• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 봄 학술발표회 논문집
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• pp.309-310
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• 2003

활성탄소 (activated carbons, ACs)는 넓은 비표면적을 가지고 있어 흡착용량이 크며, 발달된 미세공을 가지고 있기 때문에 오염물질의 제거능력이 높을 뿐만 아니라 경제적, 환경 친화적인 측면에서도 유리하다. 특히 섬유화된 할성탄소섬유 (activated carbon fibers, ACFs)는 균일한 세공이 표면에 노출되어 있어 흡착속도가 빠르며, 안정성과 재생성이 좋고 섬유상이기 때문에 가공이 용이하며 직포, 부직포, 시트 등의 형태로 만들어져 용매회수, 공업제품의 정제, 오폐수의 처리시설, 소각시설의 유해 배기가스의 흡착등에 널리 사용되고 있다.[1,2] (중략)

• Composites Research
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• 제29권5호
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• pp.256-261
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• 2016

본 연구에서는 습식공정을 이용한 Pitch계 활성탄소섬유와 바인더 섬유를 이용하여 필터 페이퍼를 제조하였다. 필터 페이퍼 내 바인더 섬유의 함량이 기공특성에 미치는 영향을 알아보기 위해 77 K에서 질소 흡착 등 온선과 주사 전자 현미경을 통해 흡착특성을 비교 분석하였다. Pitch계 활성탄소섬유와 바인더 섬유와의 최적 비율은 70:30 비율로 가장 균일한 기공 및 결합력이 좋은 페이퍼의 모습을 보였으며, 바인더 섬유의 함량이 적을수록 높은 비표면적 값을 확인하였다. Pitch계 활성탄소섬유와 바인더 섬유의 종류와는 상관없이 70:30 비율에서 최적의 페이퍼가 제조되었으며, $650.4m^2/g$의 비표면적 값과 86.9%의 유해가스 제거율을 확인하였다. 또한 필터 페이퍼의 평균 기공 크기 분포는 바인더 섬유의 영향을 받지 않는 것으로 관찰되었다.

• Bulletin of the Korean Chemical Society
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• 제26권12호
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• pp.2089-2092
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• 2005

• Carbon letters
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• 제5권4호
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• pp.186-190
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• 2004

In this work, a nickel metal (Ni) electroplating on the activated carbon fiber (Ni/ACFs) surfaces was carried out to remove the toxic hydrogen chloride (HCl) gas. The surface properties of the treated ACFs were determined by using nitrogen adsorption isotherms at 77 K, SEM, and X-ray diffraction (XRD) measurements. HCl removal efficiency was confirmed by a gas-detecting tube technique. As a result, the nickel metal contents on the ACF surfaces were increased with increasing the plating time. And, it was found that the specific surface area or the micropore volume of the ACFs studied was slightly decreased as increasing the plating time. Whereas, it was revealed that the HCl removal efficiency containing nickel metal showed higher efficiency values than that of untreated ACFs. These results indicated that the presence of nickel metal on the ACF surfaces played an important role in improving the HCl removal over the Ni/ACFs, due to the catalytic reactions between nickel and chlorine.

• 공업화학
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• 제29권3호
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• pp.318-324
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• 2018

본 연구에서는 물리적 활성화법인 수증기 활성화법을 이용하여 PAN (Polyacrylonitrile)계 활성탄소섬유를 제조하였다. 활성화는 온도와 시간을 변수로 하였으며, 활성화 온도(700, 750, $800^{\circ}C$)에 도달하였을 때 200 mL/min의 수증기 유량의 조건으로 PAN 탄소섬유의 활성화를 진행하였다. 제조된 활성탄소섬유의 기공구조를 분석하기 위하여 질소가스의 흡 탈 등온선을 통한 비표면적($S_{BET}$) 측정과 표면분석을 위한 AFM 분석을 실시하였다. 또한 인장시험을 실시하여 활성화 결과 형성된 기공구조가 섬유의 기계적 특성에 미치는 영향을 고찰하였다. 그 결과, 활성화 후 섬유의 비표면적($S_{BET}$)은 $448{\sim}902m^2/g$의 값을 나타냈으며, 인장강도는 58.16~84.92%, 탄성계수는 69.81~83.89%의 감소를 보였다.

• 공업화학
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• 제30권6호
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• pp.719-725
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• 2019

본 실험에서는 활성탄소섬유에 산소플라즈마 처리를 실시하여 산소작용기 도입 함량에 따른 유독성 화학작용제의 모사 가스인 dimethyl methylphosphonate (DMMP) 감응특성에 대하여 고찰하였다. 산소플라즈마 처리 유량이 증가할수록 활성탄소섬유 표면에 산소가 6.90%에서 최대 36.6%까지 도입되어 DMMP 가스 감응특성에 영향을 미치는 -OH가 증가하였다. 그러나 유량이 증가할수록 산소플라즈마 처리 시 발생한 산소 활성종으로 인하여 활성탄소섬유 표면에 식각이 발생하여 비표면적은 감소하는 경향을 보였다. DMMP 가스센서의 저항변화율은 산소플라즈마 처리 유량이 증가함에 따라 4.2%에서 최대 25.1%까지 증가하였다. 이는 산소플라즈마 처리로 인하여 활성탄소섬유에 발달된 -OH와 DMMP 가스의 수소결합으로 인한 것이라 여겨진다. 따라서 산소플라즈마 처리는 상온에서 유독성화학작용제 가스를 감지하기 위한 중요한 표면처리 방법 중 하나라고 판단된다.

