Graphene-La2Ti2O7　nanocomposites　used　as　photocatalyst　were　prepared　via　a　two-step　process　in　this　paper.　Graphite　oxide　was　firstly　exfoliated　via　thermal　expanding　process　under　1000　degrees　C,　then　the　expanded　graphite　was　reduced　by　La2Ti2O7　nanosheets　under　UV　light　irradiation.　The　as-prepared　graphene-La2Ti2O7　nanocomposites　were　characterized　by　scanning　electron　microscopy　(SEM),　powder　X-ray　diffraction　(XRD),　BET　surface　area　analyzer,　Raman　spectroscopy,　Fourier　transformation　infrared　(FTIR)　spectroscopy　and　UV-vis　diffuse　spectroscopy.　The　composites　exhibited　an　enhanced　photocatalytic　activity　for　decomposition　of　rhodamine　B　(RhB)　under　UV-irradiation　compared　to　pure　La2Ti2O7　materials,　which　was　attributed　to　the　increase　in　the　charge　separation　efficiency　in　the　presence　of　graphene　and　the　large　surface　contact　between　graphene　and　La2Ti2O7.　(C)　2011　Elsevier　B.V.　All　rights　reserved.