“…Monoethanolamine (MEA) and diethanolamine (DEA) impregnated ZnCl 2 activated green coconut shell-derived porous carbon [206]. EDA and triethylenetetramine (TETA) impregnated mesoporous carbon [110], pentaethylenehexamine (PEHA) loaded chitosan-derived mesoporous carbon [210], tetraethylenepentamine (TEPA), monoethanolamine (MEA), diethanolamine (DEA), PEI and diethylenetriamine (DETA) impregnated wood ash [70], triethanolamine (TEA) functionalized KOH activated Jatropha curcas shell-based activated carbon [224], MEA impregnated corn and potato starch-derived porous carbon sorbents [227], DEA impregnated activated carbon [211], PEI impregnated mesoporous carbon microparticles and mesoporous carbon nanospheres (as shown in Figure 8a) [207], PEI functionalized graphitic carbon nitride [228], MEA and DEA impregnated activated carbon [216], DEA and MEA incorporated ZnCl 2 activated fresh green coconut shell-derived activated carbon [87], TEPA functionalized semi coke [228], EDA, DEA, TETA, and branched PEI impregnated porous carbon [218], PEI-functionalized MWCNTs [217], TEPA impregnated on MOF-derived carbon monolith [93], porous silica-coated MWCNTs prepared via nanocasting and PEI impregnation [223], branched PEI impregnated on graphene oxide [229], TEPA impregnated onto graphene and silica containing aerogel [194], and TEPA impregnated carbon aerogels prepared via sol-gel process [215]. The structure of amine-functionalized mesoporous carbons synthesized via physical impregnation of PEI is demonstrated in Figure 8a.…”