Solar-driven interfacial evaporation has attracted much attention owing to its potential for addressing the shortage of freshwater. Low-cost and high-efficiency photothermal conversion materials are the key to the application. A low-cost lotus leaf-based carbon film (LLC) for use as a photo-to-heat conversion medium for solar-driven steam generation was prepared by the simple vacuum filtration of LLC obtained at a carbonization temperature of 800 ^oC using a porous fibrous filter paper. In a laboratory-made solar steam generation real-time test system using commercial polystyrene foam as the insulation layer and the LLC film on porous fibrous filter paper as the water transport path, the LLC film exhibits a solar-driven water evaporation rate of 1.30 kg/m² h and a solar-vapor conversion efficiency of 77.5%. The LLC film also shows excellent performance in seawater desalination and sewage purification. The work provides a possible route for the use of low-cost and environmentally friendly biomass-based carbon materials in solar-driven steam generation.

太阳能驱动的界面蒸发由于其解决淡水短缺的潜力而备受关注。低成本和高效率的光热转换材料是应用的关键。低成本的荷叶基碳膜（LLC）用作太阳能驱动的蒸汽的光热转换介质是通过LLC的简单真空过滤制备的，该LLC在碳化温度为800 ^o C的情况下进行制备。多孔纤维滤纸。在实验室生产的太阳能蒸汽实时测试系统中，使用商用聚苯乙烯泡沫塑料作为绝缘层，并在多孔纤维滤纸上的LLC膜作为输水路径，LLC膜的太阳能驱动水蒸发速率为1.30 kg /米²h，太阳蒸气转化效率为77.5％。LLC膜在海水淡化和污水净化方面也显示出优异的性能。这项工作为在太阳能驱动的蒸汽产生中使用低成本和环保的基于生物质的碳材料提供了一条可能的途径。