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.

Confining organic cations in metal organic framework allows molecular level regulation of CO2 capture

“…As shown in the Fourier transform infrared (FT‐IR) spectra of [VMCA]@Cu‐BTC( n ) (Figure 1B), the peaks at 1646, 1446, and 1365 cm −1 were assigned to the bridging bidentate coordination of the carboxylate group, which were also observed in the spectrum of Cu‐BTC 40,43 . The peak at 1176 cm −1 corresponded to the stretching vibration signal of the CN bond on the imidazole unit, meanwhile, a characteristic peak at 1643 cm −1 was attributable to the CN bond of the imidazole group 44,45 .…”

Recent advances in porous adsorbent assisted atmospheric water harvesting: a review of adsorbent materials

“…For example, MIL-101 (Cr) has two pores with diameters of 2.9 and 3.4 nm, respectively, which results in an obvious hysteresis loop in its water vapor desorption curve [Figure 7C] [80] . Another mesoporous MOF (NU-1000) also exhibited this behavior [81] .…”

“…Copyright American Chemical Society; (B) the water vapor adsorption/desorption process of MOFs in psaAWH. (C) Water vapor adsorption isotherm of MIL-10 [80] and SALI-modified NU-1000 [81] under 25 o C. Reproduced with permission [80] . Copyright Elsevier.…”

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

“…[4][5][6][7][8] However, the current water production efficiency of AWH-based materials in low-humidity DOI: 10.1002/smll.202304477 environments is still unsatisfactory and far from large-scale practical applications, with the main bottlenecks of poor stability and low hydrophilicity. [9,10] The former can be manifested in hygroscopic saltbased adsorbents that tend to dissolve and leak during water capture, while the latter can be found in polymer gels that cannot capture water vapor in arid climates. [11,12] With the rapid development of materials engineering and digital nanotechnology, metal-organic framework (MOF) is envisioned as a novel generation of water adsorbents owing to low energy expenditure, long-term durability, high selectivity, and tunable properties together with high hydrophilicity.…”