Abstract:

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.

Key words: graphene, evaporation, photothermal evaporation rate, voidage, sustainability

摘要：

石墨烯在太阳能界面蒸发领域显示出巨大的应用潜力，但其应用仍存在成本高、制备复杂等诸多限制。为了解决这一问题，将吸光性能优异的石墨烯（RGO）与强亲水性的三聚氰胺海绵（MS）结合，制备了石墨烯/三聚氰胺海绵（RGO/MS）双层复合材料，考察了石墨烯负载方法、MS高度、海绵孔隙率对水蒸发速率的影响。当采用滴铸法负载RGO、MS高度为12mm、孔隙率为99.8%时制备的RGO/MS复合材料光热水蒸发效果最佳。在1.0kW/m²条件下，RGO/MS复合材料的水蒸发速率可达2.441kg/(m²·h)。研究结果表明：RGO/MS复合材料具有稳定的机械性能，RGO分布均匀，在光热蒸发人工海水中表现出良好的连续使用性能。RGO/MS复合材料制备工艺简单，材料成本低，有望用于净化海水领域。

关键词: 石墨烯, 蒸发, 光热蒸发速率, 空隙率, 可持续性