Abstract:
Superhydrophobic and superoleophilic graphene (GE)/formaldehyde-melamine-sodium (FMS) bisulfite copolymer sponge was synthesized by a two-step method, first polymerize GE on the sponge substrate, followed by surface modification with polymethylphenyl silicone to take advantage of its adhesion force in an effort to enhance the hydrophobicity of the FMS sponge absorbent. The modified GE/FMS sponge was characterized by FTIR, SEM, TGA and water contact angle measurement. The results show that the fabricated GE/FMS copolymer sponge is successfully embellished with GE, with a water contact angle of 158.9° after functionalization. The modified GE/FMS sponge exhibits excellent oil-water and organic solvent-water separation with stable superhydrophobic properties maintained after 20 times of absorption-desorption engine oil. The sponge sorbent displays a high sorption capacity with chloroform and engine oil for the modified GE/FMS sponge amounted to about 125 times and 90 times its own weight respectively. The GE/FMS sponge can also separate oil or organic solvent from water efficiently from simulated separation process. The GE/FMS sponge sorbent shows a recovery rate of greater than 87% for the absorption of oils and organic solvents tested. Further, the separation of oil or organic solvent was simulated, overall the newly developed GE/FMS sponge shows much better performance in terms of sorption capacity, recovery rate and reusability, which makes the GE/FMS sponge a promising sorbent for potential applications in the separation and recovery of spilled oils from water.