We　present　a　facile　and　environmentally　friendly　way　to　successfully　build　partially　reduced　titanium　dioxide　nanoparticles　integrated　with　reduced　graphene　oxide　composite　nanosheets　(RGO/TiO2−x)　through　an　environmental　solvothermal　method　at　relatively　low　temperature.　The　Ti3+　self-doping　of　TiO2−x　is　conducive　to　enhance　its　visible　light　absorption,　and　the　existence　of　RGO　as　the　electron　receiver　makes　the　electrons　on　TiO2−x　transport　better　to　its　surface,　effectively　promoting　the　separation　of　electrons　and　holes.　Experiments　on　photocatalytic　degradation　of　methylene　blue　dye　and　phenol　colorless　organic　pollutant　by　visible　light　demonstrate　that　the　RGO/TiO2−x　assemblies　exhibit　the　highest　photocatalytic　activity,　and　that　methylene　blue　solution　concentration　of　used　in　the　experiment　is　40　mg　L−1,　which　was　more　higher　than　the　concentration　(10　mg　L−1)　used　in　many　of　reported　articles.　Compared　to　the　pure　TiO2　and　TiO2−x,　the　photodegradation　efficiency　of　methylene　blue　and　phenol　can　be　increased　to　100%　within　120　min　and　150　min　under　visible　light.　Moreover,　the　mineralization　rates　of　MB,　such　as　the　total　organic　carbon　(TOC)　degradation　rate,　can　reach　to　75.7%,　86.6%　and　89.4%　for　m-RGO/TiO2−x,　respectively.　And　the　reaction　efficiency　of　RGO/TiO2−x　is　basically　not　much　changed　after　4th　cycles,　suggesting　its　excellent　photocatalytic　stability.　©　2018　Elsevier　B.V.