在金属有机框架中通过系统的离子交换实现可逆吸水的创纪录吸水剂
Adam J Rieth1, Ashley M Wright1, Grigorii Skorupskii1
1Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.
Journal of the American Chemical Society
|August 10, 2019
概括
研究人员修改了金属有机框架以控制低湿度的水蒸气吸收. 引入离子使孔隙填充转移到较低的湿度,使得水收集和冷却的新应用成为可能.
科学领域:
- 材料科学
- 化学学
- 环境科学
背景情况:
- 在低湿度下可逆捕获水蒸气是大气水收集和可持续冷却技术的关键.
- 目前的方法在效率和环境影响方面受到限制,原因是碳和碳.
研究的目的:
- 在金属有机框架 (MOF) 中调节孔隙填充的开始,以增强水蒸气吸收.
- 研究离子交换对MOF吸水性能的影响.
主要方法:
- 用化物,氧化物和化物替代MOF中的化物离子.
- 用红外光谱分析了水中的结结构.
- 为了评估材料的稳定性,进行了吸附- 脱吸循环.
主要成果:
- 用化物或氧化物取代化物并没有降低孔隙填充的相对湿度.
- 引入化物显著地将孔隙填充转移到较低的相对湿度.
- 两种MOF材料在400个循环中表现出创纪录的吸水能力和稳定性.
结论:
- 孔径和水壁接口相互作用对于水孔填充至关重要,而不是孔壁的水友性.
- 离子交换为特定的水蒸气捕获应用提供了调整MOF属性的可行策略.
- 已开发的MOF显示了高效和稳定的大气水收集和冷却的前景.
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