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Rapid Cycling and Exceptional Yield in a Metal-Organic Framework Water Harvester

2019; American Chemical Society; Volume: 5; Issue: 10 Linguagem: Inglês

10.1021/acscentsci.9b00745

2374-7951

Nikita Hanikel, Mathieu S. Prévot, Farhad Fathieh, Eugene A. Kapustin, Hao Lyu, Haoze Wang, Nicolas J. Diercks, T. Grant Glover, Omar M. Yaghi,

Membrane Separation Technologies

Sorbent-assisted water harvesting from air represents an attractive way to address water scarcity in arid climates. Hitherto, sorbents developed for this technology have exclusively been designed to perform one water harvesting cycle (WHC) per day, but the productivities attained with this approach cannot reasonably meet the rising demand for drinking water. This work shows that a microporous aluminum-based metal-organic framework, MOF-303, can perform an adsorption-desorption cycle within minutes under a mild temperature swing, which opens the way for high-productivity water harvesting through rapid, continuous WHCs. Additionally, the favorable dynamic water sorption properties of MOF-303 allow it to outperform other commercial sorbents displaying excellent steady-state characteristics under similar experimental conditions. Finally, these findings are implemented in a new water harvester capable of generating 1.3 L kgMOF-1 day-1 in an indoor arid environment (32% relative humidity, 27 °C) and 0.7 L kgMOF-1 day-1 in the Mojave Desert (in conditions as extreme as 10% RH, 27 °C), representing an improvement by 1 order of magnitude over previously reported devices. This study demonstrates that creating sorbents capable of rapid water sorption dynamics, rather than merely focusing on high water capacities, is crucial to reach water production on a scale matching human consumption.