In　this　study,　we　provide　a　seed-induced　solvothermal　method　to　grow　various　TiO2　nanostructures　on　the　surfaces　of　g-C3N4,　such　as　0D　nanoparticles,　1D　nanowires　2D　nanosheets　and　3D　mesoporous　nanocrystals.　We　show　that　the　＂seeding＂　endows　g-C3N4　with　anchoring　sites　toward　the　heterogeneous　nucleation　growth　of　TiO2,　and　the　distribution　of　the　loaded　TiO2　can　be　controlled　by　tuning　the　amount　of　nucleation　in　the　dispersion.　Among　synthesized　nanostructures,　seed-grown　Meso-TiO2/g-C-3　N-4　hybrids　exhibit　the　highest　photocatalytic　activity　upon　visible　light　irradiation　using　methyl　orange　and　phenol　as　probe　organics,　which　are　about　2-4　times　and　29-37　times　as　high　as　those　of　direct-grown　Meso-TiO2/g-C3N4　without　seeding　and　bare　g-C3N4　for　degradation　of　MO　and　phenol,　respectively.　The　enhancement　of　photocatalysis　can　be　ascribed　to　the　adequate　separation　of　photogenerated　electrons　at　the　heterojunction　interfaces　and　dominant　contribution　of　photoinduced　holes　mainly　caused　by　the　well-constructed　nano-　architectures.　(C)　2015　Elsevier　B.V.　All　rights　reserved.