Hierarchical　BiOCl　microflowers　have　been　synthesized　by　one-step　solvothermal　method,　which　are　constructed　from　many　thin　nanosheets　by　exposing　the　highly　active　highly　active　{001}　facets.　Considering　the　wide　band　gap　of　BiOCl　microflowers　(3.4eV),　the　amorphous　Fe(III)　clusters　were　grafted　on　the　surfaces　through　a　simple　impregnation　method　to　extend　the　photocatalytic　activity　to　the　visible　light　region.　The　obtained　products　were　characterized　by　X-ray　diffraction,　scanning　electron　and　transmission　microscopy,　X-ray　photoelectron　spectroscopy,　UV-vis　diffuse　reflectance　spectroscopy,　nitrogen　adsorption-desorption,　and　electrochemical　measurements.　It　is　found　that　the　Fe(III)　clusters　are　just　deposited　on　the　surfaces　rather　than　doped　in　the　lattices　of　BiOCl.　The　morphologies　and　crystal　structures　of　BiOCl　microflowers　thus　remain　unchanged　after　modification　of　Fe(III)　clusters.　The　photocatalytic　activity　for　the　decomposition　gaseous　acetaldehyde　can　be　significantly　improved　by　the　modification　of　Fe(III)　clusters　under　visible　light　irradiation.　The　surface　Fe(III)　clusters　play　an　important　role　in　the　interfacial　charge　transfer　for　the　visible　light　absorption.　Furthermore,　together　with　the　strong　oxidative　holes　in　the　valence　band　of　BiOCl,　the　Fe(III)　clusters　can　serves　as　the　redox　reaction　centers　for　the　multi-electron　reduction　of　oxygen　molecules,　resulting　in　the　full　decomposition　of　acetaldehyde　into　CO2.　©　2015　Elsevier　B.V.