Figure 4

Underwater oil contact angles of (a) diesel, (b) gasoline and (c) sunflower oil for the ZnO-NRs/CC membrane with the hydrothermal reaction duration of 24 h.

Underwater oil contact angles of (a) diesel, (b) gasoline and (c) sunflower oil for the ZnO-NRs/CC membrane with the hydrothermal reaction duration of 24 h.