A　systematic　comparison　between　graphene　(GR)-semiconductor　CdS　and　its　analogs　fullerene　(C-60)　and　carbon　nanotube　(CNT)-semiconductor　CdS　composite　photocatalysts　for　selective　oxidation　of　alcohols　has　been　carried　out　based　on　a　reasonable　benchmark　framework.　The　results　reveal　that　GR　cannot　manifest　its　unique　advantage　over　its　carbon　allotropes　in　enhancing　the　photoactivity　of　semiconductor　CdS.　The　primary　roles　of　these　carbon　allotropes　(C-60,　CNT,　and　GR)　are　found　to　be　quite　similar　in　terms　of　structure-photoactivity　correlation　analysis.　Overall,　this　work　highlights　that　(i)　the　exponential　increase　in　publications　on　GR-semiconductor　photocatalysts　has　not　been　matched　by　increases　in　our　knowledge　regarding　the　similarity　and　difference　of　these　carbon　allotropes　in　relation　to　improving　the　photocatalytic　performance　of　semiconductors;　(ii)　efforts　should　be　more　rationally　focused　on　how　to　make　the　best　use　of　remarkable　properties　of　GR　in　designing　more　efficient　GR-based　semiconductor　composite　photocatalysts,　thereby　advancing　the　sufficient　realization　of　GR＇s　potential　in　constructing　efficient　GR-semiconductor　photocatalysts　for　solar　energy　conversion.　(C)　2012　Elsevier　Inc.　All　rights　reserved.