Three-dimensionally　ordered　mesoporous　Fe2O3　(meso-Fe2O3)　and　its　supported　Au,　Pd,　and　Au-Pd　alloy　(xAuPdy/meso-Fe2O3;　x　=　0.08-0.72　wt.%;　Pd/Au　molar　ratio　(y)　=　1.48-1.85)　photocatalysts　have　been　prepared　via　the　KIT-6-templating　and　polyvinyl　alcohol-protected　reduction　routes,　respectively.　Physical　properties　of　the　samples　were　characterized,　and　their　photocatalytic　activities　were　evaluated　for　the　photocatalytic　oxidation　of　acetone　in　the　presence　of　a　small　amount　of　H2O2　under　visible-light　illumination.　It　was　found　that　the　meso-Fe2O3　was　rhombohedral　in　crystal　structure.　The　as-obtained　samples　displayed　a　high　surface　area　of　111.0-140.8　m(2)/g　and　a　bandgap　energy　of　1.98-2.12　eV.　The　Au,　Pd　and/or　Au-Pd　alloy　nanoparticles　(NPs)　with　a　size　of　3-4　nm　were　uniformly　dispersed　on　the　surface　of　the　meso-Fe2O3　support.　The　0.72　wt.%　AuPd1.48/meso-Fe2O3　sample　performed　the　best　in　the　presence　of　0.06　mol/L　H2O2　aqueous　solution,　showing　a　100%　acetone　conversion　within　4　hr　of　visible-light　illumination.　It　was　concluded　that　the　good　performance　of　0.72　wt.%　AuPd1.48/meso-Fe2O3　for　photocatalytic　acetone　oxidation　was　associated　with　its　ordered　mesoporous　structure,　high　adsorbed　oxygen　species　concentration,　plasmonic　resonance　effect　between　AuPd　1.48　NPs　and　meso-Fe2O3,　and　effective　separation　of　the　photogenerated　charge　carriers.　In　addition,　the　introduction　ofH(2)O(2)　and　the　involvement　of　the　photo-Fenton　process　also　played　important　roles　in　enhancing　the　photocatalytic　activity　of　0.72　wt.%　AuPd1.48/meso-Fe2O3.　(C)　2017　The　Research　Center　for　Eco-Environmental　Sciences,　Chinese　Academy　of　Sciences.　Published　by　Elsevier　B.　V.