Bismuth　oxybromide/oxyiodide　(Bi4O5BrxI2-x)　photocatalysts　were　successfully　fabricated　using　a　facile　homogeneous　precipitation　method　at　room　temperature.　The　obtained　Bi4O5BrxI2-x　demonstrated　highly　enhanced　visible-light　performances　compared　with　Bi4O5Br2　and　Bi4O5I2.　The　poducts　were　characterized　by　X-ray　diffraction　(XRD),　UV–vis　diffuse　reflectance　spectra　(DRS),　X-ray　photoelectron　spectroscopy　(XPS),　scanning　electron　microscope　(SEM),　and　transmission　electron　microscope　(TEM).　The　DRS　analysis　shows　that　the　band　gap　structures　of　Bi4O5BrxI2-x　have　been　gradually　modulated　by　changing　the　Br/I　molar　ratio.　The　obtained　Bi4O5BrxI2-x　samples　have　exhibited　efficient　photocatalytic　activities　in　decomposing　resorcinol,　o-phenylphenol,　and　4-tert-butylphenol.　The　Br/I　molar　ratio　has　great　influence　on　the　activity　of　the　photocatalysts,　and　Bi4O5Br0.6I1.4　exhibited　the　best　activity　which　was　about　2.77　and　1.80　times　higher　than　that　of　Bi4O5Br2　and　Bi4O5I2,　respectively.　The　degradation　intermediates　were　identified　by　liquid　chromatography-mass　spectrometry　(LC–MS),　and　the　possible　degradation　pathway　of　resorcinol　over　Bi4O5BrxI2-x　photocatalysts　was　proposed.　The　strong　visible　light　absorption,　high　charge　separation　efficiency,　and　proper　band　potentials　should　be　responsible　for　the　excellent　activity　of　Bi4O5BrxI2-x　photocatalyst.　Trapping　experiments　using　radical　scavengers　confirmed　the　generation　of　[rad]O2−,　[rad]OH,　and　h+,　but　only　[rad]O2−　and　h+　have　played　the　chief　role　in　removing　organic　pollutants　from　water.　©　2018