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메모포러스 실리카의 기공특성에 따른 중금속 흡착능의 변화

Effects of the Pore Properties of Mesoporous Silica on the Metal Adsorption Capacities

김영훈 이병환 조영성 이종협^†

Younghun Kim Byunghwan Lee Young Sung Cho Jongheop Yi^†

서울대학교 공과대학 응용화학부, 서울 151-742

School of Chem. Eng., Seoul National University, Seoul 151-742, Korea

HWAHAK KONGHAK, April 2001, 39(2), 228-236(9), NONE

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Abstract

구조유도체로 알킬 아밀과 삼중 혼성중합체를 이용하여 수은이온에 대하여 선택적인 흡착을 보이는 메조포러스 실리카(HMSs, SBAs)를 제조하여 결정성과 기능기의 밀도에 따른 금속의 흡착효과를 파악하였다. 지지체의 기공크기가 2.8nm 이하인 경우에는 기능기 부착과정에서의 기공의 구조적 장애가 일어나지만, 기공크기가 3nm 이상인 경우에는 기공의 구조적 장애 정도가 유사하여 지지체 기공크기에 대한 기능기 부착후의 흡착제의 mercapto 밀도와의 상관성은 감소하였다. 지지체에 대한 XRD와 원소분석 결과와 Scherrer 식으로부터 계산된 지지체의 결정크기와 기공의 균일성이 흡착제에 함유된 기능기의 농도를 결정하는 주요인자임을 확인하였다. 단일 금속이온에 관한 흡착 실험결과, mercapto 그룹에 관한 친화도는 수은이 가장 우수하였으며 mercapto 함유량에 비례하였다. 수은과 구리의 복합상에서는 수은이 구리보다 약 29배 정도 많은 흡착능을 보였다.

A series of chemically active mesoporous silicas(HMSs and SBAs), which show selective adsorption properties for Hg(II) ion, has been synthesized using primary amines and poly(alkylene oxide) triblock copolymer as a structure-directing agent. This study investigated the effects of crystallinity and surface properties on the mercapto densities and the metal adsorption capacities. The steric effect of functional groups was observed in the supports with the pore diameters less than 2.8 nm, while no close correlations between the pore diameters of supports and mercapto densities of the adsorbents were observed in those with the pore diameters greater than 3 nm. The results of XRD and elemental analysis show that the pore uniformity and the crystallite domain size of the supports, which were calculated by Scherrer formula, plays a key role in the determination of the extent of the mercapto densities of the adsorbents. The adsorbents showed high selectivity to the adsorption of mercury ions in a single metal solution among others under the given conditions.

Keywords

Mesoporous Silica Crystallite Size Removal of the Heavy Metal Ion Adsorbents

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