The　activation　of　peroxymonosulfate　(PMS)　over　carbon　nitride-based　photocatalysts　towards　refractory　organic　removal　has　received　growing　attention　in　wastewater　treatment.　In　this　study,　we　successfully　synthesized　copper　single　atoms　incorporated　into　crystalline　carbon　nitride　(Cu-CCN)　and　applied　it　to　activate　PMS　towards　bisphenol　A　(BPA)　removal.　The　characterization　and　theoretical　calculation　results　indicated　that　Cu-CCN　had　good　crystallinity,　outstanding　charge　separation　and　transfer　ability,　and　numerous　PMS　adsorption　and　activation　sites　provided　by　Cu　single　atoms.　Consequently,　Cu-CCN　demonstrated　an　enhanced　ability　to　activate　PMS　for　BPA　degradation.　The　activity　performance　of　Cu-CCN　was　affected　by　the　experimental　conditions　at　different　levels,　and　the　catalyst　had　good　stability　in　structure　and　activity　during　cyclic　runs.　A　plausible　reaction　mechanism　was　also　proposed　according　to　free　radical　trapping　and　quenching　experiments.　This　oxidation　process　can　efficiently　degrade　organic　pollutants　as　well　as　reduce　the　toxicity.　The　findings　of　this　work　elucidated　an　efficient　photocatalyst　for　activating　PMS　towards　organic　removal　and　might　guide　the　design　of　other　metal　single-atom　modified　photocatalysts.　©　2023　Elsevier　B.V.