Graphitic　carbon　nitride　(g-C3N4)　nanocrystals　(NCs)　decorated　Ag3PO4　hybrids　were　synthesized　by　a　facile　method.　The　obtained　samples　were　characterized　by　X-ray　diffraction　(XRD),　X-ray　photoelectron　spectroscopy　(XPS),　scanning　electron　microscope　(SEM),　transmission　electron　microscope　(TEM),　and　UV–vis　diffuse　reflectance　spectra　(DRS).　The　SEM　and　TEM　images　showed　that　the　as-prepared　Ag3PO4　were　composed　of　particles　with　diameters　of　200–500 nm,　while　the　obtained　nanocrystalline　g-C3N4　were　composed　of　smaller　particles　with　average　diameter　of　10 nm.　For　nanocrystalline　g-C3N4/Ag3PO4　hybrids,　the　particle　surfaces　of　Ag3PO4　were　decorated　with　numerous　g-C3N4　NCs,　result　in　a　larger　contact　area　between　g-C3N4　and　Ag3PO4.　The　photocatalytic　performances　were　evaluated　by　decomposing　MO,　phenol,　bisphenol　A,　and　RhB　under　visible　light.　Compared　with　Ag3PO4　and　g-C3N4,　the　g-C3N4/Ag3PO4　hybrid　(mass　ratio = 1:4)　exhibited　the　best　activity,　which　was　much　higher　than　that　of　bulk-g-C3N4/Ag3PO4　composite　under　the　same　conditions.　The　enhanced　activities　should　be　mainly　ascribed　to　the　enhanced　separation　efficiency　of　photo-generated　carriers,　which　was　proved　by　the　photoluminescence　(PL)　spectra　measurement.　Controlled　experiments　proved　that　[rad]O2−　and　h+　played　the　chief　role　in　the　degradation　process.　A　possible　Z-scheme　degradation　mechanism　of　organic　contaminant　over　g-C3N4/Ag3PO4　hybrid　was　proposed.　©　2017