ABSTRACT
CO2 is a major greenhouse gas, so CO2 capturing is a solution to global warming. In this chapter, different adsorbent-based CO2 sequestration processes have been discussed. Among many processes, adsorption is the easiest, simple, and relatively economic. Thus, researchers have used many conventional adsorbents for capturing CO2 from the atmosphere and/or a mixture of gases. Conventional adsorbents such as activated charcoal, zeolite, and alkali-based metal ions have been used for CO2 sequestration. However, drawbacks of conventional adsorbents such as inefficient sorption capacity, poor recyclability, and technical difficulties make researchers think of new adsorbents. New materials such as ionic liquids and highly porous materials show better CO2-capturing abilities. To improve the CO2-capturing abilities of adsorbents, the adsorbents are modified with different types of carbonaceous or non-carbonaceous nanomaterials. The CO2-capturing abilities of those nanocomposites are found to be promising. However, data regarding the reuse potential of those nanocomposites are not studied yet. Thus, more detailed studies should be undertaken to understand the potential of the nanocomposites over the conventional materials for CO2 sequestration.
