Harvesting Water from Air with High-Capacity, Stable Furan-Based Metal-Organic Frameworks

Area of Science:

• Materials Science
• Chemistry
• Environmental Science

Background:

• Metal-organic frameworks (MOFs) are promising materials for gas storage and separation.
• Developing MOFs with high water stability and uptake is crucial for atmospheric water harvesting.
• Isoreticular MOFs offer tunable properties for specific applications.

Purpose of the Study:

• To synthesize and characterize novel furan-based MOFs for atmospheric water harvesting.
• To evaluate the water uptake capacity and long-term stability of these MOFs.
• To investigate the effect of a double 'long arm' extension strategy on MOF performance.

Main Methods:

• Synthesis of two isoreticular furan-based MOFs, MOF-LA2-1(furan) and MOF-LA2-2(furan).
• Characterization using single-crystal X-ray diffraction (SCXRD).
• Evaluation of water uptake and desorption cycles under specific conditions (1.70 kPa).

Main Results:

• MOF-LA2-1(furan) and MOF-LA2-2(furan) exhibit high water working capacities of 0.41 and 0.48 g/g, respectively.
• Both MOFs demonstrate exceptional stability, with negligible water uptake loss after 165 adsorption-desorption cycles.
• MOF-LA2-2(furan) is the first aluminum MOF utilizing a double 'long arm' extension strategy.

Conclusions:

• The synthesized furan-based MOFs are highly stable and efficient sorbents for atmospheric water harvesting.
• The 'long arm' extension strategy is effective in enhancing MOF performance for water capture.
• These findings provide valuable insights for designing durable and water-stable MOFs for environmental applications.