Wood-Inspired Ultrafast High-Performance Adsorbents for CO2 Capture

Under favorable regeneration conditions (120 degrees C, 100% CO2), ultrafast adsorption kinetics and excellent long-term cycle stability are still the biggest obstacles for amine-based solid CO2 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 CO2 adsorbents. The results showed that the prepared adsorbent has a very high adsorption working capacity (4.23 mmol CO2 center dot g-1), and its performance remains stable even after 30 adsorption-desorption cycles in the harsh desorption environment (120 degrees C, 100% CO2). 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 center dot kg-1 (CO2), which is especially important for the practical application. Therefore, these biochar-based adsorbents derived from natural wood make the CO2 capture process promising.

Automated summary

Inspired by natural wood, a biochar with a highly ordered pore structure and excellent thermal conductivity was prepared as a carrier for organic amines to prepare ideal CO2 adsorbents. The prepared adsorbent showed high adsorption capacity, stable performance, ultrafast adsorption kinetics, and low regeneration heat, making it promising for CO2 capture.