Magnetic porous ferrospinel NiFe2O4: A novel ozonation catalyst with strong catalytic property for degradation of di-n-butyl phthalate and convenient separation from water

► NiFe2O4 as catalyst in ozonation to degrade DBP in water first time. ► Ni2+ transferred electron from surface to induce ozone decomposition. ► A balance of Ni2+/Ni3+ and O2−/O2 is key factor to promote OH generation. ► Oxidation of lattice oxygen plays an essential role in catalytic balance process.