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김영옥,고경렬,박영태,유승곤 ( Young Ok Kim,Kyung Ryeol Ko,Young Tae Park,Seung Kon Ryu ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.3
Isotropic pitch based carbon fibers have been activated at different levels of burn-off by steam diluted in nitrogen. There is a slight uptake of CO₂ at 273 K indicating that some microporosity is already present in the unactivated fiber. These micropores are, however, unaccessible to N₂ at 77 K. The specific surface area and the micropore volume of carbon fiber were increased significantly upon activation, however after 60% burn-off, the micropore volume measured by D-R equation levels off where as the one determined by the as-method steadily increase with the extent of activation. The adsorption of iodine and the decolorization of methylene blue of activated carbon fiber from aqueous solution were excellent, especially adsorption rate was greatly fast. The adsorption capacity was enhanced with the burn-off increasing, but it was also dependent on micropore size distribution.
채주승,고경렬,정종헌,이보성,유승곤 ( Joo Seung Chae,Kyung Ryeol Ko,Chong Hun Jung,Bo - Sung Rhee,Seung Kon Ryu ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.1
Hollow carbon fiber was prepared from petroleum pitch and activated by steam for the production of new type adsorbent. The hollow activated carbon fibers (HACF) showed 800-2100 ㎡/g of specific surface area. All the adsorption isotherms of HACFs were Type I. The external surface area of 70% burn-off HACF was only about 1.5% of total surface area, which means that the micropore volume is very large. HACFs have excellent iodine adsorption and methylene blue decolorization capacities like an ordinary activated carbon fibers in solution. Especially, it is expected that HACF can be used for the separation of various mixtures as molecular sieves.