Heterogeneous　photocatalysis　offers　a　promising　route　to　realize　green　oxidation　processes　in　organic　synthesis　because　such　selective　organic　transformation　processes　can　be　enabled　under　solar　light　irradiation　with　ambient　conditions.　In　this　research,　graphene-TiO2　nanocomposites　have　been　utilized　for　aerobic　selective　oxidation　of　benzylic　alcohols　to　corresponding　aldehydes　and　acids　in　water　under　simulated　solar　light　irradiation.　The　photocatalytic　performance　and　related　properties　of　solvent　exfoliated　graphene-TiO2　(SEG-TiO2)　and　reduced　graphene　oxide-TiO2　(RGO-TiO2)　have　been　comparatively　studied.　It　has　been　found　that　decreasing　the　defect　density　of　graphene,　by　using　SEG　instead　of　graphene　oxide　(GO)　as　the　precursor　of　RGO,　can　enhance　the　photoactivity　of　graphene-TiO2　nanocomposites　due　to　the　improved　electron　conductivity　of　SEG　as　compared　to　that　of　RGO.　It　is　hoped　that　this　work　would　stimulate　further　interest　in　utilizing　graphene-semiconductor　nanocomposite　photocatalysts　in　the　field　of　green-chemistry-oriented　photocatalytic　selective　organic　transformation.