Preparation and application of low-temperature-resistant nitrogen self-doped hollow carbon sphere supported iron catalyst

The invention discloses a preparation method and application of a low-temperature-resistant nitrogen self-doped hollow carbon sphere supported iron catalyst. According to the catalyst, a nanoscale silicon dioxide sphere serves as a core, and an iron source and dopamine are combined to form a polymerized dopamine shell layer with the iron source; after calcination and washing, the low-temperature-resistant nitrogen self-doped hollow carbon sphere supported iron catalyst is prepared, and iron supported in the catalyst does not contain iron polymers and is monatomic iron. The catalyst has a hollow structure, is large in reaction contact area and high in catalytic site exposure rate, can efficiently activate persulfate to degrade toxic organic pollutants in water, activates the persulfate to degrade the pollutants through a non-free radical way, can resist a low-temperature environment, effectively avoids interference of various ions in an actual wastewater complex pollution system, and has a good application pro