Proper　design　and　preparation　of　high-performance　and　stable　dual　functional　photocatalytic　materials　remains　a　significant　objective　of　research.　In　this　work,　highly　dispersed　noble-metal　nanoparticles　(Au,　Pd,　Pt)　were　immobilized　on　MIL-100(Fe)　(denoted　M@MIL-100(Fe))　using　a　facile　room-temperature　photodeposition　technique.　The　resulting　M@MIL-100(Fe)　(M　=　Au,　Pd,　and　Pt)　nanocomposites　exhibited　enhanced　photoactivities　toward　photocatalytic　degradation　of　methyl　orange　(MO)　and　reduction　of　heavy-metal　Cr(VI)　ions　under　visible-light　irradiation　(λ　≥　420　nm)　compared　with　blank-MIL-100(Fe).　Combining　these　results　with　photoelectrochemical　analyses　revealed　that　noble-metal　deposition　can　effectively　improve　the　charge-separation　efficiency　of　MIL-100(Fe)　under　visible-light　irradiation.　This　phenomenon　in　turn　leads　to　the　enhancement　of　visible-light-driven　photoactivity　of　M@MIL-100(Fe)　toward　photocatalytic　redox　reactions.　In　particular,　the　Pt@MIL-100(Fe)　with　an　average　Pt　particle　size　of　2　nm　exhibited　remarkably　enhanced　photoactivities　compared　with　those　of　M@MIL-100(Fe)　(M　=　Au　and　Pd),　which　can　be　attributed　to　the　integrative　effect　of　the　enhanced　light　absorption　intensity　and　more　efficient　separation　of　the　photogenerated　charge　carrier.　In　addition,　possible　photocatalytic　reaction　mechanisms　are　also　proposed.　[Figure　not　available:　see　fulltext.]　©　2015,　Tsinghua　University　Press　and　Springer-Verlag　Berlin　Heidelberg.