Biomimetic O2-carrying and highly in-situ H2O2 generation using Ti3C2 MXene/MIL-100(Fe) hybrid via Fe-Protoporphyrin bridging for photo-fenton synergistic degradation of thiacloprid.

[Display omitted] • MXene/MIL(Fe) with Fe-protoporphyrin bridging was applied as photo-Fenton catalyst. • Biomimetic Fe-protoporphyrin showed high O 2 -carrying capacity for H 2 O 2 generation. • Schottky barrier enhanced charge transfer and O 2 reduction for H 2 O 2 generation. • MXene/MIL(Fe)-POR exhibited 12 times higher H 2 O 2 production rate than MIL(Fe) • MXene/MIL(Fe)-POR showed 60 times higher TCL removal rate than reported catalysts. Efficient and deep degradation for organic contaminants in the absence of externally supplied H 2 O 2 is still a challenge and research hotspot for photo-Fenton catalysis. In this work, a novel Ti 3 C 2 MXene/MIL-100(Fe) hybrid via Fe-protoporphyrin bridging was proposed to in-situ generate H 2 O 2 for photo-Fenton catalytic degradation of thiacloprid (TCL). The generated Schottky junction between MXene and MIL-100(Fe) and biomimetic oxygen-carrying from Fe-protoporphyrin constructed a synergistic system to promote H 2 O 2 generation and photo-Fenton reaction. As expected, MXene/MIL-100(Fe) exhibited 12 times higher of H 2 O 2 generation rate (reaching 1175.2 μmol/L under air-bubble), and 24 times of degradation rate and 3.7 times of mineralization rate for TCL compared to MIL-100(Fe). In addition, MXene/MIL-100(Fe) possessed 21–60 times higher TCL degradation rate than many of reported photo-Fenton catalysts in H 2 O 2 -free system. MXene/MIL-100(Fe) realized > 80 % TOC removal of TCL (80 mg/L) within 120 min, and exhibited excellent catalytic stability (>97 % TCL degradation) for 10 successive reuses. [ABSTRACT FROM AUTHOR]