Binary/Ternary MOF Nanocomposites for Multi‐Environment Indoor Atmospheric Water Harvesting

Abstract Introducing atmospheric water harvesting (AWH), beyond the arid atmosphere, under comfortable indoor humidity and temperature regime has its urgency in terms of commercialization and addressing the worldwide freshwater crisis. Herein, the synthesis and characterization of a series of binary (aminopropyl functionalized magnesium phyllosilicate or aminoclay, and CuBTC) and ternary (aminoclay, graphene oxide, and CuBTC) MOF nanocomposites and their water storage and harvesting properties from the indoor atmosphere are demonstrated. The nanocomposites show enhanced hydrothermal stability—39.5% increase in water uptake capacity (with respect to bulk CuBTC) with 67.2% of utmost water harvesting efficiency by blending aminoclay and graphene‐oxide with CuBTC MOF. The study further extrapolates the water collection dynamics by varying ambient humidity, release temperature and on‐demand sorption/desorption cycle under the ordinary indoor condition without any solar irradiation. The ternary nanocomposite enables 0.431 gg⁻¹ of water at 90% relative humidity with a maximum value of 0.445 gg⁻¹ indoor water collections per day.