Bi3O4Cl/BiOCl　(B3O4C/BOC)　heterojunction　photocatalyst　with　high　visible-light　photocatalytic　activity　was　synthesized　by　one-pot　hydrothermal　method.　The　morphology,　crystal,　structure,　optical　and　photo　catalytic　property　of　the　synthesized　samples　were　characterized　by　XRD,　SEM,　HRTEM,　EDX,　BET,　UV-vis　DRS,　photocurrent,　PL,　and　etc.　The　B3O4C/BOC　heterojunction　photocatalyst　exhibited　higher　photocatalytic　activity　than　pure　BiOCl　(BOC)　and　Bi3O4Cl　(B3O4C)　for　the　degradation　of　Orange　II　under　visible　light　(lambda　＞=　420　nm).　The　0.50B(3)O(4)C/BOC-1　heterojunction　exhibited　the　highest　photocatalytic　activity　and　its　photocatalytic　efficiency　was　4.4-fold　more　than　those　of　pure　BOC.　In　addition,　the　0.50B(3)O(4)C/BOC-1　synthesized　by　one-pot　hydrothermal　method　exhibited　higher　photocatalytic　activity　than　that　prepared　by　two-step　traditional　synthesis　method.　The　enhanced　photocatalytic　activity　of　the　B3O4C/BOC　heterostructure　photocatalyst　was　predominantly　attributed　to　the　efficient　separation　of　photoinduced　electrons　and　holes.　Ultimately,　the　results　also　reveal　that　(OH)-O-center　dot　and　center　dot　O2-　radicals　are　primarily　reactive　species　in　the　photocatalytic　system,　which　are　the　key　factors　responsible　for　the　nearly　complete　mineralization　of　Orange　II.　(C)　2015　Elsevier　B.V.　All　rights　reserved.