Construction of ultra-stable and Z-scheme Fe-Graphdiyne/MIL-100(Fe) photo-Fenton catalyst with C = C-Fe|O interface for the highly enhanced catalytic degradation of Dinotefuran

High photo-Fenton catalytic activity and stable recycling performance are the main challenges for Fe-based metal-organic frameworks in practical applications of pesticide degradation. Herein, graphdiyne (GDY) with a unique sp/sp2 pi-conjugated structure was proposed to composite with MIL-100(Fe) to form the Z-scheme photocatalyst Fe-GDY3@MIL(Fe) for dinotefuran (DTF) degradation. A unique C = C-Fe|O interface was established between Fe-GDY and Fe-MOF owing to the confinement of GDY for anchoring Fe. Fe-GDY3@MIL(Fe) composite having tight C = C-Fe|O interface exhibited the highly conductive Z-scheme structure and dispersed Fe sites, which can efficiently enhance redox ability and accelerate Fe(III)/Fe(II) conversion cycle. Therefore, FeGDY3@MIL(Fe) showed 7-80 times of degradation kinetics and 2-5 times of mineralization kinetics compared to the state-of-the-art catalysts under relatively same conditions. Moreover, fast charge separation promoted the chemical stability and photo-corrosion resistance of MIL-100(Fe), which significantly enhanced catalytic stability and life-time.

Automated summary

In this study, the Z-scheme photocatalyst Fe-GDY3@MIL(Fe) was successfully developed by compositing with GDY, which effectively enhanced the catalytic performance and stability of Fe-based metal-organic frameworks for pesticide degradation, showing higher efficiency in degradation.