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        검색결과 4

        1.
        2022.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In this study, UiO-66-NH2 was synthesized and incorporated with graphene aerosol (UiO-66-NH2/GA) and ethylenediamine functionalized graphene oxide (UiO-66-NH2/GO-NH2). These composites were characterized using infrared spectroscopy, powder X-ray diffraction, ultraviolet–visible light spectroscopy, scanning electron microscope, and energy-dispersive X-ray spectroscopy. UiO-66-NH2/GO-NH2 exhibited 93% adsorption of quinoline in 5 h, UiO-66-NH2 and UiO-66-NH2/GA presented 80.4% and 86.5%, respectively. The high adsorption observed on UiO-66-NH2/GO-NH2 was attributed to the unique electronic properties, and hydrogen bonding between the nitrogen atom of quinoline and NH2- phenyl fragment of UiO-66-NH2, and N–H of ethylenediamine. GO also offered combined strong π–π interactions on its surface, and the oxygen coverage (~ 50%) on GO within the structure is responsible for the formation of strong hydrogen bonds with quinoline. Theoretical calculation suggested that UiO-66-NH2/GO-NH2 presented a more favourable adsorption energy (− 18.584 kcal/ mol) compared to UiO-66-NH2 (− 16.549 kcal/mol) and UiO-66-NH2/GA (− 13.991 kcal/mol). These results indicate that nanocomposites have a potential application in quinoline capture technologies in the process of adsorptive denitrogenation.
        4,600원
        2.
        2010.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The method for the determination of ethylenediamine (EDA) and hexamethylenediamine (HMDA) in food simulants was developed, and migration amounts of these compounds was monitored for 124 polyamide (PA) utensils. The diurethane derivatives of EDA and HMDA, which produced by reaction with ethyl chloroformate,were analyzed by using gas chromatograph (GC)/flame ionization detector (FID) and GC/mass spectrometer (MS). The developed method was validated with 0.3 μg/mL of limit of detection (LOD) for EDA and 0.1 μg/mL of LOD for HMDA, > 0.999 of linearity(r2) and > 88% of recovery. The EDA was detected 1.31 and 2.06 μg/mL for 2samples in water. The HMDA was detected 0.29 - 0.93 μg/mL for 3 samples in 20% ethanol and 0.26 - 0.44 μg/mL for 10 samples in n-heptane. These migration levels were below the specific migration limits (SML) of 12 μg/mL and 2.4 μg/mL for EDA and HMDA established in EU.
        4,000원
        3.
        2004.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The polymer with contents of C60 up to 57 wt.% was produced by mutual condensation of fullerene C60 and ethylenediamine. The investigations of this polymer as well as pristine fullerene to comparison were carried out by FT-IR and UV-Vis spectroscopy, ToF-SIMS, TGA, and elemental analysis. At least three kinds of components was revealed as building blocks of polymer. The fullerene cage underwent only distortion but didn't destroy during formation of polymer. The pure fullerene was found as an intermediate of the thermal decomposition of polymer. The conclusion that this polymer could serve as precursor to produce carbon nanomaterial with high concentration curved graphene sheets and can be used for gas adsorption and electrochemical application was made.
        4,000원
        4.
        2012.06 KCI 등재 서비스 종료(열람 제한)
        Adsorption experiment of carbon dioxide was performed on MCM41 silica with a 30 wt .% EDA(ethylenediamine) loading at different CO2 inlet concentration and various adsorption temperature. The surface characteristics of CO2 capturing agent were carried out using BET analysis, X-ray diffraction and FT-IR. The results of BET showed 781 m2/g for MCM41 and 464 m2/g for EDA/MCM41. X-ray diffraction results reveled typical hexagonal pore system. The higher sorption capacity of EDA/MCM41 was about 80 mgco2/gsorbent with 50% CO2 inlet concentration and 303 K adsorption temperature. The isosteric heat of adsorption in 303-353 K ranged from -25.47 to -28.24 KJ/mole for EDA/MCM41, which indicates CO2-EDA/MCM41 interaction with exothermic adsorption process. Finally, the performance of EDA/MCM41 in 10 consecutive sorption-desorption runs was a stable with only a minor drop in its sorption capacity.