MOF supraparticles for atmosphere water harvesting at low humidity

Abstract

Developing efficient water adsorbents for atmospheric water harvesting in desert regions still remains a challenge due to the lack of useful strategies to enhance low-pressure water uptakes and adsorption-desorption kinetics....

Ca-MOF-Derived Porous Sorbents for High-Yield Solar-Driven Atmosphere Water Harvesting

“…Figure b shows the water released and condensed on the inner wall of the harvester within 40 min. After 7 h of the water harvesting process, we collected 1.13 L of the adsorbents per kg per day, which is higher than the reported MOF adsorbents in arid conditions powered by sunlight. ,,,,– Subsequently, the quality of the collected water was analyzed by ICP–OES and ion chromatography, as shown in Figure c. The ion concentrations of Ca 2+ , K + , Mg 2+ , Na + , and Cl – in the collected water are well below the World Health Organization drinking water standard (10 3 ppm), demonstrating the practical application potential of PCC-42 to address the problems of water scarcity.…”

“…High hydrophilicity from MOF precursors and excellent photothermal properties of porous carbon enable achievement of multiple adsorption–desorption cycles under sunlight. However, the practical outdoor solar-driven SAWH performance based on MOF adsorbents ranges from 0.1 to 0.82 L kg –1 day –1 in the arid climate, ,,,,– which is insufficient to meet personal daily drinking water needs. Therefore, it is necessary to explore new approaches for designing and synthesizing MOF-based water sorbents to achieve high water uptake capacity, solar-driven rapid cycling, and higher water production.…”

Ambient Synthesis of Metal–Organic Framework-Derived Bimetallic Layered Double Hydroxide Nanosheets by the Composition Inheritance Strategy for Efficient Microwave Attenuation Applications

“…Impedance match is another important factor that has obvious influence on the EMA performance of a materials, apart from dielectric loss and magnetic loss, which determines how much EM wave can enter into absorbents and is reflected by the comparison between tan δ ε and tan δ μ . The impedance matching ratio value (Zr) can be used to reveal the impedance matching of absorbents, which can be expressed as follows 54,62 = Zr r r (6) If ε r = μ r , the Zr will be equal to 1, demonstrating that the incident EM waves enter the absorbents with zero reflection. As shown in Figure 9b, nearly all the Zr values of Zn, Ni-LMc deviate from 1, especially in most of the high-frequency region, indicating the poor impedance.…”

“…Metal–organic frameworks (MOFs), which are constructed by metal/metal–oxygen clusters and organic ligands, have been recently paid great attention in various fields of gas storage and separation, sensor, catalysis, water collection, etc. − More importantly, they have been proven to be ideal templates for fabricating versatile composite materials due to their designable composition and flexible structures. − The most attractive synthesis strategy is the thermal decomposition or carbothermic reduction process of MOFs, which can convert the raw material into carbon, metal, metallic compounds, or their hybrids in a facile manner by controlling the pyrolysis temperature in an atmosphere filled with air, oxygen, or inert gases. − Moreover, the thermal treatment process will partially inherit the merits of the porous structure of MOFs or produce some new large pores that are caused by the emission of gas from the burning of organic compounds. The aforementioned benefits of the MOF derivatives are commonly perceived as key factors in obtaining high-performance MOF-based EMA composites.…”

Shaping the Water-Harvesting Behavior of Metal–Organic Frameworks Aided by Fine-Tuned GPT Models

“…The measurements reveal that all LAMOFs exhibit a singlestep isotherm with isotherm inflection points at 13,18,25,26,31,32,36,40,45, and 53% RH (Figure 3c and Table 1). This range effectively encompasses nearly all desirable operational RH environments for water harvesting from arid air, allowing for the material selection to be more flexible and tailored to specific real-world environments.…”