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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A Novel Geopolymer Route to Microporous Carbons with Effective CO2 Uptake Capacity

2018년 9월 1일 13시 02분 53초
MAT.P-485 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 18일 (목요일) 11:00~12:30
Material Chemistry
저자 및
Yirong Pei, Goeun Choi, Jin-ho Choy*
Department of Chemistry and Nanoscience, Ewha Womans University, Korea
A novel geopolymer route to microporous carbons with high specific surface area and large pore volume was reported in this research. The present low-cost process is composed of 2 steps; (1) synthesis of porous geopolymer (PG) from metakaolin, which can be prepared by heating natural kaolin up to 700 oC and (2) synthesis of porous carbons (CPG) replicating from PG with the carbon source such as sucrose and gelatin, respectively. The porous nature of PG was observed to be mesoporous with a pore diameter of 2.90 nm and a well-ordered hexagonal channel structure. The porous CPG-S replicated from this PG template with sucrose was determined to be highly microporous with the BET surface area of ~ 1200 m2/g and the pore volume of ~ 1.2 cm3/g, but with the small amount of meso and macropores. According to the CO2 uptake experiments for the present CPG-S, the high capacity of 3.08 mmol/g could be observed even at 273 K and 1 atm due to the physi-sorption of CO2. In case of CPG-G, which was replicated with the gelatin carbon source, it exhibited relatively high uptake capacity under relatively lower pressure (< 0.10 atm) owing to the chemi-sorption of acidic CO2 on Lewis basic N-functionalized internal surface. When the mixed carbon precursor of sucrose and gelatin (1:1 mass ratio) was used, a synergistic effect could be observed in terms of porosity and N-functioned internal surface as well demonstrated with the highest CO2 uptake capacity under the pressure rage of 0.20 ~ 0.65 atm. It is, therefore, concluded that the present geopolymer template route to microporous carbons could offer an effective and low-cost strategy and eventually provide a promising way of industrial applications of porous carbons.