Figure 6. Schematic images of the states of water molecules on graphene with different surface and their influences on phenanthrene adsorption.

(a) On the plane of graphene nanosheets. (b) On the plane of reduced graphene oxide. (c) On the plane of graphene oxide. Note that the water microdroplets formed via non-H bonds can be replaced by phenanthrene molecules, which contributed to the excellent adsorption of graphene nanosheets besides the hydrophobic effect and π -π interactions.