Modification of Melamine and Polyurethane Sponges with Vinyl Triethoxysilane‐Graphene Nanocomposite as Superhydrophobic Absorbents for Oil‐Water Separation

Abstract Oil‐water separation is essential for various industrial and environmental applications. This study explores the potential of commercially available melamine and polyurethane sponges modified with a vinyl triethoxysilane‐graphene nanocomposite as highly efficient oil‐absorbent materials. The textural properties of the modified commercial sponges were studied using various characterization techniques. After modification, the hydrophilicity of raw polyurethane and melamine foam becomes hydrophobic and superhydrophobic with contact angles of 146.93° and 153.63°, respectively. The maximum oil/organic solvent absorption capacity of modified melamine foam was 100 times more than its weight, and that of modified polyurethane foam was 95 g/g. The synthesized foams' physical stability was evaluated by subjecting it to ultrasonic waves for 5 h. They also showed good physical and chemical stability and recycling ability after 15 times, repeating the absorption–squeezing process.