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-C3N4　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.　©　2016　Elsevier　B.V.　All　rights　reserved.