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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.
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.
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.