Graphitic　carbon　nitride　and　its　supported　iron　oxide　(xwt%　Fe2O3/g-C3N4,　x=0.1-0.8)　photocatalysts　were　fabricated　using　the　guanidine　hydrochloride　calcination　and　incipient　wetness　impregnation　methods,　respectively.　The　xwt%　Fe2O3/g-C3N4　photocatalysts　contained　a　two-dimensional　nanosheet　structure　with　high　dispersion　of　Fe2O3　nanoparticles　(2-3　nm　in　size),　a　surface　area　of　27-29　m(2)/g,　and　a　bandgap　energy　of　1.92-2.68　eV.　The　0.5　wt%　Fe2O3/g-C3N4　sample　showed　the　highest　photocatalytic　activity　(90%　4-nitrophenol　(4-NP)　was　degraded　within　40　min　of　visible-light　illumination).　Effects　of　pH　value,　H2O2　amount,　and　initial　4-NP　concentration　on　activity　of　the　typical　sample　were　also　examined.　It　is　concluded　that　the　enhanced　photocatalytic　activity　of　0.5　wt%　Fe2O3/g-C3N4　was　associated　with　its　unique　two-dimensional　layered　structure,　Fe2O3-g-C3N4　heterojunction,　high　surface　oxygen　adsorbed　species　concentration,　and　easy　transfer　and　separation　of　photogenerated　charge　carriers.　(C)　2016　Elsevier　B.V.　All　rights　reserved.