Abstract
The passive capture of clean water from humid air without reliance on bulky equipment and high energy has been a substantial challenge and has attracted significant interest as a potential environmentally friendly alternative to traditional water harvesting methods. Metal-organic frameworks (MOFs) offer a high potential for this application due to their structural versatility which permits scalable, facile modulations of structural and functional elements. Although MOFs are promising materials for water harvesting, little research has been done to address the microstructure-adsorbing characteristics relationship with respect to the dynamic adsorption-desorption process. In this article, we present a parametric study of nine hydrolytically stable MOFs with diverse structures for unraveling fundamental material properties that govern the kinetics of water sequestration in this class of materials as well as investigating overall uptake capacity gravimetrically. The effects of temperature, relative humidity, and powder bed thickness on the adsorption-desorption process are explored for achieving optimal operational parameters. We found that Zr-MOF-808 can produce up to 8.66 LH2O kg−1MOF day−1, an extraordinary finding that outperforms any previously reported values for MOF-based systems. The presented findings help to deepen our understanding and guide the discovery of next-generation water harvesting materials.
Highlights
Despite the rapid growth of modern infrastructure, access to clean water remains a critical issue and challenge to humanity that is projected to increase at a rate faster than that of energy production[1]
We investigated a series of Metal-organic frameworks (MOFs) with a wide variety of structural topologies and chemical functionalities for atmospheric water harvesting and studied their structure-property relationships
Modulation of powder bed depth suggests the competition between intracrystalline and intercrystalline diffusivities control water vapor dynamics in different thickness regimes, revealing that all MOFs studied have similar uptake dynamics at a bed thickness of 2 mm, regardless of MOF properties
Summary
Despite the rapid growth of modern infrastructure, access to clean water remains a critical issue and challenge to humanity that is projected to increase at a rate faster than that of energy production[1]. This work reveals the significance of water uptake dynamics, as opposed to the majority of previous studies that focused on controlling the adsorption equilibrium and total water capacity in materials[8,9,10,11]. These are essential characteristics for water sequestering materials to possess, the more valuable property is fast and efficient production of water. Understanding the structure-property relationship controlling these effects is vital for the creation of optimized water harvesting materials based on MOFs. In this study, we evaluated the effects of relative humidity, temperature, and the dynamic sorption properties on a wide range of MOFs with different nodes and strut functionalities. Our ultimate goal is to develop a design strategy for ambient water harvesting systems and guide the development of next-generation water harvesting materials
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