Fabrication of Bi2Sn2O7@MIL-100(Fe) composite photocatalyst with enhanced superoxide-radical-dominated photocatalytic activity for ciprofloxacin 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 photo catalyst 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. (C)& nbsp;2022 Elsevier B.V. All rights reserved.