The increasing emission of carbon dioxide (CO2) to the atmosphere has gained worldwide concern due to its main contribution to climate changes, global warming, and the greenhouse effect. Numbers of technologies have been carried out to remove this hazardous gas from the environment such as absorption, adsorption, membrane separation, cryogenic separation, and the biological process. Due to limitation of the current absorption technique, CO2 adsorption technique using porous solid adsorbents seems to be a potential candidate in capturing CO2. This is due to the advantages such as low regeneration energy requirements, no liquid waste and low cost. Furthermore, amine functionalization such as APTES on solid adsorbents has been progressively study for the usage of enhancing CO2 adsorption. The uses of adsorbents that modified with APTES could enhance the CO2 adsorption performance due to the chemisorption of -NH2 bond from the amine that further improve the CO2 adsorption performance in terms of the CO2 uptake and selectivity. Besides that, functionalization of APTES on adsorbent will also greatly enhance the reactivity towards CO2. In this review, the impact of the diverse amine loadings on different adsorbents and the type of solvent used for APTES-functionalization towards CO2 capture performance was thoroughly elaborated. The suitable reaction conditions and the regenerability of the adsorbents that could significantly affect their CO2 adsorption capacity were also discussed in detail. Other than distributing useful knowledge on the current progress of the APTES-functionalization adsorbents, this review is anticipated to provide benefit for the industrial and academic usage and appeal more attention in this fascinating area of CO2 capture
