▎ 摘　　要

The quaternary N in N-doped graphene-Fe2O3 nanocomposites could be very favorable for the transfer and transportation of photo-generated charges and for the adsorption of CO2 and O-2 so as to greatly enhance the charge separation, leading to the obviously-improved photoactivities for CO2 reduction to selectively evolve CO and for acetaldehyde degradation.