Bimetallic MOF‐Derived Solar‐Triggered Monolithic Adsorbent for Enhanced Atmospheric Water Harvesting

Abstract

AbstractThe development of economical, energy‐saving, and efficient metal‐organic framework (MOF)‐based adsorbents for atmospheric water collection is highly imperative for the rapid advancement of renewable freshwater resource exploitation. Herein, a feasible one‐step solvothermal formation strategy of bimetallic MOF (BMOF) is proposed and applied to construct a solar‐triggered monolithic adsorbent for enhanced atmospheric water collection. Benefiting from the reorganization and adjustment of topology structure by Al atoms and Fe atoms, the resultant BMOF(3) consisting of Al‐fumarate and MIL‐88A has a higher specific surface area (1202.99 m2 g−1) and pore volume (0.51 cm3 g−1), thereby outperforming the parental MOFs and other potential MOFs in absorbing water. Expanding upon this finding, the solar‐triggered monolithic adsorbent is further developed through a bottom‐up assembly of polyaniline/chitosan layers and hybridized BMOF(3) skeletons on a glass fiber support. The resultant monolithic adsorbent exhibits superior sorption‐desorption kinetics, leading to directional water transport and rapid solar‐assisted vapor diffusion. As a proof‐of‐concept demonstration, an exquisite water harvester is constructed to emphasize a high water yield of 1.19 g g−1 per day of the designed monolithic adsorbent. Therefore, the design and validation of bimetallic MOF‐derived solar‐triggered adsorbent in this work are expected to provide a reference for the large‐scale applications of MOF‐based atmospheric water harvesting.