An efficient photo Fenton system for in-situ evolution of H2O2 via defective iron-based metal organic framework@ZnIn2S4 core-shell Z-scheme heterojunction nanoreactor

The fabrication of an efficient photoFenton system without the addition of H2O2 is still a challenge and is cost-effective and favorable for practical applications. In this work, a core@shell Z-scheme heterojunction nanoreactor was successfully fabricated, in which hierarchical two-dimensional (2D) ZnIn2S4 nanosheets are coated on defective iron-based metal-organic frameworks (MOFs) (NH2-MIL-88B(Fe)), realizing efficient in-situ evolution of H2O2 and constructing an optimal heterogeneous Fenton platform. The degradation rates of defective NH2-MIL-88B(Fe)@ZnIn2S4 (0.4 g L-1) for bisphenol A and ofloxacin under visible light irradiation within 180 min reached 99.4% and 98.5%, respectively, and the photocatalytic hydrogen production efficiency was approximately 502 μmol h-1 g-1. The excellent photoFenton performance was attributed to the introduction of ligand defects into the MOF, which can adjust the band structure to enhance the light absorption capacity, and the in-situ generation of H2O2 accelerating the Fe3+/Fe2+ conversion. In addition, the formation of the core@shell nanoreactor Z-scheme heterojunction structure promoted spatial charge separation. This strategy offers new ideas for constructing efficient photocatalysis and photoFenton systems.