The　study　synthesized　nitrogen-doped　cobalt　oxide　precursors　using　a　one-pot　hydrothermal　method.　Three　catalysts,　N&CoO-Ar,　N&CoO-N,　and　N&CoO-NH,　were　obtained　by　calcination　under　different　atmospheric　environments　(argon,　nitrogen,　and　nitrogen-hydrogen　mixture).　Characterization　results　showed　that　all　the　prepared　materials　consisted　primarily　of　carbon　components　and　cobalt　oxide,　while　the　catalysts　calcined　in　a　nitrogen-hydrogen　atmosphere　owned　the　highest　content　of　pyridine　nitrogen.　Degradation　experiments　on　sulfapyridine　(SPD)　showed　that　the　N&CoO-NH/PMS　system　exhibited　the　best　SPD　degradation　performance　(the　apparent　rate　constants　were　3.0,　5.1　and　8.3　times　larger　those　of　N&CoO-N/PMS,　N&CoO-Ar/PMS,　and　pure　CoO/PMS),　and　was　able　to　rapidly　degrade　the　pollutant　within　5　min.　The　quenching　experiments　and　electrochemical　experiments　indicated　that　the　nitrogen　component　modulation　improved　the　chemisorption　between　PMS　and　N&CoO-NH　and　enhanced　the　electron　transfer　efficiency　between　N&CoO-NH/PMS　and　the　pollutant.　In　addition,　the　N&CoO-NH/PMS　system　exhibited　good　stability　and　a　wide　pH　applicability.　Furthermore,　N&CoO-NH/PMS　also　exhibited　good　anti-interference　performance　in　the　presence　of　Cl-,　HCO3-,　NO3-,　PO42-,　CO32-,　and　HA,　as　well　as　excellent　feasibility　of　treating　actual　wastewater.