“…The CO 2 adsorption efficiency can, therefore, be improved by selecting an appropriately designed adsorbent material though solid adsorbents, like ordered porous carbon, activated carbon fibers, natural products derived porous carbon, activated carbon, and graphene, or noncarbonated adsorbents, such as silica, zeolites, porous polymers and their membranes, metal organic frameworks, alkali metal-based materials, and metal oxide carbonates, have some advantages over other adsorbent material, for example, ease of handling, required low regeneration energy, low cost, high capacity for adsorption, and relatively faster adsorption–desorption kinetics. These methods are partially discouraged due to their certain limitations, such as renewal and recyclability issues, high-temperature reactions, and complex procedures. − …”