Visible-light-initiated　organic　transformations　have　received　much　attention　because　of　low　cost,　relative　safety,　and　environmental　friendliness.　In　this　work,　a　series　of　CdS-decorated　MIL-68(Fe)　nanocomposites　(CdS-M68　NCs)　have　been　prepared　via　a　facile　room-temperature　photodeposition　technique　in　a　controlled　manner.　Importantly,　the　CdS-M68　NCs　exhibit　remarkably　enhanced　photoactivity　toward　selective　reduction　of　4-nitroaniline　(4-NA)　to　p-phenylenediamine　(PPD)　in　water　under　visible　light　irradiation　(λ ≥ 420 nm)　as　compared　to　bare　CdS　and　MIL-68(Fe),　giving　a　4-NA　conversion　of　∼100%　after　irradiation　for　8 min.　The　significantly　enhanced　photoactivity　is　attributed　to　the　integrated　factors　of　the　effective　transportation　of　the　photogenerated　electron-hole　pairs　and　the　enhanced　visible　light　absorption　intensity.　Combining　with　trapping　experiments　and　ESR　analysis,　it　could　be　revealed　that　the　photoexcited　electrons　and　[rad]CO2−　radicals　should　be　the　main　active　species　in　the　present　system.　In　addition,　a　possible　photocatalytic　reduction　mechanism　has　been　investigated.　©　2017　Elsevier　B.V.