalytic activity for CIP.•The •O2− radicals are the predominant reactive species in the photocatalytic process and h+ radicals are also responsible for CIP degradation. A novel Bi2Sn2O7@MIL-100(Fe) composite photocatalyst was fabricated by loading Bi2Sn2O7 nanoparticles on the surface of mesoporous MIL-100(Fe). The structure-property relationships of such composite photocatalyst were studied. The results exhibit that the formed Bi2Sn2O7@MIL-100(Fe) heterojunction promote the separation of photo-generated carriers, leading to the enrichment of photo-generated electrons on MIL-100(Fe). Meanwhile, MIL-100(Fe) can provide more active sites for photocatalytic reaction due to its extraordinary specific surface area. Therefore, the Bi2Sn2O7@MIL-100(Fe) composite photocatalyst exhibits excellent superoxide-radical-dominated photocatalytic activity and is more propitious to degrading the contaminants such as ciprofloxacin, which can be efficiently degraded in the absence of superoxide radicals. The Bi2Sn2O7@MIL-100(Fe) composite reveals enhanced photocatalytic activity for degrading ciprofloxacin with rate constant (0.0143 min−1) 1.96 and 3.86 times higher than that of pure MIL-100(Fe) (0.0073 min−1) and pure Bi2Sn2O7 (0.0037 min−1), respectively. [Display omitted]