Mechanochemical Synthesis of Tannic Acid-Fe Coordination Compound and Its Derived Porous Carbon for CO2 Adsorption

A tannic acid-Fe coordination compound has been prepared via a simple mechanochemical method. The compound could be used as precursors for the fabrication of porous carbon, which was successfully applied as adsorbent for CO2 capture. The obtained porous adsorbent, NFePC-10-A, exhibited relatively high CO2 uptake capacities of 5.8 and 3.4 mmol g–1 at 0 and 25 °C, respectively. In addition, the initial isosteric heat of adsorption and selectivity for CO2/N2 were as high as 63.16 kJ mol–1 and 22.7 (0 °C). Meanwhile, the adsorbent underwent an efficient reusability, indicating a good potential for practical use. This feasible strategy might provide a novel precursor for the large-scale production of bio-derived carbonaceous adsorbents with tailored texture and porosity for CO2 capture and storage.