Efficient nitrogen doped porous carbonaceous CO2 adsorbents based on lotus leaf

In this work, the waste biomass lotus leaf was converted into N-doped porous carbonaceous CO2 adsorbents. The synthesis process includes carbonization of lotus leaf, melamine post-treatment and KOH activation. For the resultant sorbents, high nitrogen content can be contained due to the melamine modification and advanced porous structure were formed by KOH etching. These samples were carefully characterized by different techniques and their CO2 adsorption properties were investigated in detail. These sorbents hold good CO2 adsorption abilities, up to 3.87 and 5.89 mmol/g at 25 and 0 degrees C under 1 bar, respectively. By thorough investigation, the combined interplay of N content and narrow microporous volume was found to be responsible for the CO2 uptake for this series of sorbents. Together with the high CO2 adsorption abilities, these carbons also display excellent reversibility, high CO2/N-2 selectivity, applicable heat of adsorption, fast CO2 adsorption kinetics and good dynamic CO2 adsorption capacity. This study reveals a universal method of obtaining N-doped porous carbonaceous sorbents from leaves. The low cost of raw materials accompanied by easy synthesis procedure disclose the enormous potential of leaves-based carbons in CO2 capture as well as many other applications. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.

Automated summary

In this study, waste biomass lotus leaf was converted into N-doped porous carbonaceous CO2 adsorbents with high nitrogen content and advanced porous structure. The sorbents exhibited excellent CO2 adsorption abilities, highlighting the significant potential of using waste plant resources for sustainable CO2 capture and other applications.