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화학적으로 표면처리된 활성탄소섬유 디스크에의한 코발트이온의 전기흡착

Electrosorption of Cobalt Ions by Chemically Treated ACF Discs

김한상 유승곤^† 정종헌¹ 박광규²

Han Sang Kim Seung Kon Ryu^† Chong Hun Jung¹ Kwang Kyu Park²

충남대학교 화학공학과, 305-764 대전시 유성구 궁동 220 ¹한국원자력연구소 제염해체 기술연구개발부, 305-353 대전시 유성구 덕진동 150 ²한국전력연구원 원자력 연구실, 305-380 대전시 유성구 문지동 103-16

Department of Chemical Engineering, Chungnam National University, 220, Gung-dong, Yuseong-gu, Daejeon 305-764, Korea ¹Nuclear Chemical Engineering Research Team, Korea Atomic Energy Research Institute, 150, Duckjin-dong, Yuseong-gu, Daejeon 305-353, Korea ²Nuclear Power Laboratoty, Korea Electric Power Research Institute, 103-16, Munji-dong, Yuseong-gu, Daejeon 305-380, Korea

HWAHAK KONGHAK, December 2003, 41(6), 744-748(5), NONE

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Abstract

활성탄소섬유로 디스크를 만들고 NaOH 또는 HNO₃로 처리하여 표면특성을 변화시킨 후 흑연봉에 연결하여 직류전기를 공급하면서 수용액으로부터 코발트이온을 전기흡착시켰다. 활성탄소섬유를 NaOH로 처리하면 미세공의 평균크기와 비표면적은 변화가 없으나 총산도가 감소되었고 HNO₃로 처리하면 미세공의 평균크기는 변화가 없으나 비표면적은 약 20% 감소하고 총산도는 증가하며 특히 carboxyl 그룹이 많이 생성되었다. 약품처리에 의하여 활성탄소섬유의 등전점은 pH 3.1에서 pH 2.6, pH 2.2로 각각 낮아졌고 zeta 전위도 감소하였는데 이것은 표면에 음이온 하전밀도가 증가하였기 때문이다. NaOH처리된 활성탄소섬유 디스크에 의한 코발트이온의 흡착속도는 처리되지 않은 활성탄소섬유에 의한 흡착속도보다 2배 증가하였으나 HNO₃처리 활성탄소섬유는 1/5로 감소하였다. 코발트 이온의 전기흡착능력은 0.2 N NaCl까지는 전해질의 농도에 비례하였으나 전해질의 농도가 더 증가하면 양이온의 경쟁으로 코발트 이온의 흡착속도는 감소하였다.

ACF discs were surface treated using NaOH, HNO₃ and connected to a graphite bar, for the electrosorption of cobalt ions from an aqueous solution. The total acidity of ACF decreased by NaOH treatment which maintaining the same average pore size and specific surface area. The total acidity, specially carboxyl groups, increased by HNO₃ treatment, although the specific surface area was reduced by co. 20%. The Point of Zero Charge (PZC) of ACF decreased from pH 3.1 to 2.6 and 2.2 by HNO₃ and NaOH treatment, as a result of increases in anode ion density on ACF disc surface. Therefore, the adsorption rate of cabalt ion by NaOH treated ACF disc was twice larger than that of non-treated ACF disc, while that of HNO₃ treated ACF disc was only one fifth of the non-treated ACF disc in electrosorption. The electrosorption rate increased with the electrolyte concentration, however, it slowly decreased above 0.2 N NaCl because of competition between Co²⁺ and Na⁺.

Keywords

Activated Carbon Fiber Electrosorption Acidity Co(II)

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