Preparation of graphene sponge materials and their photothermal evaporation performance
Graphene has shown great potential in the field of solar-driven interfacial evaporation.However,many limits still exist for its application such as high cost and complex preparation methods.To address this issue,reduced graphene oxide/melamine sponge(RGO/MS)bilayer composite material was prepared by combining reduced graphene oxide(RGO)with strong hydrophilic melamine sponge(MS).The effects of RGO loading method,total MS height and sponge porosity on photothermal evaporation rate were explored.The optimum preparation conditions of RGO/MS were obtained,i.e.,MS height being 12mm and the porosity being 99.8％by drip casting method.Under the illumination of light(1.0kW/m2),the evaporation rate can reach 2.441kg/(m2·h).The results showed that the prepared material exhibited stable mechanical properties.A uniform layer of RGO was successfully deposited on the surface of MS.Good continuous usage performance in artificial seawater was observed.The preparation process of RGO/MS composite materials was simply,reducing costs and effectively improving its evaporation performance,which was promising to be used in the field of seawater purification.
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