The Preparation of Activated Carbon from Coffee Waste: ZnCl2-Activation

커피폐기물을 이용한 활성탄의 제조: ZnCl2-활성화

  • You, S.H. (Division of Chemical Engineering, Sunmoon University) ;
  • Kim, H.H. (Division of Chemical Engineering, Sunmoon University)
  • 유상희 (선문대학교 공과대학 화학공학부) ;
  • 김학희 (선문대학교 공과대학 화학공학부)
  • Received : 1997.12.24
  • Accepted : 1998.05.18
  • Published : 1998.08.10

Abstract

Activated coffee chars were prepared from coffee waste by chemical activation with zinc chloride. In this study, the following processes were carried out ; roasting step, carbonization step, chemical activation step, and washing and drying step. The roasting step of coffee waste was carried out at $300{\sim}400^{\circ}C$ for 10 minutes. The optimum condition of carbonization was at $650^{\circ}C$ for 1 hour. The most important parameter in chemical activation of coffee char was found to be the chemical ratio of activation agents. Activated coffee chars prepared by various activation methods were characterized in terms of the nitrogen BET surface area, the BJH pore volume and pore size distribution at 77 K. The $N_2$-BET surface areas and total pore volume of coffee chars prepared by the chemical activation with $ZnCl_2$ were determined as about $1110{\sim}1580m^2/g$ and $0.51{\sim}0.81cm^3/g$, respectively. Scanning Electron Microscopy (SEM) was used to observe the porosity and surface of activated coffee chars. From the results of SEM analysis, it was shown that active surface and many pores were formed after the chemical activation. The preparation of the activated coffee char from coffee waste was successfully carried out, which previews a possibility for exploitation of resources by recycling the waste.

Keywords

Activated Coffee Char;Chemical Activation;BET Surface Area;Chemical Ratio;Pore

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