Petroleum hydrocarbons,as a widely used raw material worldwide,are not easily decomposed in soil for a long time and can easily cause long-term pollution of surface water and groundwater.The degradation behavior of petroleum hydrocarbons by a novel composite graphene sponge loaded Fe3O4(GO/PDMS-PU/Fe3O4)activated persulfate system activated persulfate system is explored under different catalyst mass ratio,initial pH,persulfate concentration,petroleum hydrocarbons concentration,and coexisting anions.It is found that the composite material with a Fe3O4 to GO/PDMS-PU mass ratio of 1:2 delivers the optimal degradation efficiency of 88％.The acidic and neutral conditions are more favorable for removal of petroleum hydrocarbons,achieving a removal efficiency of 85％when persulfate dosage is 1 mM and catalyst dosage is 0.3 g·L-1.It is shown by the free radical quenching experiment and EPR test of GO/PDMS-PU/Fe3O4+PS system that·SO4-and·OH are the main free radicals,and there exists a certain amount of 1O2.
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