Wood-Inspired Ultrafast High-Performance Adsorbents for CO₂ Capture

Under favorable regeneration conditions (120 °C, 100% CO 2 ), ultrafast adsorption kinetics and excellent long-term cycle stability are still the biggest obstacles for amine-based solid CO 2 adsorbents. Inspired by natural wood, a biochar with a highly ordered pore structure and excellent thermal conductivity was prepared and used as a carrier of organic amines to prepare ideal CO 2 adsorbents. The results showed that the prepared adsorbent has a very high adsorption working capacity (4.23 mmol CO 2 ·g –1 ), and its performance remains stable even after 30 adsorption–desorption cycles in the harsh desorption environment (120 °C, 100% CO 2 ). Due to the existence of the hierarchical structure, the adsorbent exhibited ultra-fast adsorption kinetics, and the reaction rate constant is 37 times higher than that of traditional silica. This adsorbent also showed a very low regeneration heat of 1.64 MJ·kg –1 (CO 2 ), which is especially important for the practical application. Therefore, these biochar-based adsorbents derived from natural wood make the CO 2 capture process promising.