PAN계 탄소섬유의 활성화 온도에 따른 표면구조의 변화 및 흡착 특성

박수진; 김기동

Polymer(Korea), Vol.22, No.6, 994-998, November, 1998

Export Citation

PAN계 탄소섬유의 활성화 온도에 따른 표면구조의 변화 및 흡착 특성

Influence of Activation Temperature on Surface Structure Changes and Adsorption Properties of PAN-based Carbon Fibers

박수진, 김기동

초록

본 연구에서는 산화 처리된 PAN계 탄소섬유를 사용하여 700, 800, 900 및 1000℃의 온도로 2시간동안 CO₂를 유입 기체로 하여 각각 활성화시켰다. 이렇게 제조된 활성 탄소섬유의 흡착 특성을 활성화 온도에 따라 연구하였다. 활성 탄소섬유의 표면 특성은 N₂ 기체 흡착에 따라 측정하였으며, 그 표면 성질은 pH 및 Boehm의 선택중화법에 따른 표면 산도 및 표면 염기도를 측정하였다. 활성 탄소섬유의 BET 비표면적, 총 기공 부피 및 기공 크기 분포도 등은 활성화 온도에 따라 많은 차이를 나타내었으며, 본 실험의 활성화 조건 중 1000℃에서 활성화시킨 활성 탄소섬유의 BET 비표면적, 총 기공 부피가 가장 큰 것으로 나타났다. 또한 활성화 온도는 활성 탄소섬유의 표면 성질에도 많은 영향을 주는데 활성화 온도가 800℃ 이하인 경우 활성 탄소섬유의 표면 성질은 약한 산성을 띠며, 900℃ 이상의 고온에서 활성화된 활성 탄소섬유는 염기성을 나타내었다.

In this work a series of activated carbon fibers have been prepared by CO₂ activation of oxidized PAN-based carbon fibers at 700, 800, 900 and 1000 ℃ for 2 hrs, respectively. The adsorption properties of the activated carbon fibers(ACFs) were studied as a function of the heat treatment temperature(HTT). The ACFs were characterized by N₂ gas adsorption and pH value and acid-base values of the carbon surfaces. As a result, ACFs showed different BET surface areas, total pore volumes and pore size distributions, depending on activation conditions. Among them, the condition derived from temperature at 1000 ℃ for 2 hrs gave the highest BET surface area, total pore volume. When the activation temperature was less than 800 ℃, the surface of ACFs have been developed in acidic nature, but basic properties have increased in increasing the HTT at higher than 900 ℃.

Keywords:carbon fiber;activation;adsorption property;surface property

[References]

Donnet JB, Bansal RC, "Carbon Fibers," Marcel Dekker, New York (1990)
Chan WC, Die Angew. Makro. Chem., 213, 3724 (1993)
Park SJ, Donnet JB, J. Colloid Interface Sci., 200(1), 46 (1998)
Suzuki M, Carbon, 32, 577 (1994)
Ermolenko IN, Lyubliner IP, Gulko NV, "Chemically Modified Carbon Fibers," VCH, Weinheim (1990)
Dubinin MM, "Progress in Surface and Membrane Science," Academic Press, New York (1975)
Park SJ, Brendle M, J. Colloid Interface Sci., 188(2), 336 (1997)
Polovina M, Babic B, Kaluderovic B, Dekanski A, Carbon, 35, 1047 (1997)
Biniak S, Szymanski G, Siedlewski J, Swiatkoeski A, Carbon, 35, 12 (1997)
Barton SS, Evans MJB, Hallilop E, Macdonald JAF, Carbon, 35, 1361 (1997)
Leng CC, Pinto NG, Carbon, 35, 1375 (1997)
Jaroniec M, Madey R, "Physical Adsorption on Heterogeneous Solids," Elsevier, Amsterdam (1988)
Boehm HP, Heck W, Sappok R, Angew. Chem., 76, 742 (1964)
Brunauer S, Emmett PH, Teller E, J. Am. Chem. Soc., 60, 309 (1938)
Barrett EP, Joyner LG, Halenda PP, J. Am. Chem. Soc., 73, 373 (1951)
Bansal RC, Donnet JB, Stoeckli F, "Active Carbon," Marcel Dekker, New York (1988)
Leony Leon CA, Solar JM, Calemma V, Radovic LR, Carbon, 30, 797 (1993)
Sing KSW, Everett DH, Haul RAW, Pure Appl. Chem., 57, 603 (1985)

[Referenced By]

[1] Donnet JB, Bansal RC, "Carbon Fibers," Marcel Dekker, New York (1990)

[2] Chan WC, Die Angew. Makro. Chem., 213, 3724 (1993)

[3] Park SJ, Donnet JB, J. Colloid Interface Sci., 200(1), 46 (1998)

[4] Suzuki M, Carbon, 32, 577 (1994)

[5] Ermolenko IN, Lyubliner IP, Gulko NV, "Chemically Modified Carbon Fibers," VCH, Weinheim (1990)

[6] Dubinin MM, "Progress in Surface and Membrane Science," Academic Press, New York (1975)

[7] Park SJ, Brendle M, J. Colloid Interface Sci., 188(2), 336 (1997)

[8] Polovina M, Babic B, Kaluderovic B, Dekanski A, Carbon, 35, 1047 (1997)

[9] Biniak S, Szymanski G, Siedlewski J, Swiatkoeski A, Carbon, 35, 12 (1997)

[10] Barton SS, Evans MJB, Hallilop E, Macdonald JAF, Carbon, 35, 1361 (1997)

[11] Leng CC, Pinto NG, Carbon, 35, 1375 (1997)

[12] Jaroniec M, Madey R, "Physical Adsorption on Heterogeneous Solids," Elsevier, Amsterdam (1988)

[13] Boehm HP, Heck W, Sappok R, Angew. Chem., 76, 742 (1964)

[14] Brunauer S, Emmett PH, Teller E, J. Am. Chem. Soc., 60, 309 (1938)

[15] Barrett EP, Joyner LG, Halenda PP, J. Am. Chem. Soc., 73, 373 (1951)

[16] Bansal RC, Donnet JB, Stoeckli F, "Active Carbon," Marcel Dekker, New York (1988)

[17] Leony Leon CA, Solar JM, Calemma V, Radovic LR, Carbon, 30, 797 (1993)

[18] Sing KSW, Everett DH, Haul RAW, Pure Appl. Chem., 57, 603 (1985)