Synergistic effect and mechanism of mass transfer and catalytic oxidation of octane degradation in yolk-shell Fe3O4@C/Fenton system

•The synergistic effect of mass transfer and catalytic oxidation is investigated.•The octane removal efficiency is increased and the byproduct levels is decreased.•The volumetric mass transfer coefficient and the enhancement factor are calculated.•The regional reaction mechanism for yolk-shell Fe3O4@C/Fenton system is proposed.