Synthesis of mesoporous carbons with controlled morphology and pore diameters from SBA-15 prepared through the microwave-assisted process and their CO2 adsorption capacity

Abstract

Mesoporous carbon materials (CMK-3-T-MW) with high surface area, different pore diameters and rod shaped morphology were synthesized via nanocasting technique using the SBA-15 templates prepared by ultra-fast microwave-assisted process under static condition. The combined microwave and static approach offers the highly ordered rod shaped morphology to the SBA-15 template, which was successfully replicated into the mesoporous carbon materials. By tuning the synthesis temperature of the template, it is possible to fabricate mesoporous carbons with different pore diameters and specific surface areas. These excellent materials can be utilized for various applications and here we demonstrate their use as adsorbents for CO2 molecules. A significant enhancement in the adsorption of CO2 was achieved for the mesoporous carbon with rod shaped morphology, large pore diameter and high surface area. The adsorption capacity of CMK-3-T-MW was also compared with commercially available activated carbon, multi walled carbon nanotubes (MWCNTs) and 2D and 3D highly basic mesoporous carbon nitrides (MCNs). The CO2 adsorption capacity of mesoporous carbon with controlled morphology is 24.4 mmol/g at 273 K and 30 bar pressure which is much higher than that of mesoporous carbon CMK-3-HT (20.3 mmol/g at the same conditions) prepared by the conventional hydrothermal method, activated carbons, MWCNTs, and MCNs.