In　this　study,　hybrid　nanocomposites　based　on　Fe-based　MOF　and　graphitic　carbon　nitride　(g-C3N4)　were　developed　by　a　facile　solvothermal　method.　The　as-prepared　materials　were　characterized　by　XRD,　FESEM,　TEM,　XPS　and　PL　analysis.　It　was　showed　that　the　introduction　of　a　certain　amount　of　g-C3N4　on　the　surface　of　MIL-53(Fe)　would　improve　the　separation　and　migration　rate　of　photo-induced　charges,　consequently　resulting　in　the　boost　of　photocatalytic　efficiency.　Compared　with　g-C3N4　and　MIL-53(Fe),　the　CMFe　composites　displayed　more　excellent　visible　light-resposive　photocatalytic　activity　for　the　reduction　of　Cr(VI).　The　optimal　doping　content　of　g-C3N4　in　g-C3N4/MIL-53(Fe)　composite　was　determined　to　be　3.0　wt%,　and　it　showed　about　2.1　and　2.0　times　as　high　photocatalytic　efficiency　for　the　reduction　of　Cr(VI)　as　that　of　pure　g-C3N4　and　MIL-53(Fe),　respectively.　Meanwhile,　the　composite　exhibited　good　reusability　and　stability　in　the　process　of　cyclic　experiments.　A　possible　photocatalytic　reaction　mechanism　was　also　investigated　in　detail　by　the　related　electrochemical　analysis.　(C)　2017　Elsevier　B.V.　All　rights　reserved.