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콜타르피치 기반 활성탄소섬유의 제조 및 특성에 관한 연구. II. 물리적 활성화법에 의한 활성탄소섬유의 구리(II), 니켈(II) 흡착 특성
최보경,윤광의,서민강,박수진,Choi, Bo-Kyung,Yoon, Kwang-Eui,Seo, Min-Kang,Park, Soo-Jin 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2
In this paper, the heavy metal ion adsorption behavior in coal tar pitch-based activated carbon fibers (ACFs) during physical activation is presented. $N_2$ adsorption isotherms at 77 K were examined using Brunauer-Emmett-Teller (BET), Horvath-Kawazoe (H-K), and Barret-Joyner-Halenda (BJH) methods to characterize specific surface area, pore volume, and pore size distribution. The removal of heavy metal ions from ACFs was confirmed by atomic absorption spectroscopy (AAS). Experimental results for the ACFs showed a type I isothermal adsorption curve, which confirmed that the created pores were mostly microporous. After a 40-min steam activation, the fibers showed a high specific surface area of $1,693m^2/g$. In addition, all heavy metal ions in the ACFs were adsorbed after about 20 min, and the adsorption reached equilibrium within 1 h. It was found that the adsorption capacity of the ACFs was improved by the presence of micropores but was also dependent on the specific surface area of the ACF.
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콜타르 기반 등방성 피치 섬유의 산화안정화 공정에 대한 오존 처리 영향
양재연,고재경,윤광의,서민강,Yang, Jae-Yeon,Ko, Jae-Kyoung,Yoon, Kwang-Eui,Seo, Min-Kang 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.5
In this work, we performed ozone treatment of isotropic pitch fibers to optimize the duration and temperature during the stabilization process. The treatment worked effectively for long-term and high-temperature stabilization. The isotropic pitch fibers were ozone-treated at different ozone concentrations of 10, 20, and 30 mg/l. The surface properties of the isotropic pitch fibers were analyzed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy, while their structural characteristics were examined using X-ray diffraction. The experimental results indicated that the surface oxygen functional groups (COOH, OH, and CO) and oxygen concentration of the pitch fibers increased after the ozone treatment. During the oxidative stabilization process, the cross-linking reactions of the oxygen functional groups formed the thermosetting pitch, as confirmed by the replacement of hydrogen with oxygen. Additionally, it was observed that the ozone treatment could improve the optimized oxidative stabilization procedure in carbon fiber manufacturing. Therefore, the ozone treatment played an important role in optimizing the oxidative stabilization procedure of the pitch fibers.
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콜타르 피치 기반 활성탄소섬유의 제조 및 특성에 관한 연구(I) -수증기 활성화온도가 활성탄소섬유 형태학적 특성에 미치는 영향-
최보경,곽이구,윤광의,서민강,박수진,Choi, Bo-Kyung,Kwac, Lee-Ku,Yoon, Kwang-Eui,Seo, Min-Kang,Park, Soo-Jin 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.4
In this paper, the effect of the temperature of steam activation on textural properties of coal tar pitch-based activated carbon fibers (ACFs) was studied. Surface properties of the ACFs were determined by using scanning electron microscope (SEM) and X-ray diffraction (XRD). $N_2$ adsorption isotherms at 77 K were investigated by BET and BJH methods to characterize specific surface areas, pore volumes, and pore size distributions. The adsorption isotherms of the ACFs were constructed and analyzed to be of Type I, mainly consisting of micropores. The specific surface areas of the ACFs were increased with activation time and showed a maximum value of $2442m^2/g$ at an activation temperature and time of $900^{\circ}C$ and 40 min, respectively.
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김정현(Jeong-Hyeon Kim),최수경(Soo-Kyong Choi),유영산(Yung-San Yu),윤광서(Kwang-Seo Yoon),서정숙(Jung-Sook Seo) 한국식품과학회 2012 한국식품과학회지 Vol.44 No.6
본 연구에서는 포도 잎의 품종별, 재배시기별 생리활성 효과를 분석하여 포도 잎의 자원화에 기여할 수 있는 기초자료를 제공하고자 하였다. 사용된 포도 잎은 캠벨얼리와 로자리오비앙코 품종으로 생육단계별로 전엽기, 개화기, 결실기, 착색기 및 성숙기로 분류하여 포도 잎의 생리활성의 차이를 분석하였다. 수분과 조단백질 함량은 생육단계별로 유의적으로 감소하였으나 섬유소의 함량은 시기가 지남에 따라 유의적으로 증가하였다. 총 플라보노이드 함량은 캠벨얼리와 로자리오비앙코 품종 모두에서 전엽기에서 높게 나타났으며, 생육단계가 진행됨에 따라 감소되었다. 총 페놀 함량은 캠벨얼리 품종이 로자리오비앙코 품종에 비해 높은 경향이었다. Hydroxyl radical 소거능은 전엽기에서 가장 높게 나타났으며 생육단계가 지남에 따라 점차 낮은 소거능을 보였다. 포도 잎의 전자공여능은 개화기까지 캠벨얼리 품종이 로자리오비앙코 품종에 비해 높았으며, 총 항산화능은 성숙기를 제외하고는 생육단계별로 캠벨얼리 품종이 로자리오비앙코 품종에 비해 높은 수준을 나타내었다. 본 연구 결과로 미루어 볼 때 특히 개화기 이전의 포도 잎은 폴리페놀 함량이 높으며 강력한 항산화 효능을 가진 것으로 나타나 이 시기의 포도 잎은 건강기능식품의 소재로 산업화하는데 유용한 자원으로 이용될 수 있을 것으로 생각된다. This study was conducted to investigate physiologically active components and antioxidant capacity of grapevine leaves at growth stages. The leaves from two strains of grapevine, ‘Campbell Early’ and ‘Rosario Bianco’, were collected at five different growth stages (leafing, blossom, fruiting, coloring, and maturity). Total flavonoid content was higher in leafing stage than the other stages and gradually decreased during growing. Total phenol content was higher in ‘Campbell Early’ than in ‘Rosario Bianco’. Hydroxyl radical scavenging ability increased in the leafing stage and decreased during growing. The electron donating ability was higher in ‘Campbell Early’ then ‘Rosario Bianco’ until blossom stage. Leaves from ‘Campbell Early’ showed higher total antioxidant capacity than those from ‘Rosario Bianco’. According to the above results, grapevine leaves until the blossom stage would possess strong antioxidant activity by physiologically active components such as polyphenol compounds. Therefore, these results suggest that young grapevine leaves can be used as materials for the development of functional foods.
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