Synthesis of a Superhydrophobic Polyvinyl Alcohol Sponge Using Water as the Only Solvent for Continuous Oil-Water Separation

Figure 6

Water (colored blue) and oil (colored red) dropped onto the surface of pure PVA sponge (a) and the silylated PVA sponge (b). WCAs of pure PVA sponge (c) and the silylated PVA sponge (d). Plant oil is colored red with Sudan III and water is colored blue with Methyl blue in advance, respectively.