• Carbon letters
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• 제2권1호
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• pp.15-21
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• 2001

In this work, activated carbon fibers (ACFs) were plated with copper metal using electroless plating method and the effects of surface properties and pore structures on chromium adsorption properties were investigated. Surface properties of ACFs have been characterized using pH and acid/base values. BET data with $N_2$ adsorption were used to obtain the structural parameters of ACFs. The electroless copper plating did significantly lead to a decrease in the surface acidity or to an increase in the surface basicity of ACFs. However, all of the samples possessed a well-developed micropore. The adsorption capacity of Cr(III) for the electroless Cu-plated ACFs was higher than that of the as-received, whereas the adsorption capacity of Cr(VI) for the former was lower than that of the latter. The adsorption rate constants ($K_1$, $K_2$, and $K_3$) were also evaluated from chromium adsorption isotherms. It was found that $K_1$ constant for Cr(III) adsorption depended largely on surface basicity. The increase of Cr(III) adsorption and the decrease of Cr(VI) adsorption were attributed to the formation of metal oxides on ACFs, resulting in increasing the surface basicity.

• Carbon letters
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• 제6권1호
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• pp.1-5
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• 2005

Isotropic pitch based carbon fibers were exposed to isothermal oxidation in carbon dioxide gas to study the activation kinetics under the temperature of 800~$1100^{\circ}C$. The kinetic equation $f=1-{\exp}(-at^b)$ was introduced and the constant b was obtained in the range of 0.92~1.25. It was shown that the activated carbon fiber shows the highly specific surface area (SSA) when the constant b comes close to 1. The activation kinetics were evaluated by the reaction-controlling regime (RCR) according to changes of the apparent activation energy with changes of the conversion. It was observed that the activation energies increase from 47.6 to 51.2 kcal/mole with the conversion increasing from 0.2 to 0.8. It was found that the pores of the activated carbon fiber under the chemical reaction were developed well through the fiber.

• Bulletin of the Korean Chemical Society
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• 제30권9호
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• pp.1967-1972
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• 2009

The electrospinnability of pitch was improved by blending in a solution of polyacrylonitrile (PAN) resulting in the reduction of the average fiber diameter from 2000 to 750 nm. Activated carbon fibers (ACFs) derived by stabilization, carbonization and steam activation at 700, 800, and 900 ${^{\circ}C}$ of the PAN/pitch electrospun fibers for 60 min were investigated as electrodes for supercapacitors. The Brunauer, Emmett, Teller (BET) specific surface area ranged from 732 to 1877 $m^2g^{-1}$ and the specific capacitance from 75.5 to 143.5 $Fg^{-1}$, depending on the activation conditions. Electrodes from the electrospun web activated at 900 ${^{\circ}C}$ exhibited a particularly quick response showing a high frequency of 5.5 Hz at a phase angle of ‒$45^o$ of the impedance spectroscopy.

• Carbon letters
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• 제1권2호
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• pp.69-75
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• 2000

Naphtha cracking bottom oil was reformed with heat treatment and then spun at $310^{\circ}C$. These pitch-based carbon fibers were carbonized at $1000^{\circ}C$ after oxidation at $280^{\circ}C$, for 90 min. These fibers were chemically activated with molar ratio of KOH/CF (1 : 1) at different temperatures ($250{\sim}900^{\circ}C$) for 1 hr. The process of activation was characterized with DTA, TGA, BET surface area and pore size distribution. The activation of fibers by KOH was performed by several process. One is the reduction process that carbon fiber was reacted with $K_2O$ produced from dehydration process above $400^{\circ}C$. The other is the process that $K_2CO_3$ was directly reacted with carbon fiber. At $800^{\circ}C$, the activation was performed by catalyzed mechanism that $K_2O$ was obtained from the reaction of metal potassium with $CO_2$, then was changed to $K_2CO_3$. At $870^{\circ}C$, the activation was also observed that activation mechanism was promoted by metal catalyst with $CO_2$ from decomposition of $K_2CO_3$. The specific surface area of prepared activated carbon fibers was dependent on the activation mechanism. The specific surface area was in the range of $1519{\sim}2000\;cm^3/g$ and was the largest prepared at $870^{\circ}C$. The pores developed were mostly micropores which was very narrow and uniform. The total pore volume was $0.58{\sim}0.77\;cm^3/g$.