The　photocatalytic　degradation　of　dyes　by　graphitic　carbon　nitrides　(g-C3N4)　under　sunlight　has　received　increased　attention.　However,　the　fast　recombination　of　charge　carriers　still　restricts　its　photocatalytic　application.　To　overcome　this　drawback,　a　g-C3N4/Mn3O4/ZIF-8　(CMZ)　composite　was　prepared　to　activate　peroxymonosulfate　(PMS)-based　advanced　oxidation　processes　for　degradation　of　rhodamine　B　(RhB)　in　water.　Under　visible　light,　the　catalysts　exhibited　high　activity　and　stability　in　activating　PMS　to　generate　radicals　(·OH,　·O2　−　and　SO4·-)　and　the　maximum　RhB　degradation　of　approximately　94.34　%　was　achieved.　The　RhB　degradation　followed　first‐order　kinetics　and　the　rate　constant　of　g-C3N4/Mn3O4/ZIF-8/PMS　system　was　2.85,　3.09,　9.82　and　17　times　of　g-C3N4,　Mn3O4,　ZIF-8　and　PMS,　respectively.　Moreover,　the　synergistic　effect　of　CMZ　and　PMS　on　the　removal　efficiencies　of　total　organic　carbon　(TOC)　for　RhB　and　wastewater　were　92.84　%　and　96.13　%,　respectively.　After　five　cycles　of　use,　the　degradation　rate　of　the　prepared　catalyst　for　RhB　only　decreased　by　1.7　%.　This　work　provided　new　insights　that　the　synergistic　effect　of　advanced　oxidation　technologies　and　photocatalysis　holds　broad　prospects　for　the　photodegradation　of　RhB.　©　2024　Elsevier　B.V.