A Durable Sorbent to Unlock the Sustainable Future: Room Temperature and Scalable Production of Aluminium Formate through Mechanochemical Method for Efficient and Selective CO2 Capture

Abstract Carbon dioxide (CO 2 ) capture is essential for addressing climate change, requiring the development of efficient, scalable, and sustainable sorbent materials. This study presents microporous aluminum formate (ALF) synthesized via a novel, room‐temperature mechanochemical ball milling method. This green, solvent‐free approach enables kilogram‐scale production using inexpensive raw materials under ambient conditions. The resulting ALF exhibits a high CO 2 adsorption capacity of 3.97 mmol·g −1 at 1 bar and 278 K, with a moderate isosteric heat of adsorption ( Q st = 42.1 kJ·mol −1 ), allowing energy‐efficient regeneration. ALF also demonstrates rapid adsorption kinetics (90% uptake within 5 min), excellent recyclability over 100 cycles, and remarkable CO 2 /N 2 selectivity of 341, highlighting its suitability for practical applications. Importantly, the material maintains significant CO 2 uptake (3.26 mmol·g −1 ) even under humid conditions. ALF can be shaped into mechanically robust, millimeter‐sized pellets, making it ideal for industrial‐scale deployment. The comparative evaluation shows that ALF's CO 2 capture performance rivals leading MOFs such as CALF‐20, UTSA‐16, MOF‐74 variants, and SIFSIX‐series materials. Overall, ALF emerges as a cost‐effective, durable, and high‐performing sorbent, offering a promising pathway toward scalable, sustainable carbon capture solutions.