A Peach‐Kernel‐Derived Ultramicroporous Carbon with Extremely High CO2‐Capture Ability

Abstract

AbstractUltra‐microporous carbon materials with high CO2 capture ability are prepared by two‐step carbonization of peach kernels, including pre‐carbonization at a relatively lower temperature (400 °C) and KOH activation at a higher temperature (700–900 °C). Notably, the micropore proportion of the obtained carbon is up to 97.65 %, indicating almost all the pores are microporous. The optimized ultra‐microporous carbon material exhibits an extremely high CO2 adsorption capacity of up to 4.92 mmol g−1 at 1 bar, and 1.64 mmol g−1 at 0.15 bar and 25 °C, and good CO2/N2 selectivity, which makes it one of the best CO2 adsorption materials. The specific surface areas of the prepared materials are in the range of 700–1000 m2 g−1. Our results show that there is no direct relationship between the specific surface and CO2 adsorption capacity. It reveals that the pore structure and microporous porosity determine the interaction between CO2 molecules and the carbon materials in our work. In addition, the ultra‐microporous carbon is feasible for commercial‐scale application, which provides a new adsorbent for industrial CO2 capture.