“…Investigation into the removal of CO 2 in the presence of water has been an area of active research in recent years. [31][32][33][34] Hicks et al discovered that an interaction between basic surface-bound groups and acidic CO 2 groups resulted in the formation of ammonium bicarbonate and carbonate species. Also being studied was the removal of H 2 S, 35 Cu 2+ , 36 Hg 2+ , 37,38 and Pb 2+ , Mn 2+ , Zn 2+ , Fe 2+ , Cd 2+ , and Ni 2+ .…”