Bimodal Mesoporous Carbons for CO 2 Sorption Application

Figure S1. SEM images of BMC-1 (a), BMC-2 (b), BMC-3 (c), and BMC-4 (d). Synthesis of the BMS materials. The homogeneous mixture of 10 wt % CTAOH aqueous solution (5.0 g, 1.66 mmol, TCI) and deionized water (240 g, 13.3 mol) was heated at 353 K under constant stirring for about 1 h (500 rpm). TEOS (4.0 g, 19.2 mmol, Aldrich) was injected rapidly into the mixture. The reaction mixture was stirred at 353 K for 24 h. The as-made BMS-1 was recovered by hot filtration and washed with a copious amount of water. The isolated solid was dried in air overnight. The template-free BMS-1 was obtained via calcination in air at 823 K for 6 h. The BMS-2 material was prepared by adding Brij76 (1.0 g, 1.41 mmol, HO(CH2CH2O)10C18H35, TCI) into the aforementioned reaction mixture. P123 (1.0 g, 0.182 mmol, HO(CH2CH2O)20(CH2CH(CH3)O)70(CH2CH2O)20H, Aldrich) was added to the reaction mixture for the preparation of BMS-3. P123 (0.5 g, 0.09 mmol, Aldrich) was added to the reaction mixture for the preparation of BMS-4. Other preparation conditions are same unless otherwise noted. Synthesis of the BMC materials. The preparation of BMC-1 from BMS-1 is described in detail. The BMS-1 (0.5 g) was suspended in 50 mL of 0.5 M of p-toluenesulfonic acid (pTSA) ethanolic solution. The suspension was gently stirred at room filtration and dried at 353 K for 2 h. 1.0 mL of furfuryl alcohol was mixed with the pTSA-loaded BMS-1. The solids were carbonized at 1073 K in N2 flow for 2 h (ramping rate = 2 °C/min). The resulting solids were immersed into 30 mL of 48 wt % HF aqueous solution and maintained at room temperature for 12 h. The silica-free BMC-1 was obtained by filtration and washed with a copious amount of water. The BMC-1 was further dried at 353 K overnight. Physical measurements. The N2 sorption analysis was performed on a Belsorp-miniII at 77 K (BEL Japan). The samples were dried at 423 K under high vacuum for 2 h. Low pressure CO2 adsorption measurements were performed at 196 K (2propanol/dry ice bath), 273 K (ice bath), and 298 K (water bath) on a Belsorp-miniII. All other samples were dried at 423 K for 2 h under high vacuum prior to the measurements. TEM images were obtained by using JEOL JEM-2100F operated at 200 kV. FE-SEM images were obtained using Jeol JSM-7500F.