A　facile　strategy　was　adopted　to　prepare　porous　Cd0.5Zn0.5S　(CZS-X)　nanocages　by　sulfurizing　the　rhombic　dodecahedral　ZIF-8　as　precursor　with　thioacetamide　(TAA)　at　different　durations　(0,　1,　3,　5　h),　in　which　the　fabrication　mechanism　of　the　porous　CZS-X　nanocages　was　clarified.　The　photocatalytic　activities　of　CZS-X　for　Cr(VI)　elimination　and　organic　pollutant　decomposition　were　assessed.　The　results　revealed　that　CZS-3　exhibited　optimal　photocatalytic　activity　under　visible　light　along　with　satisfied　recyclability　and　stability　after　several　runs＇　operation.　As　well,　the　CZS-3＇s　photocatalytic　cleanup　abilities　toward　both　Cr(VI)　and　organic　pollutants　were　explored　in　different　actual　water　bodies　to　clarify　the　influence　of　different　foreign　ions.　Finally,　the　intrinsic　photocatalysis　mechanism　of　CZS-X　was　verified.