Electron-hole　recombination　and　the　narrow-range　utilization　of　sunlight　limit　the　photocatalytic　efficiency　of　titanium　oxide　(TiO2).　We　synthesized　carbon　dots　(CDs)　and　modified　TiO2　nanoparticles　(NPs)　with　a　flower-like　mesoporous　structure,　i.e.,　porous　TiO2/CDs　nanoflowers.　Among　such　hybrid　particles,　the　CDs　worked　as　photosensitizers　for　the　mesoporous　TiO2　and　enabled　the　resultant　TiO2/CDs　nanoflowers　with　a　wide-range　light　absorption.　Rhodamine　B　(Rh-B)　was　employed　as　a　model　organic　pollutant　to　investigate　the　photocatalytic　activity　of　the　TiO2/CDs　nanoflowers.　The　results　demonstrated　that　the　decoration　of　the　CDs　on　both　the　TiO2　nanoflowers　and　the　(commercially　available　AEROXIDE　TiO2)　P25　NPs　enabled　a　significant　improvement　in　the　photocatalytic　degradation　efficiency　compared　with　the　pristine　TiO2.　The　TiO2/CDs　nanoflowers,　with　their　porous　structure　and　larger　surface　areas　compared　to　P25,　showed　a　higher　efficiency　to　prevent　local　aggregation　of　carbon　materials.　All　of　the　results　revealed　that　the　introduced　CDs,　with　the　unique　mesoporous　structure,　large　surface　areas　and　loads　of　pore　channels　of　the　prepared　TiO2　NPs,　played　important　roles　in　the　enhancement　of　the　photocatalytic　efficiency　of　the　TiO2/CDs　hybrid　nanoflowers.