Efficient removal of antibiotic thiamphenicol by pulsed discharge plasma coupled with complex catalysis using graphene-WO3-Fe3O4 nanocomposites

•Graphene-WO3-Fe3O4 were synthetized to achieve complex catalysis in PDP system.•Highest removal efficiency of TAP reached 99.3% in PDP system with rGWFe-24.•Graphene-WO3-Fe3O4 could catalyze O3 and H2O2 into ·OH simultaneously.•The degradation pathway was proposed based on intermediates and DFT analysis.•The toxicity of intermediates was assessed according to US-EPA-TEST.