Carbon　dioxide　(CO2)　extent　in　the　atmosphere　has　gradually　increased　because　of　excessive　activities　such　as　burning　fossil　fuels　and　deforestation.　Converting　CO2　into　value-added　hydrocarbon　fuels　over　semiconductors　by　using　solar　energy　is　thus　essential　to　reduce　the　greenhouse　effect.　In　this　study,　novel　hierarchical　graphene–Zn0.5Cd0.5S　(xG-ZCS)　nanocomposites　were　constructed　through　a　straight　forward　dual-step　hydrothermal　approach　at　180　°C.　The　prepared　composites　exhibited　enhanced　visible-light　photocatalytic　transformation　of　CO2　to　methanol　(CH3OH).　The　2G-ZCS　(2　wt%　graphene-Zn0.5Cd0.5S)　composite　produced　the　highest　amount　of　CH3OH　(approximately　1.96　μmol　g−1　h−1),　that　is　almost　98　times　greater　than　pure　ZCS　nanospheres　(Zn0.5Cd0.5S).　The　increased　photocatalytic　CO2　reduction　could　be　as　a　result　of　graphene,　which　served　as　an　exceptional　electron　receiver　and　carrier,　sinking　the　reconsolidation　of　charge　mobility　and　enhance　the　catalytic　property.　The　electrochemical　impedance　spectroscopy　and　transient　photocurrent　analysis　was　analyzed　to　demonstrate　the　proposed　photocatalysis　mechanism.　©　2019　Elsevier　B.V.