Simple fabrication of multi-functional melamine sponges

A highly hydrophobic melamine sponge with outstanding magnetic response and fire resistance has been fabricated by a simple two-step method including spontaneous deposit of Fe3O4 nanoparticles onto the sponge and dip coating of lignin. The obtained sponge, combining excellent self-cleaning, compressibility with high porosity, can be magnetically driven to absorb the oils from polluted water. The oil-absorbed sponges can also release the oil by squeezing method. Moreover, the oil can be collected uninterruptedly through the hydrophobic sponges with the assistance of constant-flow pumps. (C) 2016 Elsevier B.V. All rights reserved.