Kang Min Seok, Heo Incheol, Park Sun Ho, Bae Jinhee, Kim Sangyeop, Kim Gyuchan, Kim Byung-Hyun, Jeong Nak Cheon, Yoo Won Cheol
Department of Applied Chemistry, Center for Bionano Intelligence Education and Research, Hanyang University, ERICA, Ansan, 15588, Republic of Korea.
Department of Physics and Chemistry, DGIST, Daegu, 42988, Republic of Korea.
Nat Commun. 2024 Nov 12;15(1):9793. doi: 10.1038/s41467-024-53853-7.
Adsorption-based atmospheric water harvesting (AWH) has the potential to address water scarcity in arid regions. However, developing adsorbents that effectively capture water at a low relative humidity (RH < 30%) and release it with minimal energy consumption remains a challenge. Herein, we report a fluorophenyl oligomer (FO)-incorporated metal-organic framework (MOF), HKUST-1 (FO@HK), which exhibits fast adsorption kinetics at low RH levels and facile desorption by sunlight. The incorporated fluorophenyl undergoes vapor-phase polymerization at the metal center to generate fluorophenyl oligomers that enhance the hydrolytic stability of FO@HK while preserving its characteristic water sorption behavior. The FO@HK exhibited vapor sorption rates of 8.04 and 11.76 L kg h at 20 and 30% RH, respectively, which are better than the state-of-the-art AWH sorbents. Outdoor tests using a solar-driven large-scale AWH device demonstrate that the sorbent can harvest 264.8 mL of water at a rate of 2.62 L kg per day. This study provides a ubiquitous strategy for transforming water-sensitive MOFs into AWH sorbents.
基于吸附的大气取水（AWH）有潜力解决干旱地区的水资源短缺问题。然而，开发能在低相对湿度（RH < 30%）下有效捕获水分并以最低能耗释放水分的吸附剂仍然是一项挑战。在此，我们报告了一种掺入氟苯基低聚物（FO）的金属有机框架（MOF），即HKUST-1（FO@HK），它在低RH水平下表现出快速的吸附动力学，并且能通过阳光轻松解吸。掺入的氟苯基在金属中心发生气相聚合，生成氟苯基低聚物，增强了FO@HK的水解稳定性，同时保留了其特有的水吸附行为。FO@HK在20%和30%RH下的蒸汽吸附速率分别为8.04和11.76 L kg h，优于目前最先进的AWH吸附剂。使用太阳能驱动的大规模AWH装置进行的户外测试表明，该吸附剂每天能够以2.62 L kg的速率收集264.8 mL的水。这项研究为将对水敏感的MOF转化为AWH吸附剂提供了一种通用策略。
