Journal of Korean Society of Environmental Engineers (대한환경공학회지)
- Volume 22 Issue 2
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- Pages.203-210
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- 2000
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- 1225-5025(pISSN)
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- 2383-7810(eISSN)
A Study on the Deposition of Chitosan for Enhancing the Adsorption Ability of Activated Carbon
활성탄의 흡착력 향상을 위한 키토산 첨착에 관한 연구
- Ju, Han-Shin (Dept. of Chem. Eng., Sunchon National University) ;
- Kim, Byung-Hoon (RRC Center, Sunchon National University) ;
- Jung, Sang-Chul (Dept. of Environ. Eng., Sunchon National University) ;
- Ra, Deog-Gwan (Dept. of Environ. Eng., Sunchon National University) ;
- Chung, Min-Chul (Dept. of Chemistry, Syracuse University) ;
-
Ahn, Ho-Geun
(Dept. of Chem. Eng., Sunchon National University)
- 주한신 (순천대학교 화학공학과) ;
- 김병훈 (순천대학교 RRC센터) ;
- 정상철 (순천대학교 환경공학과) ;
- 라덕관 (순천대학교 환경공학과) ;
- 정민철 (시라큐스대학 화학과) ;
-
안호근
(순천대학교 화학공학과)
- Received : 1999.08.12
- Accepted : 1999.10.22
- Published : 2000.02.28
Abstract
The preparative methods of a chitosan-deposited activated carbon and its characteristics were studied by using three kinds of chitosan with different degree of deacetylation and average molecular weight. The procedure was consisted of the dissolution of chitosan into acid solution, impregnation of activated carbon, agitation, evaporation, and drying. When the chitosan-dissolved acid and its concentration, amounts of chitosan deposited, and agitation conditions were changed, the specific surface area, deposition state on surface, and stability were investigated, and amounts of Cr(VI) adsorbed was measured. In the preparation process, it was proper to agitate the chitosan-dissolved acetic acid solution at room temperature for 1hr. In the deposition of chitosan with low molecular weight, the specific surface area of activated carbon was greatly decreased even at low chitosan loading, but in the case of high molecular weight it was not nearly changed to 10wt% loading. It was known that chitosan was uniformly and physically deposited on activated carbon. The chitosan-deposited activated carbon was stable into the solution over about pH 6. The removal of Cr(VI) was remarkably enhanced by adding the adsorption function of chitosan to the surface of activated carbon with about 5wt% chitosan. It may be therefore used as an adsorbent for removing the pollutants in air and wastewater.
탈아세틸화도와 평균분자량이 다른 키토산 3종류를 활성탄 표면에 첨착하는 방법과 그 특성에 관하여 연구하였다. 키토산 첨착활성탄은 주로 산 용액에 키토산을 용해시켜 활성탄을 침적한 후, 회전증발기에서 일정시간 교반하여 증발 건조하는 방법으로 제조하였다. 키토산을 용해하는 산 종류 및 농도, 첨착량, 교반조건의 변화에 따른 비표면적 변화, 표면상태 및 안정성을 검토하고, 키토산 첨착활성탄의 Cr(VI) 흡착특성을 조사하였다. 키토산 첨착활성탄의 제조에는 키토산을 초산용액에 용해하여 그 용액에 활성탄을 침적하고 실온에서 1시간 정도의 교반이 적절하였다. 분자량이 작은 키토산은 소량의 첨착으로도 비표면적을 크게 감소시켰고, 큰 분자량의 키토산은 10wt%까지 거의 일정하게 원래 활성탄의 비표면적을 유지하였다. 키토산은 활성탄 표면에 균일하게 물리적으로 첨착되어 있었고, 키토산 첨착활성탄은 약 pH 6 이상의 용액에서 안정하였다. Cr(VI)의 제거율은 활성탄이나 키토산 자체보다 크게 향상되었다. 이는 첨착된 키토산이 활성탄 자체의 흡착력을 향상시킨 것으로 생각되며, 약 5wt% 첨착량에서 키토산과 활성탄의 중금속 흡착기능이 효과적으로 나타남을 알았다.