Magnetic Fe_3O_4@MIL-53(Fe) nanocomposites derived from MIL-53(Fe) for the photocatalytic degradation of ibuprofen under visible light irradiation

摘要

A magnetic photocatalyst Fe3O4@MIL-53(Fe) was successfully obtained from the calcination treatment of pristine MIL-53(Fe) to degrade ibuprofen (IBP) under visible light. The results suggested that Fe3O4 and MIL-53(Fe) co-existed after the calcination of MIL-53(Fe) at 400 degrees C (CM53 - 400) and pearl-like Fe3O4 nanoparticle intimately combined with MIL-53(Fe) in CM53 - 400. Fe3O4@MIL-53(Fe) composites exhibited superior photocatalytic performance due to the unique structure and electron transfer between Fe3O4 and MIL-53(Fe). CM53 - 400 processed the best catalytic ability for IBP degradation, achieving 99 % removal of IBP in the presence of H2O2 within 60 min. The improved photocatalytic activity of CM53 - 400 may originate from the enhanced photoexcited electron-hole pairs separation. The active species, h(+), (OH)-O-center dot, e(-) and O(2)(center dot-)played important roles in the photo-degradation processes. In addition, due to the stable activity of CM53 - 400 toward IBP decomposition and the strong magnetism of CM53 - 400 composite, CM53 - 400 photocatalysts bring new insights into the practical application for removing the organic contaminants from water.