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유바라즈할도라이,Dian Kharismadewi,Dirk Tuma,심재진 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
Chitosan (CS)/iron oxide (Fe3O4) composites were prepared using a chemical precipitation method. The CS/Fe3O4 composite was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and zeta-potential measurements. The composite was used to remove methyl orange (MO) dye from an aqueous solution. The factors affecting the adsorption capacity, such as adsorption time, absorbent dosage and solution pH were investigated. The results suggested that the composite was an effective adsorbent for the removal of MO dye from its aqueous solution. Kinetics studies showed that the adsorption process was consistent with a pseudo-second- order model. The adsorbent efficiency was unaltered, even after five cycles of reuse, and the adsorbent could be recollected easily using a magnet. In addition, the composite exhibited a superior antibacterial efficacy against Escherichia coli; 82% within 24 h, as measured by the colony forming units.
Zong, Tongqiang,Kharismadewi, Dian,Ra, Choon-Sup,Shim, Jae-Jin The Korean Society of Clean Technology 2012 청정기술 Vol.18 No.1
상업적으로 이용 가능한 과산화초산을 산화제로 사용하고, 적은 양으로 매우 빠르게 산화시킬 수 있는 효율적인 철복합체 $[((phen){_2}(H_2O)Fe^{III}){_2}({\mu}-O)](ClO_4){_4}$ 촉매를 사용하여 $-10^{\circ}C$에서 1,3-부타다이엔을 에폭시화하였다. 에폭시화반응에 대한 온도(-10 ~ $-40^{\circ}C$)와 시간의 효과에 관하여 연구하였다. 에폭시화반응은 $-20^{\circ}C$에서 약 5분 내에 거의 완결될 정도로 빨랐으나, 그 이하의 온도에서는 느려졌다. 부타다이엔의 수율은 반응시간에 따라 증가하였으며, 부타다이엔 양이 증가하면 수율도 증가하는 경향을 보였다. 실험에서 얻은 부타다이엔모노에폭사이드의 최고 수율은 90%였다. Here, we report an efficient iron complex $[((phen){_2}(H_2O)Fe^{III}){_2}({\mu}-O)](ClO_4){_4}$, that can rapidly epoxidize 1,3-butadiene at $-10^{\circ}C$ with low catalyst loadings by using commercially available peracetic acid as an oxidant. The main aspect of our study is to investigate the effect of temperature (from -10 to $-40^{\circ}C$) and time on the epoxidation reaction. The epoxidation reaction was fast and almost completed within 5 min at temperatures above $-20^{\circ}C$, whereas it became slow at temperatures below $-20^{\circ}C$. The yield of butadiene monoepoxide (BMO)increased with increasing the reaction time. Generally, when the more butadiene was used, the higher yield was obtained. The highest yield of BMO was 90%.
Tongqiang Zong,Dian Kharismadewi,Choon Sup Ra,Jae-Jin Shim 한국청정기술학회 2012 청정기술 Vol.18 No.1
상업적으로 이용 가능한 과산화초산을 산화제로 사용하고, 적은 양으로 매우 빠르게 산화시킬 수 있는 효율적인 철복합체 [((phen)₂(H₂O)Fe<SUP>III</SUP>)₂(μ-O)](ClO₄)₄ 촉매를 사용하여 -10 ℃에서 1,3-부타다이엔을 에폭시화하였다. 에폭시화반응에 대한 온도(-10 ~ -40 ℃)와 시간의 효과에 관하여 연구하였다. 에폭시화반응은 -20 ℃에서 약 5분 내에 거의 완결될 정도로 빨랐으나, 그 이하의 온도에서는 느려졌다. 부타다이엔의 수율은 반응시간에 따라 증가하였으며, 부타다이엔 양이 증가하면 수율도 증가하는 경향을 보였다. 실험에서 얻은 부타다이엔모노에폭사이드의 최고 수율은 90%였다. Here, we report an efficient iron complex [((phen)₂(H₂O)Fe<SUP>III</SUP>)₂(μ-O)](ClO₄)₄, that can rapidly epoxidize 1,3-butadiene at -10 ℃ with low catalyst loadings by using commercially available peracetic acid as an oxidant. The main aspect of our study is to investigate the effect of temperature (from -10 to -40 ℃) and time on the epoxidation reaction. The epoxidation reaction was fast and almost completed within 5 min at temperatures above -20 ℃, whereas it became slow at temperatures below -20 ℃. The yield of butadiene monoepoxide (BMO)increased with increasing the reaction time. Generally, when the more butadiene was used, the higher yield was obtained. The highest yield of BMO was 90%.