Reduced graphene oxide/iron-based metal–organic framework nano-coating created on flexible polyurethane foam by layer-by-layer assembly: Enhanced smoke suppression and oil adsorption property

Abstract

A large amount of smoke release is a significant fire risk in the combustion of flexible polyurethane (FPU) foam, thus smoke suppression should be considered. Moreover, FPU foam is considered as a promising oil–water separation material, but its hydrophilicity and poor selectivity limit the oil adsorption performance. In this work, reduced graphene oxide and iron-based metal–organic framework were employed to modify FPU foam by layer-by-layer assembly and hydrazine hydrate vapor reduction to enhance its smoke suppression and oil adsorption property. The cone calorimeter results indicate that the peak smoke production rate and total smoke production of modified FPU foams are greatly reduced by the assembly nano-coating on the foam surface. Meanwhile, the oil adsorption experiments show that the coated foam possesses high oil adsorption capacity, repeatability and oil–water selectivity and still maintains its adsorption capacity even after 10 cycles. This work provides a new strategy to solving the problem that FPU foam produces lots of toxic smoke during the combustion and prepares a functional adsorption material for oil–water separation.