Porous graphene/MXene composite fibres with adsorptive and Electro-Fenton catalytic properties for dye wastewater degradation

Porous graphene fibre, as a typical carbon-based electrode material, offers numerous advantages including high electrical conductivity, low density and a large specific surface area, leading to its growing demand in the field of dye wastewater degradation. In this study, a porous graphene/MXene composite fibre was fabricated via wet-spinning. The improved GF/MXene-10 material demonstrates exceptional results, with high electrical conductivity (831.35 S/cm), a large specific surface area (99.1173 m 2 /g), strong mechanical strength (140.68 MPa) and exceptional catalytic activity. In terms of dye adsorption, within 7.5 h a 21 cm-long fibre attained an adsorption rate of 85.9% for 35 mL of dye solution. These properties collectively contribute to reduced energy loss during current transmission, enhanced interfacial reaction kinetics and lowered overpotential for the oxygen reduction reaction (ORR), leading to superior degradation performance while reducing the energy consumption of the Electro-Fenton (EF) process. When applied as an electrode in the EF system for methylene blue degradation, GF/MXene-10 achieved 100% removal within 15 min in the first cycle and maintained excellent recyclability. Moreover, the material demonstrated promising degradation efficiency for commercial acid dye wastewater. This study provides a highly promising technical pathway for the efficient treatment of dye wastewater.