MOF-303 2050043-41-7

MOF-303(Al) is a metal-organic framework (MOF) material formed by the combination of aluminum ions and 3,5-pyrazoledicarboxylic acid (H2PDC) ligands. Renowned for its ability to efficiently adsorb water molecules in low-humidity environments, it is considered a key material for addressing water scarcity in arid regions.

**Key Characteristics and Parameters**
* **Chemical Composition:** The coordinating metal is aluminum (Al), and the organic ligand is 3,5-pyrazoledicarboxylic acid.
* **Structural Features:** It features vertical channels (pore size ~0.6 nm) and a high specific surface area (BET surface area >800 m²/g); it appears as a white powder with particle sizes typically ranging from 500 nm to 1 μm.
* **Water Adsorption Performance:** It exhibits strong hygroscopicity even under extremely dry conditions (relative humidity <20%), with a maximum water uptake of 0.54 g H₂O/g MOF-303; the adsorbed water can be rapidly released via heating, enabling cyclic use.
* **Stability:** It is relatively stable in air, aqueous solutions, and mildly alkaline conditions, with a thermal decomposition temperature exceeding 400°C, though it is unstable under strongly alkaline conditions.

**Major Application Areas**
* **Atmospheric Water Harvesting:** Acting as a highly efficient water adsorbent, it can harvest drinking water from desert air using solar energy; its cost is significantly lower than that of earlier zirconium-based MOF materials (such as MOF-801).
* **Membrane Separation Technology:** When fabricated into hollow fiber membranes, it demonstrates excellent water permeability and separation efficiency in water/ethanol pervaporation and dye nanofiltration; notably, membranes featuring oriented growth—achieved via the dual-source seeding method—exhibit significantly enhanced flux.
* **Catalysis and Adsorption:** It can serve as a Lewis acid catalyst and be utilized for the separation and recovery of transition metal ions from wastewater.