Korean Chemical Engineering Research, Vol.42, No.5, 551-557, October, 2004
질산 및 황산으로 표면처리된 활성탄소섬유의 Propylamine 흡착특성
Propylamine Adsorption Characteristics of Surface-treated Activated Carbon Fibers with Nitric Acid and Sulfuric acid
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초록
1 M 질산 및 1 M 황산으로 표면 처리된 레이욘계 활성탄소섬유(KF-1500)의 세공구조와 표면관능기를 분석하였으며 이들에 대한 propylamine의 흡착특성을 연구하였다. 끓는점에서 처리된 활성탄소섬유의 비표면적(SBET)과 총세공부피(Vt)는 5-8% 감소하였으나 총표면산도는 크게 증가하였다. 질산 처리된 활성탄소섬유의 총표면산도는 처리되지 않은 것에 비하여 약 10배나 증가하였고, 황산처리에 비하여는 3.3배 증가하였으며 특히 carboxylic기와 phenolic기의 증가량이 컸다. 상대압력 1.0에서 질산처리 활성탄소섬유의 propylamine 흡착량은 350 mg/g-ACF 정도로써 처리되지 않은 것에 비하여 약 17%증가하였으며, 평형에서의 등온흡착은 Freundlich식과 잘 일치하였다. 질산 처리된 활성탄소섬유의 propylamine 흡착능이 월등하게 증가한 것은 carboxylic기와 phenolic기가 크게 증가했기 때문이다.
The surface of rayon-based activated carbon fiber (ACF, KF-1500) was treated by 1 M HNO3 and 1 M H2SO4. Structural properties and surface functional groups of the ACFs were analyzed and prophylamine adsorption characteristics of the ACFs were also investigated. The specific surface area and total pore volume of ACFs decreased about 5-8 wt% by acidic treatment at boiling point, while total surface acidity highly increased. The total surface acidity of nitric acid treated ACF was 10 times larger than that of non-treated ACF and 3.3 times larger than that of sulfuric acid treated ACF. Especially, carboxylic and phenolic groups of ACF were much developed by nitric acid treatment. The propylamine adsorption amount of ACF treated by nitric acid was 350 mg/g-ACF at relative pressure of 1.0 and increased 17% more than that of non-treated ACF. Also, the equilibrium adsorption isotherm was well fitted to Freundlich equation. This remarkable increase on propylamine adsorption capacity of nitric acid treated ACF was due to the large increase of carboxylic and phenolic groups on the surface.
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