Graphite-like　carbon　nitride　(g-C3N4)　displays　strong　potential　applications　in　visible-light　photocatalytic　for　water　treatment,　but　its　applications　are　greatly　restricted　by　high　recombination　probability　of　photo-generated　electron-hole　pairs,　as　well　as　a　weak　reduction　ability　toward　the　heavy　metals.　In　this　work,　we　reported　the　synthesis　of　nZVI-g-C3N4　nano-hybrid　with　highly　efficiency　toward　the　photodegradation　of　RhB　and　Cr(VI)　under　the　visible　light　irradiation.　The　nZVI　nanoparticles　can　well　be　immobilized　and　dispersed　on　the　surface　of　g-C3N4　nanosheets　by　a　facile　borohydride-reduction　method.　As-synthesized　nZVI-g-C3N4　has　an　improved　photocatalytic　activity　much　better　than　that　of　the　pure　g-C3N4,　wherein　over　92.9%　of　Cr(VI)　and　99.9%　of　RhB　can　be　removed　by　using　nZVI-g-C3N4　.　The　nZVI　particles　not　only　contributes　to　the　reduction　and　immobilization　of　Cr(VI),　but　also　accelerates　the　photocatalytic　degradation　efficiency　of　RhB　due　to　a　lower　recombination　rate　of　photoexcited　holes　and　electrons.　Moreover,　nZVI-g-C(3)N(4)preserves　superior　photodegradation　efficiency　after　five　experimental　cycles.　It　can　be　attributed　that　nZVI-g-C3N4　photocatalyst　is　chemically　stable,　and　part　of　nZVI　can　be　recovered　by　g-C3N4.　We　believe　that,　the　composite　of　nZVI-g-C3N4　reported　here　could　provide　guidance　for　the　design　of　efficient　and　reusable　materials　to　remove　both　the　organic　compounds　and　heavy　metal　ions　from　waste　waters.　(C)　2016　Elsevier　B.V.　All　rights　reserved.