Simplified Steps to Synthesize Ordered Mesoporous Carbon Materials with High Carbon Dioxide Capturing Performance

Compared with the synthesis process of the CMK-3 material, the ordered mesoporous carbon (OMC) materials were successfully synthesized by simplifying the synthesis steps. The silica/P123 composite material that had formed nanostructures was not filtered, washed, and calcined to form SBA-15 material, but it was directly used as a hard template to synthesize OMC materials. The self-assembly of block polymers (P123) in the pore space was not removed but directly carbonized as partial carbon source. The template agent (surfactant P123) was not removed but used as part of the carbon source. The synthetic materials exhibited large pore volume, high specific surface area, regular hexagonal pore structures, and good long-range order, which was confirmed by the 77 K N2 adsorption–desorption isotherms, transmission electron microscopy (TEM), and small-angle X-ray diffraction (XRD). The synthetic materials were applied to capture carbon dioxide, and the results of carbon dioxide capture were better than those of the CMK-3 material reported previously. Under the conditions of 3.4 MPa pressure and 275 K temperature, the CO2 capture capacity of the dry synthetic MC-1.5–0.8 material without water was 25 mmol/g at 275 K, which was 1.4 times that of the dry CMK-3 material. In addition, the CO2 capture capacity of the same pre-adsorbed water MC-1.5–0.8 sample with Rw = 3.8 at 3.3 MPa was 47.6 mmol/g, which was 1.9 times that of the dry MC-1.5–0.8 sample.