Solvent-Assisted Linker Exchange to Fabricate Pyrene-Modified MIL-125(Ti) for Enhancing the Visible-Light-Driven Generation of Reactive Oxygen Species

Ti-oxide cluster-based metal–organic frameworks have shown great potential to fabricate multifunctional photocatalysts, but their catalytic activities often suffered from narrow light absorption and inefficient photogenerated charge separation. Herein, a solvent-assisted ligand exchange method was applied to functionalize MIL-125­(Ti) with pyrene. Benefitting from the low energy triplet state of pyrene and efficient intersystem charge transfer between photosensitizers and Ti-oxide clusters, the functionalized MIL-125­(Ti) showed enhancing visible-light adsorption and high photoactivity to give reactive oxygen species (•O2 – and 1O2), which can be employed as a visible-light-driven photocatalyst for tetracycline degradation and aerobic oxidation of sulfides.