Using　impregnation　technique,　a　small　amount　of　Rh(III)　clusters　has　been　grafted　on　the　BiOCl　microflowers.　The　samples　are　characterized　by　X-ray　diffraction,　scanning　electron　microscopy　coupled　with　high　energy　distribution　X-ray,　transmission　electron　microscopy,　X-ray　photoelectron　spectroscopy,　and　UV–vis　diffuse　reflectance　spectroscopy.　The　photocatalytic　activities　are　investigated　by　the　decomposition　of　gaseous　acetaldehyde　under　irradiation　of　visible　light.　The　bare　BiOCl　microflowers　exhibit　the　limited　visible　light　photocatalytic　activity　because　of　its　wide　band　gap.　After　surface　modification　of　Rh(III)　clusters,　the　Rh(III)-BiOCl　samples　show　an　enhanced　photocatalytic　activity　for　the　decomposition　gaseous　acetaldehyde　under　visible　light　irradiation.　It　is　found　that　the　Rh(III)　clusters　play　an　important　role　for　the　visible　light　absorption,　probably　through　the　electron　transfer　between　Rh(III)　clusters　and　the　BiOCl,　as　well　as　the　redox　reaction　centers　for　the　multi-electron　reduction　of　O　2　.　©　2016　Elsevier　B.V.