Metal-organic　framework　MIL-100(Fe)　and　g-C3N4　heterojunctions　(MG-x,　x　=　5%,　10%,　20%,　and　30%,　x　is　the　mass　fraction　of　MIL-100(Fe)　in　the　hybrids)　were　facilely　fabricated　through　ball-milling　and　annealing,　and　characterized　by　powder　X-ray　diffraction,　Fourier　transform　infrared　spectroscopy,　thermogravimetric　analysis,　transmission　electron　microscopy,　UV-visible　diffuse-reflectance　spectrometry,　and　photoluminescence　emission　spectrometry.　The　photocatalytic　activities　of　the　series　of　MG-x　heterojunctions　toward　Cr(VI)　reduction　and　diclofenac　sodium　degradation　were　tested　upon　irradiation　with　simulated　sunlight.　The　influence　of　different　organic　compounds　(ethanol,　citric　acid,　oxalic　acid,　and　diclofenac　sodium)　as　hole　scavengers　and　the　pH　values　(2,　3,　4,　6,　and　8)　on　the　photocatalytic　activities　of　the　series　of　MG-x　heterojunctions　was　investigated.　MG-20%　showed　superior　photocatalytic　Cr(VI)　reduction　and　diclofenac　sodium　degradation　performance　than　did　the　individual　MIL-100(Fe)　and　g-C3N4　because　of　the　improved　separation　of　photoinduced　electron-hole　charges,　which　was　clarified　via　photoluminescence　emission　and　electrochemical　data.　Moreover,　the　MG-x　exhibited　good　reusability　and　stability　after　several　runs.　(C)　2019,　Dalian　Institute　of　Chemical　Physics,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.V.　All　rights　reserved.