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  • 02월 20일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제113회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Zeolites and the environmental issues

2014년 2월 25일 09시 17분 38초
INOR1-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 09시 : 40분
무기화학 - Past, Present and Future of Inorganic Chemistry in Korea
저자 및
서강대학교 화학과, Korea
Zeolites represent a large class of nanoporous crystalline inorganic materials whose frameworks consist of Si, Ge, Al, P, Ga, and many transition metals such as Ti, V, Co, Mn, Fe. The nanopores are often called cages or channels, depending on the shape of the pores, and they are normally filled with charge-balancing cations and water. Among various classes of zeolites, aluminosilicate zeolites have been most widely studied and applied in various fields. The framework of an aluminosilicate zeolite is formed by three-dimensional networking of [AlO4]5? and [SiO4]4? tetrahedra via bridging oxygen atoms. As each aluminum atom has an excess negative charge, charge-compensating cations must be introduced into the structure, and they exist in the nanopores. Na+ is the most common charge-balancing cation. The charge-balancing cations can be readily substituted with a variety of other cations via conventional aqueous ion exchange. By this way, various metal ions can be introduced into the zeolites. Protons (H+) are also frequently exchanged into zeolites. So far, zeolites have been widely used catalysts, sorbents, ion exchangers, molecular sieve membranes, hosts for naked submicron quantum dots, hosts for nonlinear optical materials, building blocks for organized microcrystals, and so on. In this talk, our efforts to apply zeolites to remediate the contaminated environment will be presented. These efforts include the effective capture of the radioactive iodine molecules, radioactive Cs+ and various heavy metal ions such as Hg2+, Pb2+, Cd2+, Zn2+, Cr3+, and Tl+. Also included will be the effective capture of CO2 and NO by zeolites, and many others.