Xu Jiale, Zhang Jingyi, Fu Benwei, Song Chengyi, Shang Wen, Tao Peng, Deng Tao
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Center of Hydrogen Science, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Appl Mater Interfaces. 2020 Oct 21;12(42):47612-47622. doi: 10.1021/acsami.0c14773. Epub 2020 Oct 13.
Solar-driven interfacial evaporation has received increasing research attention for clean water generation, but freshwater harvesting often occurs only during daytime. Herein, we report a strategy for all-day freshwater harvesting through combining solar-driven interfacial desalination and dew water generation. Through spray-coating carbon nanotubes onto a flexible substrate that has high-infrared emittance in the atmosphere window, a dual functional film was prepared to efficiently absorb solar energy for desalination at daytime and passively cool down the surface temperature to collect dew water at night. By integrating the dual functional film within a three-stage membrane distillation device, the home-made system achieved a drinkable freshwater collection efficiency of 71.1% when desalinating seawater under 1 sun illumination and achieved a dew water collection rate of 0.1 L m day at night. The readily available low-cost raw materials, simple fabrication process of the dual functional films, and the resultant all-day freshwater collection systems make the combined solar-thermal interfacial desalination and dew water collection a promising solution to alleviate the freshwater shortage in many underdeveloped regions, arid areas, and islands.
太阳能驱动的界面蒸发在清洁水生产方面受到了越来越多的研究关注，但淡水收集通常只在白天进行。在此，我们报告了一种通过结合太阳能驱动的界面脱盐和露水生成来实现全天淡水收集的策略。通过将碳纳米管喷涂到在大气窗口具有高红外发射率的柔性基板上，制备了一种双功能薄膜，该薄膜能够在白天有效吸收太阳能用于脱盐，并在夜间被动降低表面温度以收集露水。通过将双功能薄膜集成到三级膜蒸馏装置中，自制系统在1个太阳光照下对海水进行脱盐时，可饮用淡水收集效率达到71.1%，夜间露水收集速率为0.1 L m² 天。易于获得的低成本原材料、双功能薄膜简单的制造工艺以及由此产生的全天淡水收集系统，使得太阳能-热界面脱盐与露水收集相结合成为缓解许多欠发达地区、干旱地区和岛屿淡水短缺问题的一个有前景的解决方案。
