Three　environmentally　friendly　Z-scheme　CoPc/alkali　metal-doped　g-C3N4　heterojunction　composites　were　fabricated　via　in-situ　immobilizing　cobalt　phthalocyanine　(CoPc)　on　the　surface　of　alkali　metal-doped　g-C3N4　nanosheet　by　simple　hydrothermal　method.　These　composites　acted　as　efficient　and　recyclable　heterogeneous　photocatalysts　realized　that　the　highly　selective　aerobic　oxidation　of　amines　to　the　corresponding　imines　coupling　of　hydrogen　peroxide　generation　at　room　temperature.　Under　irradiation　by　LED　lamp,　the　imines　and　H2O2　were　obtained　with　conversion　ranges　from　87.9　%　to　92.0　%,　selectivity　more　than　99　%,　and　production　rate　ranges　from　3.27　to　3.40　mmol　g−1　h−1,　respectively.　Based　on　the　mechanistic　analysis　and　characterization,　the　excellent　catalytic　activity　derived　from　the　Z-scheme　mechanic　and　synergistic　effect　originated　from　O2　reduction　and　amine　oxidation.　On　completion,　after　centrifugation,　washing　with　solvent　and　drying　under　vacuum,　the　catalysts　can　be　recovered　and　reused　for　five　successive　cycles　of　testing　with　a　slight　decrease　in　reactivity.　For　this　work,　a　promising　photo　synthesis　pathway　with　merits　of　mild,　low-cost,　pollution-free,　and　energy-saving　was　developed　to　produce　imines　coupling　with　H2O2　generation.　©　2024　Elsevier　B.V.