Ultralight and highly compressible coal oxide-modified graphene aerogels for organic solvents absorption and light-to-heat conversion
The fabrication of economical and multifunctional graphene aerogel with excellent physicochemical properties is still a challenge. Herein, we prepared ultralight, highly elastic graphene/coal oxide (GC) aerogels with low-cost and simple routes, in which coal oxide was firstly introduced in the skeleton of graphene aerogels to prevent the serious stacking of graphene nanosheets. After chemical grafting of the long carbon chains, the modified graphene/coal oxide (MGC) aerogels exhibited excellent hydrophobicity (140o). The ultralight MGC showed outstanding compression performance, recovering 100% with the compressive strain of 95% in a dry environment. Meanwhile, the moderate amount of coal oxide could improve the aerogel with high adsorption capacity (196 times). Moreover, the super-absorption capacity was up to 387 times its own mass by further carbonation treatment. Furthermore, the obtained MGC exhibited excellent adsorption reusability in absorption/combustion cycles. Additionally, the MGC can be used as an interfacial solar vapor evaporator with efficiency of 86% under 1 sun. On the bases of the viable synthesis method, the ultralight and compressive aerogels have promising applications in organic pollution cleanup and solar steam generation.