Bimetallic iron-nickel nanoparticles possessed an enhanced performance on aerobic degradation of 4-CP.
Hydroxyl radicals were the major active species contributed to aerobic 4-CP degradation with nZVI.
Superoxide radicals predominated the 4-CP degradation in the nZVIN/Air process.
The 4-CP degradation pathways were dependent on the generated superoxide radicals in the nZVIN/Air process.