To　overcome　the　shortcomings　of　homogeneous　Fe　ion　activating　peroxymonosulfate　(PMS),　such　as　high　pH-dependence,　limited　cycling　of　Fe(III)/Fe(II)　and　sludge　production,　graphite　carbon　nitride　(g-C3N4)　is　chosen　as　a　support　for　Fe　ions,　and　reduced　graphene　oxide　(rGO)　is　employed　to　facilitate　the　electron　transfer　process,　thereby　enhancing　catalysis.　Herein,　a　ternary　catalyst,　Fe-g-C3N4/rGO,　is　first　applied　under　lightless　condition　for　PMS　activation,　which　exhibits　ideal　performance　for　contaminant　mineralization.　82.5　%　of　the　total　organic　carbon　(TOC)　in　100　mL　of　5　mg/L　bis-phenol　A　(BPA)　was　removed　within　20　min　by　the　optimal　catalyst　named　30%rFe0.2CN,　which　shows　a　strong　pH　adaptability　over　the　range　of　3–11　compared　with　a　common　Fenton-like　system.　Moreover,　the　highly　stable　Fe-g-C3N4/rGO/PMS　catalytic　system　resists　complex　water　matrices,　especially　those　with　high　turbidity.　To　unveil　the　mechanism　of　PMS　activation　and　pollutant　degradation,　the　physicochemical　properties　of　the　as-prepared　catalysts　are　comprehensively　characterized　by　multiple　techniques.　The　Fe(III)　contained　in　both　the　Fe-N　group　and　α-Fe2O3　component　of　30%rFe0.2CN　not　only　directly　reacts　with　PMS　to　produce　sulfate　radicals　([rad]SO4−)　and　hydroxyl　radicals　([rad]OH),　but　also　combines　with　PMS　to　form　the　essential　[Fe(III)OOSO3]+　active　complex,　thereby　generating　superoxide　radicals　([rad]O2−)　and　singlet　oxygen　(1O2).　Among　the　various　reactive　oxidizing　species,　1O2　plays　an　important　role　in　pollutant　removal,　which　is　additionally　generated　by　the　C[dbnd]O　moiety　of　the　catalyst　activating　PMS　as　well　as　PMS　self-oxidation,　indicating　the　dominance　of　the　non-radical　pathway　in　the　pollutant　degradation　process.　Due　to　the　advantages　of　high　efficiency,　wide　pH　adaptability　and　stability,　the　proposed　lightless　Fe-g-C3N4/rGO/PMS　catalytic　system　represents　a　promising　avenue　for　practical　wastewater　purification.　©　2022