The　construction　of　natural　photosynthesis-inspired　Z-scheme　tandem　system　has　been　considered　as　a　promising　strategy　to　fulfill　efficient　electron-hole　separation　and　charge　transportation　in　composite　photocatalysts,　providing　a　unique　opportunity　to　achieve　improved　solar-driven　photocatalytic　water　splitting　performance　superior　to　conventional　heterojunctions.　The　presence　of　an　ideal　electron　mediator　is　critical　to　promote　effective　electron　transfer　in　Z-scheme　semiconductor　photocatalytic　systems.　Herein,　for　the　first　time,　we　report　the　fabrication　of　CeVO4/three-dimensional　(3D)　reduced　graphene　oxide　(RGO)　aerogel/BiVO4　ternary　composites　and　their　use　as　photocatalysts　for　visible-light-driven　water　oxidation　and　tetracycline　(TC)　degradation.　As-prepared　hybrid　materials　exhibit　well-organized　heterostructures　where　two　vanadates　with　different　dimensional　features　are　surrounded　by　3D　aerogel　networks.　Under　visible　light　irradiation,　the　optimal　composite　material　revealed　highly　improved　photocatalytic　activity　both　in　oxygen　evolution　from　water　splitting　and　TC　degradation.　The　enhancement　in　photocatalytic　efficiency　is　assumed　to　come　from　illuminated　Z-scheme　CeVO4/3D　RGO/BiVO4　configuration,　in　which　conductive　3D　RGO　aerogel　functions　as　an　effective　electron　mediator　and　builds　the　bridge　between　two　vanadates,　offering　a　tandem　channel　for　more　efficient　charge　transfer　in　two　semiconductors.　This　work　may　provide　a　new　clue　for　the　design　of　all-solid-state　Z-scheme　composite　photocatalytic　materials　in　energy　and　environmental　applications.