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전훈기,최승대,전상권,박근우,양진영,김건중 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.5
A route to synthesize porous materials with a hierarchical micro/meso/macroscopic pore system was investigated. Meso/macroporous monolithic silica foams with a large pore size could be fabricated from a mixture of monodispersed PMMA beads and SBA-15, -16 sol solutions. The size, bulk shape and density of the mesoporous monolithic foam could be controlled by the container and the heat treatment temperature. Drying at temperatures higher than 300 °C resulted in an expansion of the SBA silica sol and its solidification to form the mesoporous foams. In contrast, only a dense silica monolith was obtained after full evaporation of the solvent at room temperature without releasing the foam structure in the monolithic body. A large fraction of macroporosity in three dimensions was formed in the monolith body, and the remaining silica walls exhibited uniform mesoporosity. Hydrolytic and phenolic ring-opening of epoxides were performed successfully using chiral (salen)Co-BF3 complex-immobilized catalysts in the packed bed of a continuous flow system. Very high catalytic activity with desirable enantioselectivity was obtained in asymmetric catalysis.
김영규 ( Young-kyu Kim ),진성현 ( Seung-hyun Jin ),최승대 ( Seung-dae Choi ),이경동 ( Gyeong-dong Lee ),라덕관 ( Deog-gwan Ra ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.3
유류에 오염된 토양을 복원하는데 기초자료를 구축하기 위하여 유류에 오염된 토양에 EM을 첨가한 경우와 EM 발효과정에서의 유류 탈리 및 분해효과에 대하여 검토하였다. 유류에 오염된 토양이 7일 경과 후 자연휘발에 의한 유류 감소분은 21.2%, EM을 10% 주입한 경우에는 53.3%의 감소율을 나타내었다. 또한 0.1%의 EM 첨가만으로도 40%정도의 유류 감소율을 나타내었다. 더욱이 EM 첨가량이 10%인 경우 유류 분해율은 수층에서 3일 경과 후에 40%, 토층에서 30%의 증가를 나타내었다. EM 발효에 의한 유분제거 기작에 있어서 탄소원 감소에 의한 효과와 유분 용해 및 분산을 통한 자연휘발의 효과로 규정하기에는 어려움이 있으나, EM의 첨가가 유분제거 효과를 증대시키고 있음을 알 수 있었다. In order to provide a data base of remediation technology for oil contaminated soil, several effects, oil release, oil decomposing, through the two types examinations were carried out; adding the EM(Effective microorganisms) fermentation liquid to oil contaminated soil and EM fermentation with oil. On the oil contaminated soil, 21.2% oil was decreased by only evaporation phenomenon during the 7 days. By contact with 10% EM liquid, oil was reduced to 53.3%. Additionally, on the case of 0.1% EM contacting to oil contaminated soil, oil decreasing rate was able to get about 40%. When EM was contacted with contaminated soil on 10%, oil decomposing rate were accomplished to 40 % on overlying water, 30% on sediment after 3 days, individually. During the examination of EM fermentation including oil, even though it was difficult to determinate the oil reduction mechanisms: carbon consumption by microbes, hydrolysis or desolation of oil and natural volatilization, it was known that EM liquid was effected to reduce the oil from oil contaminated soil.