Titanium dioxide/magnetic metal-organic framework preparation for organic pollutants removal from water under visible light

Developing high-efficient supporter is important for enhancing pollutants removal efficiency of a catalyst. Materials Institute Lavoisier-101(Cr) (MIL-101(Cr)) is one of metal-organic frameworks (MOFs). In this study, a novel visible-light-driven absorptive photocatalyst, TiO2-loaded magnetic MOFs composite (TiO2/mag-MIL-101(Cr)), was synthesized to improve the reusability, the adsorption and photocatalytic efficiency under visible-light. The as-synthesized TiO2/mag-MIL-101(Cr) was systematically characterized and used for adsorbing and photodegrading refractory organics, bisphenol-F (BPF) and acid red 1 (AR1), from water. Mag-MIL-101(Cr) remarkably enhances the light-absorption of TiO2, and the band-gap value of TiO2 /mag-MIL-101(Cr) is 1.61 eV. TiO2/mag-MIL-101(Cr) exhibited outstanding removal efficiency to bisphenol-F and AR1, which was attribute to the large adsorption capacity of mag-MIL-101(Cr) and the enhanced separation properties of photogenerated electrons and holes. In the photocatalytic process, h(+) is proved to be a predominant active species, while center dot OH and center dot O-2(-) play an auxiliary role. The proposed strategy is an attempt to design new semiconductor-MOF photocatalytic materials for degrading organic contaminants in water under visible light.