Hierarchical porous structure of urushiol mediated Fe3O4/three-dimensional graphene composites towards enhanced Fenton degradation of tetracycline

The Fenton like catalyst Fe3O4 is still limited in wastewater treatment due to its narrow pH range, metal shedding and low catalytic efficiency. Here, a robust urushiol mediated Fe3O4/three-dimensional (3D) graphene was proposed to tackle these challenges. Fe3O4/3D-PU-G (H) was established by loading dense Fe3O4 nanoparticles onto urushiol functionalized 3D graphene via simple solvothermal and mild post-heating. It exhibited rapid degradation (50.3% in 10 s, 97.3% in 10 mins) and reusability (86.8% after 7 cycles) of tetracycline (TC) in a wide pH range (3-11) and various waste water samples. Such excellent performance was attributed to the formation of a stable and compact 3D porous conductive network, which promotes the electron transfer between Fe species and H2O2, the activation of H2O2 to generate & BULL;OH and the reaction between & BULL;OH and TC. This work provides a feasible approach for the preparation of efficient heterogeneous catalytic materials.