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핏치계 활성탄소섬유 고정탑에서의 크롬(Ⅵ)의 제거
The Removal of Chromium(Ⅵ) in Pitch-based ACF Fixed Bed
HWAHAK KONGHAK, April 1997, 35(2), 162-167(6), NONE
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Abstract
활성탄소섬유와 활성탄소 고정탑을 통한 수용액으로부터의 크롬(Ⅵ)의 흡착량은 활성탄소섬유와 활성탄의 비표면적에 비례하였으며 활성탄소섬유가 활성탄소에 비해 1.5배만큼 흡착속도가 빨랐다. 크롬(Ⅵ)이 흡착되는 동안 유출액의 pH는 수산화이온(OH)의 발생에 의해 증가하였다. 10-3M이하의 농도에서는 흡착이 잘 되었으나 크롬(Ⅵ)의 농도가 증가할수록 흡착제와 친화력이 약한 Cr2O72-이 HCrO4-보다 증가하여 유출액의 상대농도값이 초기에 증가하는 현상이 나타났다. 유속이 빠를수록 입자 주위의 경막저항이 감소하여 흡착속도가 증가하였으나 흡착량은 일정하였다. 농도 prolfile이 정형분포를 형성하기 위한 최소 길이는 미사용층의 길이와 거의 일치하였다.
The amount of Cr(Ⅵ) adsorbed from aqueous solution in AC and ACF packed column was in proportion to specific surface area of AC and ACF, and the adsorption rate of ACF was 1.5 times faster than that of AC. Owing to release of OH-, the pH of solution was increased during adsorption of Cr(Ⅵ). The adsorption of Cr(Ⅵ) was well performed under 10-3M concentration. However, as the concentration increase, the effluent concentration was suddenly increased in the beginning of flow, which was due to the increase of molar ratio of Cr2O72- to HCrO4. Although the adsorption rate was increased in higher flow rate because of decreasing in film resistance, the amount adsorbed was constant. The minimum bed length for constant pattern was coincided with the length of unused bed.
Keywords
References
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Coulson JM, Richardson JF, "Chem. Eng.," 2nd ed., Pergamon Press, Oxford, New York (1979)
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Ruthven DM, "Principles of Adsorption and Adsorption Process," John Wiley & Sons, U.S.A. (1984)
