Degradation of Methylene Blue by Surface Dielectric Barrier Discharge Plasma Coupled With Polyvinylidene Fluoride/Fe3O4 Composite Nanofibers Having a Rough Surface

A comb shaped surface dielectric barrier discharge (SDBD) reactor coupled with polyvinylidene fluoride (PVDF)/Fe 3 O 4 composite nanofibers was investigated to degrade methylene blue (MB) in water. The PVDF/Fe 3 O 4 nanofibers with a rough surface were prepared when the proportion of Fe 3 O 4 NPs in a 14 wt% PVDF spinning solution was 7 wt%. Compared to SDBD plasma alone, the addition of PVDF/Fe 3 O 4 nanofibers significantly increased the degradation rate, degradation amount, kinetic constant, energy efficiency, and chemical oxygen demand removal rate of the MB solution. Active species trapping test revealed that •OH played the most important role during MB degradation, •O 2− , H 2 O 2 , electrons, and holes were also crucial. After five repeated uses, the PVDF/Fe 3 O 4 nanofibers maintained high catalytic activity, chemical stability, and mechanical strength.