Characteristics of Chlorinated VOCs Adsorption over Thermally Treated Silica Gel

열처리 실리카겔의 염소계 휘발성 유기화합물 흡착특성 연구

  • Nam, Kyung Soo (Department of Environmental Engineering, Kwangwoon University) ;
  • Kwon, Sang Soog (Department of Environmental Engineering, Kwangwoon University) ;
  • Yoo, Kyung Seun (Department of Environmental Engineering, Kwangwoon University)
  • 남경수 (광운대학교 환경공학과) ;
  • 권상숙 (광운대학교 환경공학과) ;
  • 유경선 (광운대학교 환경공학과)
  • Received : 2007.02.28
  • Accepted : 2007.04.26
  • Published : 2007.06.10

Abstract

Adsorption characteristics of 1,2-dichlorobenzene on the surface of heat treated silica gel were determined by the moment analysis. The heat treatment of the silica gel was performed at temperatures of 150, 500, and $800^{\circ}C$ and pulse-response of 1,2-dichlorobenzene was measured in a gas chromatograph equipped with thermal conductivity detector (TCD) using the packed column. Equilibrium adsorption constants and isosteric heat of adsorption were recorded the highest value at $500^{\circ}C$. This might be due to the increase of interaction between silica surface and 1,2-dichlorobenzene as the decrease of OH concentration and moisture by increase of heating temperature. Axial dispersion coefficient calculated by the moment method was about $0.046{\times}10^{-4}{\sim}1.033{\times}10^{-4}m^2/sec$ and pore diffusivity of heat treated silica gel at $500^{\circ}C$ measured the lowest value. Because heat treating at $800^{\circ}C$ caused the specific surface area to reduce, equilibrium adsorption constants and isosteric heat of adsorption were decreased.

Keywords

adsorption;moment method;silica gel;o-DCB;heat treatment

Acknowledgement

Supported by : 한국과학재단

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