Nanoporous metal oxide functionalized carbon sorbent for carbon dioxide capture

31 October 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


A nanoporous carbon sorbent was synthesized, functionalized with magnesium oxide (MgO), and demonstrated to be a high-performance CO2 capture adsorbent. Taking advantage of a low cost and scalable preparation method, the unique design of the sorbent fosters strong interactions between the metals and acid moieties in the porous carbon media. The high surface area (2130 m2/g) and nanopores (1-2 nm) of the porous carbon enable a high concentration and uniform distribution of metal oxide throughout the sorbent. CO2 uptake capacity of the sorbent at 400 ppm CO2 was 0.12 mmol CO2/g sorbent, which is two orders of magnitude higher than that of the unfunctionalized porous carbon. The CO2 adsorption performance of the MgO functionalized nanoporous carbon at a low partial pressure of CO2 compares favourably with reported CO2 uptake of Mg oxide functionalized porous carbons as well as porous and non-porous metal oxides.


metal oxide
porous carbon
carbon capture
direct air capture


Comments are not moderated before they are posted, but they can be removed by the site moderators if they are found to be in contravention of our Commenting Policy [opens in a new tab] - please read this policy before you post. Comments should be used for scholarly discussion of the content in question. You can find more information about how to use the commenting feature here [opens in a new tab] .
This site is protected by reCAPTCHA and the Google Privacy Policy [opens in a new tab] and Terms of Service [opens in a new tab] apply.