Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Comparison of Surface Characteristics and Adsorption Characteristics of Activated Carbons Changed by Acid and Base Modification

산과 염기의 개질에 의해 변화된 활성탄의 표면특성과 흡착특성 비교

  • Lee, Song-Woo (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Lee, Min-Gyu (Division of Applied Chemical Engineering, Pukyong National University) ;
  • Park, Sang-Bo (Division of Applied Chemical Engineering, Pukyong National University)
  • 이송우 (부경대학교 응용화학공학부) ;
  • 이민규 (부경대학교 응용화학공학부) ;
  • 박상보 (부경대학교 응용화학공학부)
  • Published : 2008.05.30
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Abstract

The surface properties of activated carbon modified by acids and base were studied. The influence of the surface chemistry on the adsorption of benzene and acetone vapor on modified activated carbons has been investigated The modified activated carbons were obtained by treatment with acetic acid ($CH_3COOH$), nitric acid ($HNO_3$) and sodium hydroxide (NaOH). The modified activated carbons had similar porosity but different surface chemistry and adsorption characteristics. The total surface acidity (sum of functional groups) of activated carbon (AC-AN) treated by nitric acid was 2.6 times larger than that of activated carbon (AC) before the acid treatment. Especially, carboxyl group was much developed by nitric acid treatment. The benzene equilibrium adsorption capacity of AC-AN decreased 20% more than that of AC. However, the acetone equilibrium adsorption capacity of AC-AN increased 20% more than that of AC because of the large increase of carboxyl group and acidity.

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