In　this　work,　highly　efficient　g-C3N4/Bi4O7　heterojunction　photocatalysts　have　been　successfully　fabricated　by　a　facile　method.　Compared　with　the　bare　photocatalysts,　the　obtained　g-C3N4/Bi4O7　hybrid　photocatalysts　exhibited　efficient　degradation　activity　toward　methylene　blue　(MB),　phenol,　rhodamine　B　(RhB),　and　bisphenol　A　(BPA)　under　visible　light　irradiation.　The　influences　of　different　g-C3N4　contents　on　the　photocatalytic　efficiency　of　the　hybrid　photocatalysts　have　been　investigated.　The　results　revealed　that　the　g-C3N4/Bi4O7　with　g-C3N4　mass　ratio　of　30%　exhibited　the　best　photocatalytic　activity.　The　activity　enhancement　should　be　ascribed　to　the　improved　visible　light　adsorption　as　well　as　the　effective　Z-scheme　charge　transfer　according　to　the　energy　band　theory.　The　UV–vis　diffuse　reflectance　spectra　(DRS)　shows　that　the　absorption　edge　of　g-C3N4　move　towards　longer　wavelength　with　the　increment　of　Bi4O7　component.　The　strong　connection　between　g-C3N4　and　Bi4O7　was　investigated　using　X-ray　powder　diffraction　(XRD),　scanning　electron　microscopy　(SEM),　transmission　electron　microscopy　(TEM),　and　X-ray　photoelectron　spectroscopy　(XPS).　Subsequently,　the　effective　Z-scheme　charge　transfer　has　also　been　verified　by　using　transient　photocurrent　measurements　and　electrochemical　impedance　spectroscopy.　Controlled　experiments　proved　that　active　species　of　O2　-　and　h+　were　produced　in　the　degradation　system,　which　played　the　major　role　in　the　degradation　of　MB.　A　possible　Z-scheme　degradation　mechanism　over　g-C3N4/Bi4O7　hybrid　photocatalysts　was　proposed.　©　2017　Elsevier　Inc.