화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.5, 494-498, August, 2001
Export Citation
H2SiF6로 제조한 메조포러스 분자체의 표면 Silylation 및 흡착 특성
Surface Silylation and Adsorption Characteristics of Mesoporous Molicular Sieve Synthesized from H2SiF6
정호승, 정순용†, 권오윤1
  • 한국화학연구소 응용화학연구부, 대전 305-600
  • 1여수대학교 화학공학과, 전남 550-749
Ho Seong Jeong, Soon Yong Jeong†, and Oh Yun Kwon1
  • Applied Chemistry and Engineering Division, Korea Research Institute of Chemical Technology, Taejeon 305-600, Korea
  • 1Department of Chemical Engineering, Yosu National University, Jeon-Nam 550-749, Korea
E-mail:
초록
H2SiF6로 부터 합성한 메조포러스 분자체 (SiMMS)의 표면을 tetrahydrofuran 용액상에서 trimethylchlorosilane (TMCS)으로 silylation 처리하여 물리화학적 특성과 흡착특성을 살펴보았다. 처리 후 메조기공표면에 silylation된 trimethylsilyl (TMS) 기의 점유율은 63.4%였으며, 비표면적은 854에서 625m(2)/g까지 감소하였다. Silylation된 정도가 높을수록 기공부피와 기공크기가 감소하였으며, 기공크기는 약 5 Å 감소하였다. TMS 처리된 시료의 수분 흡착 량은 처리전 보다 80%까지 감소하였으며, 벤젠의 흡착등온선은 전형적인 단분자막 흡착 거동을 나타내면서 유기물에 대한 높은 친화성을 보여주었다. 결과적으로 표면 처리된 메조포러스 분자체는 습도가 높은 조건에서 VOC(s)와 유기물질을 효과적으로 흡착, 제거할 수 있는 분자체로서 이용될 수 있을 것으로 기대된다.
Mesoporous molecular sieve (SiMMS) synthesised from H2SiF6 was modified by silylation with trimethylchlorosilane (TMCS) in tetrahydrofuran solution. Adsorption and physical characteristics of silylated mesoporous molecular sieve were studied. The surface was covered from 42.3 to 63.5% with trimethylsiyl group (TMS) dependent upon the siylation condition. Surface area before and after the silylation decreased 854 to 625 m(2)/g. Pore size decreased about 5 Å with the increased silylation. The water adsorption decreased up to 80% after the silylation, but benzene adsorption isotherm exhibited a typical monolayer adsorption, resulting in lyophobic property for the silylated sample. In the result, SiMMS modified by the surface silylation can be used for the removal of VOCs by the adsorption in high humidity conditions.
Keywords:mesoporous molecular sieve;adsorption;silylation;MCM-41;surface modification
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